Out-of-bounds write in bccomp() via crafted operand and scale
41Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 8.1epss 0.4%
from disclosure to weapon13 days
Published on NVDJul 30
1st PoC+13d
exploitation probability
0.4%top 65% of all CVEs
observed exploitation
nono source reports it
2 public exploit(s)
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.
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/AU:N
Affected products
PHP Group · PHPpublic PoCs found — 2
githubgithub.com/Boreas37/CVE-2026-17544-PoC★ 6githubgithub.com/r2qa/CVE-2026-17544★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.