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CVE-2026-17544

HighPublished

Out-of-bounds write in bccomp() via crafted operand and scale

Published: Jul 30, 2026
Updated: Jul 31, 2026
Assigning CNA: php
Evidence observed: Aug 13, 2026

Primary CVSS

8.1/ 10High

nvd · CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 36.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-17544-PoCPoC
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
CVE-2026-17544Exploit
Exploit for CVE-2026-17544: PHP bcmath OOB write converted into memory-only RCE, bypassing disable_functions and open_basedir with a runtime offset-free resolver.

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