Medium severity6.5NVD Advisory· Published Sep 25, 2026· Updated Oct 27, 2026
CVE-2026-91767
CVE-2026-91767
Description
php_openssl_matches_wildcard_name() in ext/openssl/xp_ssl.c underflows the length argument passed to memchr() when a TLS server certificate presents a wildcard name whose literal characters are together longer than the hostname being verified. A malicious server presenting such a certificate makes the PHP client read up to SIZE_MAX bytes past the end of a heap allocation. The path is reachable from any default client stream, because verify_peer_name is enabled by default.
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-xr7j-rvgx-xq5pnvdVendor Advisory
News mentions
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