by Kastro
Paper/Archive/CVE-2026-17544

CVE-2026-17544

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

EPSS 0.4%CVSS 9.8
critical.is priorityof 100
37
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 36.0.360 × 207.2No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
PHP8.4.* – < 8.4.248.4.24CNA
PHP8.5.* – < 8.5.98.5.9CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
php (CNA)8.1CVSS: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/AU:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

advisorygithub.com/php/php-src/security/advisories/GHSA-x692-q9x7-8c3f