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CVE-2026-2646

Estado: AnalizadaMedia (5)—

A heap-buffer-overflow vulnerability exists in wolfSSL's wolfSSL_d2i_SSL_SESSION() function. When deserializing session data with SESSION_CERTS enabled, certificate and session id lengths are read from an untrusted input without bounds validation, allowing an attacker to overflow fixed-size buffers and corrupt heap memory. A maliciously crafted session would need to be loaded from an external source to trigger this vulnerability. Internal sessions were not vulnerable.

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)

Wolfssl — Wolfssl

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-2646",
  "cveTags": [],
  "metrics": {
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          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
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            },
            {
              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-03-19T17:43:50.325959Z"
        }
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    "cvssMetricV31": [
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        "cvssData": {
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          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
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          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "exploitabilityScore": 2.2
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    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "facts@wolfssl.com",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 5,
          "Automatable": "NOT_DEFINED",
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
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          "modifiedUserInteraction": "NOT_DEFINED",
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          "modifiedAttackRequirements": "NOT_DEFINED",
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          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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      "affectedData": [
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          "vendor": "wolfssl",
          "product": "wolfssl",
          "versions": [
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              "version": "0",
              "versionType": "semver",
              "lessThanOrEqual": "5.8.4"
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          ],
          "programFiles": [
            "src/ssl_sess.c"
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          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "wolfSSL_d2i_SSL_SESSION"
            }
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  "published": "2026-03-19T18:16:22.223",
  "references": [
    {
      "url": "https://github.com/wolfSSL/wolfssl/pull/9748",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "source": "facts@wolfssl.com"
    },
    {
      "url": "https://github.com/wolfSSL/wolfssl/pull/9949",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "source": "facts@wolfssl.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "facts@wolfssl.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-122"
        }
      ]
    },
    {
      "type": "Primary",
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      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
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      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A heap-buffer-overflow vulnerability exists in wolfSSL's wolfSSL_d2i_SSL_SESSION() function. When deserializing session data with SESSION_CERTS enabled, certificate and session id lengths are read from an untrusted input without bounds validation, allowing an attacker to overflow fixed-size buffers and corrupt heap memory. A maliciously crafted session would need to be loaded from an external source to trigger this vulnerability. Internal sessions were not vulnerable."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de desbordamiento de búfer de montón existe en la función wolfSSL_d2i_SSL_SESSION() de wolfSSL. Al deserializar datos de sesión con SESSION_CERTS habilitado, las longitudes del certificado y del ID de sesión se leen de una entrada no confiable sin validación de límites, permitiendo a un atacante desbordar búferes de tamaño fijo y corromper la memoria del montón. Una sesión creada maliciosamente necesitaría ser cargada desde una fuente externa para activar esta vulnerabilidad. Las sesiones internas no eran vulnerables."
    }
  ],
  "lastModified": "2026-06-17T10:31:27.500",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "DA3FA1CB-CEDC-4D49-9ECD-99BBF1602312",
              "versionEndExcluding": "5.9.0"
            }
          ],
          "operator": "OR"
        }
      ]
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  ],
  "sourceIdentifier": "facts@wolfssl.com"
}