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Fencer Intel
high 7.5

CVE-2026-7258 json

Out-of-bounds read in urldecode() on NetBSD

published 6mo ago modified last mo. also BIT-libphp-2026-7258 , BIT-php-2026-7258 , BIT-php-min-2026-7258 , EUVD-2026-28968 , GHSA-m8rr-4c36-8gq4

cvss
7.5
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 30%
public exploits
0
none known

Summary

In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, some functions, including urldecode(), pass signed char to ctype functions (like isxdigit()). On the systems with default signed char and optimized table-lookup ctype functions - such as NetBSD - this can lead to accessing array with negative offset, which can trigger a denial of service.

Patch / fix

  • bitnami libphp 8.2.31, 8.3.31, 8.4.21, 8.5.6
  • bitnami php 8.2.31, 8.3.31, 8.4.21, 8.5.6
  • bitnami php-min 8.2.31, 8.3.31, 8.4.21, 8.5.6
  • PHP Group PHP 8.2.31, 8.3.31, 8.4.21, 8.5.6
  • php8.2 Debian 12 8.2.31-1~deb12u1
  • php8.4 Debian 13 8.4.21-1~deb13u1
  • php8.4 Debian 14 8.4.21-1

debian advisories DEBIAN-CVE-2026-7258

  • php8.3 Ubuntu 24.04 LTS 8.3.6-0ubuntu0.24.04.9
  • php8.4 Ubuntu 25.10 8.4.11-1ubuntu1.2
  • php8.5 Ubuntu 26.04 LTS 8.5.4-0ubuntu1.1

ubuntu advisories UBUNTU-CVE-2026-7258

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

  • php RHEL 8 7.4.33-4.module+el8.10.0+24352+91532d3e
  • libzip RHEL 8 1.6.1-1.module+el8.10.0+22485+a3539972
  • php-gd RHEL 8 7.4.33-4.module+el8.10.0+24352+91532d3e
  • php-cli RHEL 8 7.4.33-4.module+el8.10.0+24352+91532d3e
  • php-dba RHEL 8 7.4.33-4.module+el8.10.0+24352+91532d3e
  • php-dbg RHEL 8 7.4.33-4.module+el8.10.0+24352+91532d3e
  • php-ffi RHEL 8 7.4.33-4.module+el8.10.0+24352+91532d3e
  • php-fpm RHEL 8 7.4.33-4.module+el8.10.0+24352+91532d3e

red hat advisories RHSA-2026:34354RHSA-2026:33449RHSA-2026:23388RHSA-2026:22649RHSA-2026:22305RHSA-2026:22143

  • php8 openSUSE Tumbleweed 8.5.6-1.1

opensuse advisories openSUSE-SU-2026:10747-1

  • php AlmaLinux 8 7.4.33-4.module_el8.10.0+4209+2ed16ff0
  • libzip AlmaLinux 8 1.6.1-1.module_el8.6.0+3239+bedf0508
  • libzip AlmaLinux 8 1.6.1-1.module_el8.6.0+2750+78feabcb
  • libzip AlmaLinux 8 1.6.1-1.module_el8.10.0+3935+28808425
  • php-gd AlmaLinux 8 7.4.33-4.module_el8.10.0+4209+2ed16ff0
  • php-cli AlmaLinux 8 7.4.33-4.module_el8.10.0+4209+2ed16ff0
  • php-dba AlmaLinux 8 7.4.33-4.module_el8.10.0+4209+2ed16ff0
  • php-dbg AlmaLinux 8 7.4.33-4.module_el8.10.0+4209+2ed16ff0

almalinux advisories ALSA-2026:34354ALSA-2026:33449ALSA-2026:23388ALSA-2026:22649ALSA-2026:22142ALSA-2026:22143

  • php Rocky Linux 9 8.0.30-6.el9_8
  • libzip Rocky Linux 8 1.6.1-1.module+el8.10.0+1604+6558efc7
  • libzip Rocky Linux 8 1.6.1-1.module+el8.10.0+1912+72767185
  • php-pear Rocky Linux 8 1:1.10.13-1.module+el8.10.0+1604+6558efc7
  • php-pear Rocky Linux 8 1:1.10.13-1.module+el8.10.0+1605+02e07af7
  • php-pear Rocky Linux 8 1:1.10.13-1.module+el8.10.0+1912+72767185
  • php-pecl-rrd Rocky Linux 8 2.0.1-1.module+el8.4.0+414+2e7afcdd
  • php-pecl-rrd Rocky Linux 8 2.0.1-1.module+el8.10.0+1912+72767185

rocky linux advisories RLSA-2026:33449RLSA-2026:34354RLSA-2026:23388RLSA-2026:22649RLSA-2026:22305RLSA-2026:22142

  • php81 Alpine 3.19 8.1.34-r0
  • php82 Alpine 3.22 8.2.31-r0
  • php83 Alpine 3.22 8.3.36-r0
  • php83 Alpine 3.24, Alpine 3.23 8.3.31-r0
  • php84 Alpine 3.22 8.4.27-r0
  • php84 Alpine 3.24, Alpine 3.23 8.4.21-r0
  • php85 Alpine 3.24, Alpine 3.23 8.5.6-r0

alpine advisories ALPINE-CVE-2026-7258

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

  • php Azure Linux 3.0 8.3.31-1

azure linux advisories AZL-86346

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Is CVE-2026-7258 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-2026-7258 updated cvss 5.9

PHP: PHP: Denial of Service via improper handling of signed characters in ctype functions

  • 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 OpenShift AI (RHOAI) rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9 Red Hat OpenShift Dev Spaces devspaces/code-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 8) php 7.4.33-4.module+el8.10.0+24352+91532d3e, php 8.2.31-1.module+el8.10.0+24323+abc2b0db, libzip 1.6.1-1.module+el8.10.0+22485+a3539972, libzip 1.7.3-1.module+el8.10.0+20770+a5eca186, php-gd 7.4.33-4.module+el8.10.0+24352+91532d3e, php-gd 8.2.31-1.module+el8.10.0+24323+abc2b0db, +60 more
    fixed: vendor fix RHSA-2026:34354
  • Red Hat Enterprise Linux AppStream (v. 9) php 8.0.30-6.el9_8, php-gd 8.0.30-6.el9_8, php-cli 8.0.30-6.el9_8, php-dba 8.0.30-6.el9_8, php-dbg 8.0.30-6.el9_8, php-ffi 8.0.30-6.el9_8, +77 more
    fixed: vendor fix RHSA-2026:22142
  • Red Hat Enterprise Linux AppStream (v. 10) php 8.3.31-1.el10_2, php-gd 8.3.31-1.el10_2, php8.4 8.4.21-1.el10_2, php-cli 8.3.31-1.el10_2, php-dba 8.3.31-1.el10_2, php-dbg 8.3.31-1.el10_2, +42 more
    fixed: vendor fix RHSA-2026:23388
  • Red Hat Hardened Images php 8.5.6-1.hum1, php-gd 8.5.6-1.hum1, php-cli 8.5.6-1.hum1, php-dba 8.5.6-1.hum1, php-dbg 8.5.6-1.hum1, php-ffi 8.5.6-1.hum1, +21 more
    fixed: vendor fix RHSA-2026:14125

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
no
Technical impact
partial
Assessed
5mo ago

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 30% 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:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/U:Amber
CNA 4.0 6.3 CVSS:4.0/AV:N/AC:H/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:X/R:X/V:X/RE:X/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
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
>=8.2.0, <8.2.31
>=8.3.0, <8.3.31
>=8.4.0, <8.4.21
>=8.5.0, <8.5.6
8.2.31
8.3.31
8.4.21
8.5.6
bitnami php
>=8.2.0, <8.2.31
>=8.3.0, <8.3.31
>=8.4.0, <8.4.21
>=8.5.0, <8.5.6
8.2.31
8.3.31
8.4.21
8.5.6
bitnami php-min
>=8.2.0, <8.2.31
>=8.3.0, <8.3.31
>=8.4.0, <8.4.21
>=8.5.0, <8.5.6
8.2.31
8.3.31
8.4.21
8.5.6

Affected products

  • PHP Group PHP

Classification

Weakness
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.