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Fencer Intel
high 7.5

CVE-2026-7263 json

DoS attack via DOMNode::C14N()

published 6mo ago modified last mo. also BIT-libphp-2026-7263 , BIT-php-2026-7263 , BIT-php-min-2026-7263 , EUVD-2026-28981 , GHSA-4jhr-8w89-j733

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 29%
public exploits
0
none known

Summary

In PHP versions 8.4.* before 8.4.21 and 8.5.* before 8.5.6, DOMNode::C14N() method may process the XML data incorrectly, causing a circular linked list in the data structure representing the XML document. This may cause subsequent processing of the XML document to enter infinite loop, causing denial of service in the processing application.

Patch / fix

  • bitnami libphp 8.4.21, 8.5.6
  • bitnami php 8.4.21, 8.5.6
  • bitnami php-min 8.4.21, 8.5.6
  • PHP Group PHP 8.4.21, 8.5.6
  • Red Hat Red Hat Enterprise Linux 10 0:8.4.21-1.el10_2
  • php8.4 Debian 13 8.4.21-1~deb13u1
  • php8.4 Debian 14 8.4.21-1

debian advisories DEBIAN-CVE-2026-7263

  • php8.5 Ubuntu 26.04 LTS 8.5.4-0ubuntu1.1

ubuntu advisories UBUNTU-CVE-2026-7263

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 8.4.21-1.el10_2
  • php8.4-gd RHEL 10.2 8.4.21-1.el10_2
  • php8.4-cli RHEL 10.2 8.4.21-1.el10_2
  • php8.4-dba RHEL 10.2 8.4.21-1.el10_2
  • php8.4-dbg RHEL 10.2 8.4.21-1.el10_2
  • php8.4-ffi RHEL 10.2 8.4.21-1.el10_2
  • php8.4-fpm RHEL 10.2 8.4.21-1.el10_2
  • php8.4-gmp RHEL 10.2 8.4.21-1.el10_2

red hat advisories RHSA-2026:22649

  • php8 openSUSE Tumbleweed 8.5.6-1.1

opensuse advisories openSUSE-SU-2026:10747-1

  • php8.4 AlmaLinux 10 8.4.21-1.el10_2
  • php8.4-gd AlmaLinux 10 8.4.21-1.el10_2
  • php8.4-cli AlmaLinux 10 8.4.21-1.el10_2
  • php8.4-dba AlmaLinux 10 8.4.21-1.el10_2
  • php8.4-dbg AlmaLinux 10 8.4.21-1.el10_2
  • php8.4-ffi AlmaLinux 10 8.4.21-1.el10_2
  • php8.4-fpm AlmaLinux 10 8.4.21-1.el10_2
  • php8.4-gmp AlmaLinux 10 8.4.21-1.el10_2

almalinux advisories ALSA-2026:22649

  • php8.4 Rocky Linux 10 8.4.21-1.el10_2

rocky linux advisories RLSA-2026:22649

  • php84 Alpine 3.22 8.4.27-r0
  • php84 Alpine 3.23 8.4.21-r0
  • php85 Alpine 3.24, Alpine 3.23 8.5.6-r0

alpine advisories ALPINE-CVE-2026-7263

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

Is CVE-2026-7263 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2026-7263 updated cvss 7.5

php: denial of service via DOMNode::C14N()

  • Red Hat Enterprise Linux AppStream (v. 10) php8.4 8.4.21-1.el10_2, php8.4-gd 8.4.21-1.el10_2, php8.4-cli 8.4.21-1.el10_2, php8.4-dba 8.4.21-1.el10_2, php8.4-dbg 8.4.21-1.el10_2, php8.4-ffi 8.4.21-1.el10_2, +18 more
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:22649
  • Red Hat Enterprise Linux 6 php, php-gd, php-cli, php-dba, php-fpm, php-pdo, +20 more 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 Red Hat Hardened Images 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
partial
Assessed
5mo ago

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 4.0 6.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/AU:Y/RE:M/U:Amber
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 6.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/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:Y/R:X/V:X/RE:M/U:Amber
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami libphp
>=8.4.0, <8.4.21
>=8.5.0, <8.5.6
8.4.21
8.5.6
bitnami php
>=8.4.0, <8.4.21
>=8.5.0, <8.5.6
8.4.21
8.5.6
bitnami php-min
>=8.4.0, <8.4.21
>=8.5.0, <8.5.6
8.4.21
8.5.6

Affected products

  • PHP Group PHP
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Hardened Images

Classification

Weakness
  • CWE-404 Improper Resource Shutdown or Release
  • CWE-835 Loop with Unreachable Exit Condition
Technology feeds

References

Sources

Fencer Intel 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.