CVE-2026-91768
IPv6 ACL bypass in FastCGI listen.allowed_clients due to partial address comparison (memcmp 12 bytes)
02 Description
IPv6 ACL bypass in FastCGI listen.allowed_clients due to partial address comparison (memcmp 12 bytes)
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.37% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 31.3% of scored records. A rank, not a probability.
- NVD base score
- 6.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- NVD analysis status
- Analyzed. NVD last modified this record on 2026-10-27.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-09-25 21:07Z1 MO AGO
- Last updated
- 2026-09-28 13:31Z1 MO AGO
- Reserved
- 2026-09-15
- Assigning CNA
- php
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 6.5)
- CNA CVSS vector
- CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weaknesses
- Data version
- 5.2
- Document digest
- 82d517505a9d5f6c61d0686fb63803f9e5263dbd7f1fd276996f8f51952263b4
05 Affected products
06 References
07 Fixed in
AlmaLinux 8
- apcu-panel Fixed in 5.1.18-1.module_el8.6.0+2750+78feabcb
- libzip Fixed
A version is affected if any line below covers it.
- Affected before 1.6.1-1.module_el8.10.0+3935+28808425
- Affected before 1.6.1-1.module_el8.6.0+2750+78feabcb
- Affected before 1.6.1-1.module_el8.6.0+3239+bedf0508
- libzip-devel Fixed
A version is affected if any line below covers it.
- Affected before 1.6.1-1.module_el8.10.0+3935+28808425
- Affected before 1.6.1-1.module_el8.6.0+2750+78feabcb
- Affected before 1.6.1-1.module_el8.6.0+3239+bedf0508
- libzip-tools Fixed
A version is affected if any line below covers it.
- Affected before 1.6.1-1.module_el8.10.0+3935+28808425
- Affected before 1.6.1-1.module_el8.6.0+3239+bedf0508
- php Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-bcmath Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-cli Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-common Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-dba Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-dbg Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-devel Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-embedded Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-enchant Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-ffi Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-fpm Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-gd Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-gmp Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-intl Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-json Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-ldap Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-mbstring Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-mysqlnd Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-odbc Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-opcache Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-pdo Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-pear Fixed in 1:1.10.13-1.module_el8.10.0+3935+28808425
- php-pecl-apcu Fixed
A version is affected if any line below covers it.
- Affected before 5.1.18-1.module_el8.10.0+3935+28808425
- Affected before 5.1.18-1.module_el8.6.0+2750+78feabcb
- php-pecl-apcu-devel Fixed
A version is affected if any line below covers it.
- Affected before 5.1.18-1.module_el8.10.0+3935+28808425
- Affected before 5.1.18-1.module_el8.6.0+2750+78feabcb
- php-pecl-rrd Fixed
A version is affected if any line below covers it.
- Affected before 2.0.1-1.module_el8.10.0+3935+28808425
- Affected before 2.0.1-1.module_el8.6.0+2750+78feabcb
- Affected before 2.0.1-1.module_el8.6.0+3239+bedf0508
- php-pecl-xdebug Fixed
A version is affected if any line below covers it.
- Affected before 2.9.5-1.module_el8.6.0+2750+78feabcb
- Affected before 2.9.5-1.module_el8.6.0+3239+bedf0508
- php-pecl-zip Fixed
A version is affected if any line below covers it.
- Affected before 1.18.2-1.module_el8.10.0+3935+28808425
- Affected before 1.18.2-1.module_el8.6.0+2750+78feabcb
- Affected before 1.18.2-1.module_el8.6.0+3239+bedf0508
- php-pgsql Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-process Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-snmp Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-soap Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-xml Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-xmlrpc Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- apcu-panel Fixed in 5.1.18-1.module_el8.6.0+2750+78feabcb
- libzip Fixed
A version is affected if any line below covers it.
- Affected before 1.6.1-1.module_el8.10.0+3935+28808425
- Affected before 1.6.1-1.module_el8.6.0+2750+78feabcb
- Affected before 1.6.1-1.module_el8.6.0+3239+bedf0508
- libzip-devel Fixed
A version is affected if any line below covers it.
- Affected before 1.6.1-1.module_el8.10.0+3935+28808425
- Affected before 1.6.1-1.module_el8.6.0+2750+78feabcb
- Affected before 1.6.1-1.module_el8.6.0+3239+bedf0508
- libzip-tools Fixed
A version is affected if any line below covers it.
- Affected before 1.6.1-1.module_el8.10.0+3935+28808425
- Affected before 1.6.1-1.module_el8.6.0+3239+bedf0508
- php Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-bcmath Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-cli Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-common Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-dba Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-dbg Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-devel Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-embedded Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-enchant Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-ffi Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-fpm Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-gd Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-gmp Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-intl Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-json Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-ldap Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-mbstring Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-mysqlnd Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-odbc Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-opcache Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-pdo Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-pear Fixed in 1:1.10.13-1.module_el8.10.0+3935+28808425
- php-pecl-apcu Fixed
A version is affected if any line below covers it.
- Affected before 5.1.18-1.module_el8.10.0+3935+28808425
- Affected before 5.1.18-1.module_el8.6.0+2750+78feabcb
- php-pecl-apcu-devel Fixed
A version is affected if any line below covers it.
- Affected before 5.1.18-1.module_el8.10.0+3935+28808425
- Affected before 5.1.18-1.module_el8.6.0+2750+78feabcb
- php-pecl-rrd Fixed
A version is affected if any line below covers it.
- Affected before 2.0.1-1.module_el8.10.0+3935+28808425
- Affected before 2.0.1-1.module_el8.6.0+2750+78feabcb
- Affected before 2.0.1-1.module_el8.6.0+3239+bedf0508
- php-pecl-xdebug Fixed
A version is affected if any line below covers it.
- Affected before 2.9.5-1.module_el8.6.0+2750+78feabcb
- Affected before 2.9.5-1.module_el8.6.0+3239+bedf0508
- php-pecl-zip Fixed
A version is affected if any line below covers it.
- Affected before 1.18.2-1.module_el8.10.0+3935+28808425
- Affected before 1.18.2-1.module_el8.6.0+2750+78feabcb
- Affected before 1.18.2-1.module_el8.6.0+3239+bedf0508
- php-pgsql Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-process Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-snmp Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-soap Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-xml Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- php-xmlrpc Fixed in 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- php8.2 Fixed in 8.2.34-1~deb12u1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- php8.4 Fixed in 8.4.26-1~deb13u1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- php8.4 Fixed in 8.4.26-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- php8.1 Fixed in 8.1.2-1ubuntu2.27
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- php8.3 Fixed in 8.3.6-0ubuntu0.24.04.12
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.04 LTS
- php8.5 Fixed in 8.5.4-0ubuntu1.4
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.10
- php8.5 Fixed in 8.5.9-0ubuntu2
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- php7.0 Fixed in 7.0.33-0ubuntu0.16.04.16+esm21Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 18.04 LTS
- php7.2 Fixed in 7.2.24-0ubuntu0.18.04.17+esm13Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- php7.4 Fixed in 7.4.3-4ubuntu2.29+esm4Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.