Bug 2541652 (CVE-2026-91767)

Summary: CVE-2026-91767 php: php: Information disclosure via crafted TLS server certificate
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in PHP. When validating secure connections using Transport Layer Security (TLS), an error in how wildcard domain names in server certificates are verified can lead to an out-of-bounds memory read. A malicious server presenting a specially crafted certificate can exploit this issue against a connecting PHP client. This flaw primarily leads to information disclosure, potentially exposing sensitive data stored in application memory.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-25 21:01:12 UTC 
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.