CVE-2026-17544
published 2026-07-30CVE-2026-17544: 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…
PriorityP356critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.43%
35.8th percentile
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
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | php8.4 | — | — |
| php | php | — | — |
| php | php | >= 8.4.0 < 8.4.24 | 8.4.24 |
| php | php | >= 8.5.0 < 8.5.9 | 8.5.9 |
| php_group | php | >= 8.4.* < 8.4.24 | 8.4.24 |
| php_group | php | >= 8.5.* < 8.5.9 | 8.5.9 |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv4.08.1HIGHCVSS: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
vendor_redhat9.8CRITICAL
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Bugzilla
CVE-2026-17544 php: PHP: Arbitrary code execution via out-of-bounds write in bccomp() [fedora-all]
bugzilla·2026-08-05·CVSS 9.8
CVE-2026-17544 [CRITICAL] CVE-2026-17544 php: PHP: Arbitrary code execution via out-of-bounds write in bccomp() [fedora-all]
CVE-2026-17544 php: PHP: Arbitrary code execution via out-of-bounds write in bccomp() [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Discussion:
PHP 8.5.9 already in F44 stable
---
FEDORA-2026-d755ca77c4 (php-8.4.24-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-d755ca77c4
Bugzilla
CVE-2026-17544 php: PHP: Arbitrary code execution via out-of-bounds write in bccomp()
bugzilla·2026-07-30·CVSS 9.8
CVE-2026-17544 [CRITICAL] CVE-2026-17544 php: PHP: Arbitrary code execution via out-of-bounds write in bccomp()
CVE-2026-17544 php: PHP: Arbitrary code execution via out-of-bounds write in bccomp()
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.
Discussion:
Notice: Versions < 8.4 are not affected
2026-07-30
Published