CVE-2026-46344

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 correctly-sized signature buffer for the declared algorithm but a public key whose OID bytes (pk[0..3]) reference a different XMSS parameter set with a larger sig_bytes, the implementation re-parses the OID from the public key inside xmss_sign_open / xmssmt_sign_open and uses the resulting (larger) sig_bytes to index the caller-supplied signature buffer. As with CVE-2026-44518, 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.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/open-quantum-safe/liboqs/commit/077e32a94f39af02209dbbc680bf8a43b774b305	Patch
https://github.com/open-quantum-safe/liboqs/security/advisories/GHSA-2wxh-55qf-c7wg	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:openquantumsafe:liboqs:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-29 19:16

Updated : 2026-07-22 06:10

NVD link : CVE-2026-46344

Mitre link : CVE-2026-46344

CVE.ORG link : CVE-2026-46344

JSON object : View

Products Affected

openquantumsafe

liboqs

CWE

CWE-125

Out-of-bounds Read

{"id": "CVE-2026-46344", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46344", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-29T18:39:44.149887Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "open-quantum-safe", "product": "liboqs", "versions": [{"status": "affected", "version": "< 0.16.0"}]}]}], "published": "2026-05-29T19:16:25.350", "references": [{"url": "https://github.com/open-quantum-safe/liboqs/commit/077e32a94f39af02209dbbc680bf8a43b774b305", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/open-quantum-safe/liboqs/security/advisories/GHSA-2wxh-55qf-c7wg", "tags": ["Patch", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-125"}]}], "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 correctly-sized signature buffer for the declared algorithm but a public key whose OID bytes (pk[0..3]) reference a different XMSS parameter set with a larger sig_bytes, the implementation re-parses the OID from the public key inside xmss_sign_open / xmssmt_sign_open and uses the resulting (larger) sig_bytes to index the caller-supplied signature buffer. As with CVE-2026-44518, 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 la versi\u00f3n 0.16.0, se ha identificado una lectura fuera de l\u00edmites en el c\u00f3digo de verificaci\u00f3n de firma con estado de XMSS y XMSS^MT. Cuando se llama a la funci\u00f3n de verificaci\u00f3n con un b\u00fafer de firma de tama\u00f1o correcto para el algoritmo declarado pero una clave p\u00fablica cuyos bytes OID (pk[0..3]) hacen referencia a un conjunto de par\u00e1metros XMSS diferente con un sig_bytes mayor, la implementaci\u00f3n vuelve a analizar el OID de la clave p\u00fablica dentro de xmss_sign_open / xmssmt_sign_open y utiliza el sig_bytes resultante (mayor) para indexar el b\u00fafer de firma proporcionado por el llamador. Al igual que con CVE-2026-44518, los bytes fuera de l\u00edmites se consumen solo como entrada para un c\u00e1lculo de hash interno y no se devuelven al llamador, por lo que no existe un or\u00e1culo para filtrar su contenido a un atacante. El efecto observable principal es un posible fallo (denegaci\u00f3n de servicio) del proceso de verificaci\u00f3n si la lectura cruza a una p\u00e1gina de memoria no mapeada. Esta vulnerabilidad se corrige en la versi\u00f3n 0.16.0."}], "lastModified": "2026-07-22T06:10:00.170", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:openquantumsafe:liboqs:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1F419503-9374-44DA-84C1-25E5FAA191C3", "versionEndIncluding": "0.15.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}