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CVE-2026-44518

Estado: AnalizadaMedia (5.3)—

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.

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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

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Openquantumsafe — Liboqs

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-44518",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-44518",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-05-29T18:40:40.107815Z"
        }
      }
    ],
    "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"
            }
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  ],
  "published": "2026-05-29T19:16:24.263",
  "references": [
    {
      "url": "https://github.com/open-quantum-safe/liboqs/commit/ef70dea7c85e5637f37828d75e5b9bb29dbfe513",
      "tags": [
        "Patch"
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    {
      "url": "https://github.com/open-quantum-safe/liboqs/security/advisories/GHSA-wf7v-fhxj-73m2",
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        "Patch",
        "Vendor Advisory"
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      "source": "security-advisories@github.com"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        },
        {
          "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 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 criptográfica en lenguaje C que proporciona implementaciones de algoritmos de criptografía postcuántica. Antes de 0.16.0, se ha identificado una lectura fuera de límites en el código de verificación de firmas con estado XMSS y XMSS^MT. Cuando la función de verificación es llamada con un búfer de firma más corto que el tamaño de firma esperado para el conjunto de parámetros dado, la implementación no valida la longitud proporcionada por el llamador y procede a leer más allá del final del búfer. Los bytes fuera de límites son consumidos solo como entrada para un cálculo de hash interno y no son devueltos al llamador, por lo que no existe un oráculo para filtrar su contenido a un atacante. El efecto observable principal es una posible caída (denegación de servicio) del proceso de verificación si la lectura cruza a una página de memoria no mapeada. Esta vulnerabilidad está corregida en 0.16.0."
    }
  ],
  "lastModified": "2026-07-21T18:10:00.117",
  "configurations": [
    {
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          "negate": false,
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              "versionEndIncluding": "0.15.0"
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  "sourceIdentifier": "security-advisories@github.com"
}