Medium severity6.5NVD Advisory· Published Sep 25, 2026· Updated Oct 27, 2026
CVE-2026-91768
CVE-2026-91768
Description
The IPv6 branch of the FastCGI client access check compares only the first 12 bytes of a 16-byte IPv6 address, so listen.allowed_clients matches on a /96 prefix instead of the exact address. An attacker who can source an address sharing the first 96 bits with an allowed one passes the check and reaches the FastCGI endpoint.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
43- osv-coords41 versionspkg:bitnami/libphppkg:bitnami/phppkg:bitnami/php-minpkg:rpm/almalinux/apcu-panelpkg:rpm/almalinux/libzippkg:rpm/almalinux/libzip-develpkg:rpm/almalinux/libzip-toolspkg:rpm/almalinux/phppkg:rpm/almalinux/php-bcmathpkg:rpm/almalinux/php-clipkg:rpm/almalinux/php-commonpkg:rpm/almalinux/php-dbapkg:rpm/almalinux/php-dbgpkg:rpm/almalinux/php-develpkg:rpm/almalinux/php-embeddedpkg:rpm/almalinux/php-enchantpkg:rpm/almalinux/php-ffipkg:rpm/almalinux/php-fpmpkg:rpm/almalinux/php-gdpkg:rpm/almalinux/php-gmppkg:rpm/almalinux/php-intlpkg:rpm/almalinux/php-jsonpkg:rpm/almalinux/php-ldappkg:rpm/almalinux/php-mbstringpkg:rpm/almalinux/php-mysqlndpkg:rpm/almalinux/php-odbcpkg:rpm/almalinux/php-opcachepkg:rpm/almalinux/php-pdopkg:rpm/almalinux/php-pearpkg:rpm/almalinux/php-pecl-apcupkg:rpm/almalinux/php-pecl-apcu-develpkg:rpm/almalinux/php-pecl-rrdpkg:rpm/almalinux/php-pecl-xdebugpkg:rpm/almalinux/php-pecl-zippkg:rpm/almalinux/php-pgsqlpkg:rpm/almalinux/php-processpkg:rpm/almalinux/php-snmppkg:rpm/almalinux/php-soappkg:rpm/almalinux/php-xmlpkg:rpm/almalinux/php-xmlrpcpkg:rpm/opensuse/php8&distro=openSUSE%20Tumbleweed
>= 8.2.0, < 8.2.34+ 40 more
- (no CPE)range: >= 8.2.0, < 8.2.34
- (no CPE)range: >= 8.2.0, < 8.2.34
- (no CPE)range: >= 8.2.0, < 8.2.34
- (no CPE)range: < 5.1.18-1.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 1.6.1-1.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 1.6.1-1.module_el8.10.0+3935+28808425
- (no CPE)range: < 1.6.1-1.module_el8.10.0+3935+28808425
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 1:1.10.13-1.module_el8.10.0+3935+28808425
- (no CPE)range: < 5.1.18-1.module_el8.10.0+3935+28808425
- (no CPE)range: < 5.1.18-1.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 2.0.1-1.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 2.9.5-1.module_el8.6.0+3239+bedf0508
- (no CPE)range: < 1.18.2-1.module_el8.10.0+3935+28808425
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 7.4.33-8.module_el8.10.0+4321+cf5fd4bb
- (no CPE)range: < 8.5.11-1.1
Patches
Vulnerability mechanics
References
1- github.com/php/php-src/security/advisories/GHSA-62xp-839h-2637nvdVendor Advisory
News mentions
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