Answer in brief
CVE-2026-91767 records a Medium severity (CVSS 6.5) vulnerability in Heap-buffer-overflow in php_openssl_matches_wildcard_name on crafted server cert wildcard CN. The current sources do not mark it as known exploited. The current feed maps PHP Group/PHP (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps PHP Group/PHP (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| PHP Group/PHPgeneric | >=8.2.* <8.2.34 || >=8.3.* <8.3.35 || >=8.4.* <8.4.26 || >=8.5.* <8.5.11 | 8.2.34, 8.3.35, 8.4.26, 8.5.11 |
Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 25, 2026
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.
Quoted source text, attributed separately from HOL analysis.