CVE-2026-91767

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.

Database specific

{
    "cna_assigner": "php",
    "cwe_ids": [
        "CWE-122"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91767.json"
}

References

Affected packages

Git / github.com/php/php-src

Affected ranges

Type

GIT

Repo

https://github.com/php/php-src

Events

Introduced

70ee6c20ad97e02c2b8098aeea96fefbbc3ac5c2

Fixed

0be211a0cf752780881a9611224f8adc516af573

Introduced

d26068059e83fe40de3430a512471d194119bee0

Fixed

2d3433d24d59f45703be2b4fb40d74e5a41b136b

Introduced

b437f2b32eb364c9496d24abcc734272e5c9c980

Fixed

c31ae58ecbedc7a85dac0eee5a6a88da73543e70

Introduced

685e99655ae97c667950f7f7d176985958718f56

Fixed

678778973bb4d4185c06ef1320de50f1a975d3c8

Database specific

Show details

{
    "extracted_events": [
        {
            "cpe": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "8.2.0"
                },
                {
                    "fixed": "8.2.34"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "cpe": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "8.3.0"
                },
                {
                    "fixed": "8.3.35"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "cpe": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "8.4.0"
                },
                {
                    "fixed": "8.4.26"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "cpe": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "8.5.0"
                },
                {
                    "fixed": "8.5.11"
                }
            ],
            "source": "CPE_RANGE"
        }
    ]
}

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-91767.json"