CVE-2026-44518

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{"affected": [{"affectedData": [{"product": "liboqs", "vendor": "open-quantum-safe", "versions": [{"status": "affected", "version": "< 0.16.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:openquantumsafe:liboqs:*:*:*:*:*:*:*:*", "matchCriteriaId": "1F419503-9374-44DA-84C1-25E5FAA191C3", "versionEndIncluding": "0.15.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "liboqs is a C-language cryptographic library that provides implementations of post-quantum cryptography algorithms. Prior to 0.16.0, an out-of-bounds read has been identified in the XMSS and XMSS^MT stateful signature verification code. When the verification function is called with a signature buffer shorter than the expected signature size for the given parameter set, the implementation does not validate the caller-supplied length and proceeds to read past the end of the buffer. The out-of-bounds bytes are consumed only as input to an internal hash computation and are not returned to the caller, so no oracle exists to leak their contents to an attacker. The primary observable effect is a possible crash (denial of service) of the verifying process if the read crosses into an unmapped memory page. This vulnerability is fixed in 0.16.0."}, {"lang": "es", "value": "liboqs es una biblioteca criptogr\u00e1fica en lenguaje C que proporciona implementaciones de algoritmos de criptograf\u00eda postcu\u00e1ntica. Antes de 0.16.0, se ha identificado una lectura fuera de l\u00edmites en el c\u00f3digo de verificaci\u00f3n de firmas con estado XMSS y XMSS^MT. Cuando la funci\u00f3n de verificaci\u00f3n es llamada con un b\u00fafer de firma m\u00e1s corto que el tama\u00f1o de firma esperado para el conjunto de par\u00e1metros dado, la implementaci\u00f3n no valida la longitud proporcionada por el llamador y procede a leer m\u00e1s all\u00e1 del final del b\u00fafer. Los bytes fuera de l\u00edmites son consumidos solo como entrada para un c\u00e1lculo de hash interno y no son devueltos al llamador, por lo que no existe un or\u00e1culo para filtrar su contenido a un atacante. El efecto observable principal es una posible ca\u00edda (denegaci\u00f3n de servicio) del proceso de verificaci\u00f3n si la lectura cruza a una p\u00e1gina de memoria no mapeada. Esta vulnerabilidad est\u00e1 corregida en 0.16.0."}], "id": "CVE-2026-44518", "lastModified": "2026-07-21T18:10:00.117", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-44518", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-29T18:40:40.107815Z", "version": "2.0.3"}}]}, "published": "2026-05-29T19:16:24.263", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/open-quantum-safe/liboqs/commit/ef70dea7c85e5637f37828d75e5b9bb29dbfe513"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Vendor Advisory"], "url": "https://github.com/open-quantum-safe/liboqs/security/advisories/GHSA-wf7v-fhxj-73m2"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}, {"lang": "en", "value": "CWE-125"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "liboqs: liboqs: Denial of Service due to out-of-bounds read in XMSS/XMSS^MT signature verification", "id": "2483392", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2483392"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-1284", "details": ["A flaw was found in liboqs, a C-language cryptographic library. An out-of-bounds read vulnerability exists in the XMSS and XMSS^MT stateful signature verification code. A remote attacker could exploit this by providing a malformed signature that is shorter than expected. This could lead to a denial of service (DoS) if the verifying process attempts to read beyond allocated memory, potentially causing a crash."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-44518", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "liboqs", "product_name": "Red Hat Enterprise Linux 10"}], "public_date": "2026-05-29T18:07:07Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-44518\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-44518\nhttps://github.com/open-quantum-safe/liboqs/commit/ef70dea7c85e5637f37828d75e5b9bb29dbfe513\nhttps://github.com/open-quantum-safe/liboqs/security/advisories/GHSA-wf7v-fhxj-73m2"], "statement": "This is a Moderate denial of service vulnerability in liboqs, a cryptographic library used in Red Hat products. A remote attacker can trigger an out-of-bounds read during XMSS or XMSS^MT signature verification by supplying a malformed, undersized signature. This can lead to a crash of the verifying process, resulting in a denial of service.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.16.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "liboqs", "source": "cna", "vendor": "open-quantum-safe"}, "product": "liboqs", "vendor": "open_quantum_safe"}], "created": "2026-05-29T19:30:05.415410+00:00", "updated": "2026-06-02T14:00:10.561022+00:00", "vendors": ["open_quantum_safe", "open_quantum_safe$PRODUCT$liboqs"], "weaknesses": ["CWE-125", "CWE-1284", "CWE-20"]}