rust-openssl: undefined behavior in X509Ref::ocsp_responders for certificates with non-UTF-8 OCSP URLs_CVE-2026-42327

{
    "lastseen": "",
    "description": "rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.7 to before 0.10.79, X509Ref::ocsp_responders returns OCSP responder URLs from a certificate's AIA extension as OpensslString, whose Deref<Target = str> wraps the raw bytes with str::from_utf8_unchecked. OpenSSL does not enforce that the underlying IA5String is ASCII, so a certificate with non-UTF-8 bytes in its OCSP accessLocation causes safe Rust code to construct a &str that violates the UTF-8 invariant \u2014 resulting in undefined behavior. This vulnerability is fixed in 0.10.79.",
    "published": "2026-05-14T20:17:39.923Z",
    "modified": "2026-05-14T20:17:39.923Z",
    "type": "cve",
    "title": "rust-openssl: undefined behavior in X509Ref::ocsp_responders for certificates with non-UTF-8 OCSP URLs",
    "source": "GitHub_M",
    "references": "https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-xp3w-r5p5-63rr",
    "id": "CVE-2026-42327",
    "bulletinFamily": "",
    "cwe": [
        "CWE-20"
    ],
    "cvelist": null,
    "sourceData": "rust-openssl rust-openssl >= 0.9.7, < 0.10.79",
    "sourceHref": "",
    "cvss": {
        "score": 8.7,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "rust-openssl",
    "version": ">= 0.9.7, < 0.10.79",
    "vendor": "rust-openssl",
    "ai_description": "Undefined behavior in X509Ref::ocsp_responders due to non-UTF-8 OCSP URLs",
    "ai_severity": "High",
    "ai_vendor": "rust-openssl",
    "ai_product": "rust-openssl",
    "ai_version": ">= 0.9.7, < 0.10.79",
    "ai_score": 8.7
}