Attacker-provided inputs to bccomp() could lead to an out-of-bounds write with stack and heap corruption in PHP versions from 8.4.* before 8.4.24 and from 8.5.* before 8.5.9.
PoC: CVE-2026-17544-PoC
CVE-2026-17544 — PHP bcmath bccomp() OOB write (stack smashing). Verified: crash on 8.4.23/8.5.8, fixed in 8.4.24. GHSA-x692-q9x7-8c3f
PoC: CVE-2026-17544
CVE-2026-17544: PHP bcmath OOB write → universal memory-only RCE & disable_functions/open_basedir bypass. Offset-free runtime resolver. Verified on PHP 8.4.x / 8.5.x.
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