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Fencer Vulns
critical 9.8

CVE-2026-17544 in the critical feed json

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

published 2026-07-30 3 mo ago modified 2026-10-23 16 d ago also BIT-libphp-2026-17544 , BIT-php-2026-17544 , BIT-php-min-2026-17544 , EUVD-2026-51091 , GHSA-x692-q9x7-8c3f

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 36%
public exploits
0
none known

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.

Patch / fix

  • bitnami libphp 8.4.24, 8.5.9
  • bitnami php 8.4.24, 8.5.9
  • bitnami php-min 8.4.24, 8.5.9
  • PHP Group PHP 8.4.24, 8.5.9
  • php8.4 Debian 13 8.4.24-1~deb13u1
  • php8.4 Debian 14 8.4.24-1

debian advisories DEBIAN-CVE-2026-17544

  • php8.5 Ubuntu 26.04 LTS 8.5.4-0ubuntu1.3

ubuntu advisories UBUNTU-CVE-2026-17544

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • php8.4 RHEL 10.2 8.4.24-1.el10_2
  • php8.4-gd RHEL 10.2 8.4.24-1.el10_2
  • php8.4-cli RHEL 10.2 8.4.24-1.el10_2
  • php8.4-dba RHEL 10.2 8.4.24-1.el10_2
  • php8.4-dbg RHEL 10.2 8.4.24-1.el10_2
  • php8.4-ffi RHEL 10.2 8.4.24-1.el10_2
  • php8.4-fpm RHEL 10.2 8.4.24-1.el10_2
  • php8.4-gmp RHEL 10.2 8.4.24-1.el10_2

red hat advisories RHSA-2026:56969RHSA-2026:47200

  • php8 SLE Module for Web and Scripting 15 SP7 8.3.33-150700.3.18.1
  • php8-fpm SLE Module for Web and Scripting 15 SP7 8.3.33-150700.3.18.1
  • php8-test SLE Module for Web and Scripting 15 SP7 8.3.33-150700.3.18.1
  • php8-embed SLE Module for Web and Scripting 15 SP7 8.3.33-150700.3.18.1
  • php8-fastcgi SLE Module for Web and Scripting 15 SP7 8.3.33-150700.3.18.1
  • apache2-mod_php8 SLE Module for Web and Scripting 15 SP7 8.3.33-150700.3.18.1
  • php8 SLES 16.0, SLES for SAP applications 16.0 8.4.24-160000.1.1
  • php8-fpm SLES 16.0, SLES for SAP applications 16.0 8.4.24-160000.1.1

suse advisories SUSE-SU-2026:3509-1SUSE-SU-2026:23121-1SUSE-SU-2026:23144-1

  • php8 openSUSE Leap 16.0 8.4.24-160000.1.1
  • php8-fpm openSUSE Leap 16.0 8.4.24-160000.1.1
  • php8-test openSUSE Leap 16.0 8.4.24-160000.1.1
  • php8-embed openSUSE Leap 16.0 8.4.24-160000.1.1
  • php8-fastcgi openSUSE Leap 16.0 8.4.24-160000.1.1
  • apache2-mod_php8 openSUSE Leap 16.0 8.4.24-160000.1.1
  • php8 openSUSE Tumbleweed 8.5.9-1.1

opensuse advisories openSUSE-SU-2026:21532-1openSUSE-SU-2026:11418-1

  • php8.4 AlmaLinux 10 8.4.24-1.el10_2
  • php8.4-gd AlmaLinux 10 8.4.24-1.el10_2
  • php8.4-cli AlmaLinux 10 8.4.24-1.el10_2
  • php8.4-dba AlmaLinux 10 8.4.24-1.el10_2
  • php8.4-dbg AlmaLinux 10 8.4.24-1.el10_2
  • php8.4-ffi AlmaLinux 10 8.4.24-1.el10_2
  • php8.4-fpm AlmaLinux 10 8.4.24-1.el10_2
  • php8.4-gmp AlmaLinux 10 8.4.24-1.el10_2

almalinux advisories ALSA-2026:56969

  • php8.4 Rocky Linux 10 8.4.24-1.el10_2

rocky linux advisories RLSA-2026:56969

  • php84 Alpine 3.23, Alpine 3.22 8.4.27-r0
  • php84 Alpine 3.24 8.4.24-r0
  • php85 Alpine 3.23 8.5.12-r0
  • php85 Alpine 3.24 8.5.9-r0

alpine advisories ALPINE-CVE-2026-17544

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-17544 updated cvss 8.1

php: PHP: Arbitrary code execution via out-of-bounds write in bccomp()

  • Red Hat Enterprise Linux 6 php, php-gd, php-cli, php-dba, php-fpm, php-pdo, +20 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 10) php8.4 8.4.24-1.el10_2, php8.4-gd 8.4.24-1.el10_2, php8.4-cli 8.4.24-1.el10_2, php8.4-dba 8.4.24-1.el10_2, php8.4-dbg 8.4.24-1.el10_2, php8.4-ffi 8.4.24-1.el10_2, +18 more
    fixed: vendor fix RHSA-2026:56969
  • Red Hat Hardened Images php 8.5.9-1.hum1, php-gd 8.5.9-1.hum1, php-cli 8.5.9-1.hum1, php-dba 8.5.9-1.hum1, php-dbg 8.5.9-1.hum1, php-ffi 8.5.9-1.hum1, +21 more
    fixed: vendor fix RHSA-2026:47200
  • Red Hat Enterprise Linux 7 php, php-gd, php-cli, php-dba, php-fpm, php-pdo, +18 more Red Hat Enterprise Linux 8 php, libzip, php-gd, php-cli, php-dba, php-dbg, +30 more Red Hat Enterprise Linux 9 php, php-gd, php-cli, php-dba, php-dbg, php-ffi, +18 more Red Hat Enterprise Linux 10 php
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
3 mo ago

Exploit prediction

0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.1 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
CNA 4.0 8.1 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
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
OSV 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
bitnami libphp
>=8.4.0, <8.4.24
>=8.5.0, <8.5.9
8.4.24
8.5.9
bitnami php
>=8.4.0, <8.4.24
>=8.5.0, <8.5.9
8.4.24
8.5.9
bitnami php-min
>=8.4.0, <8.4.24
>=8.5.0, <8.5.9
8.4.24
8.5.9

Affected products

  • PHP Group PHP

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of php/php-src published their own advisory on GitHub. Reviewed sources take precedence over it.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.