FKIE_CVE-2026-23831

Vulnerability from fkie_nvd - Published: 2026-01-22 22:16 - Updated: 2026-02-02 15:06
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Summary
Rekor is a software supply chain transparency log. In versions 1.4.3 and below, the entry implementation can panic on attacker-controlled input when canonicalizing a proposed entry with an empty spec.message, causing nil Pointer Dereference. Function validate() returns nil (success) when message is empty, leaving sign1Msg uninitialized, and Canonicalize() later dereferences v.sign1Msg.Payload. A malformed proposed entry of the cose/v0.0.1 type can cause a panic on a thread within the Rekor process. The thread is recovered so the client receives a 500 error message and service still continues, so the availability impact of this is minimal. This issue has been fixed in version 1.5.0.
References
security-advisories@github.comhttps://github.com/sigstore/rekor/commit/39bae3d192bce48ef4ef2cbd1788fb5770fee8cdPatch
security-advisories@github.comhttps://github.com/sigstore/rekor/releases/tag/v1.5.0Product, Release Notes
security-advisories@github.comhttps://github.com/sigstore/rekor/security/advisories/GHSA-273p-m2cw-6833Vendor Advisory
Impacted products
Vendor Product Version
linuxfoundation rekor *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:linuxfoundation:rekor:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "046CFEF8-2DAB-4D9A-AD13-CB83A9EB462E",
              "versionEndExcluding": "1.5.0",
              "vulnerable": true
            }
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          "negate": false,
          "operator": "OR"
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Rekor is a software supply chain transparency log. In versions 1.4.3 and below, the entry implementation can panic on attacker-controlled input when canonicalizing a proposed entry with an empty spec.message, causing nil Pointer Dereference. Function validate() returns nil (success) when message is empty, leaving sign1Msg uninitialized, and Canonicalize() later dereferences v.sign1Msg.Payload. A malformed proposed entry of the cose/v0.0.1 type can cause a panic on a thread within the Rekor process. The thread is recovered so the client receives a 500 error message and service still continues, so the availability impact of this is minimal. This issue has been fixed in version 1.5.0."
    },
    {
      "lang": "es",
      "value": "Rekor es un registro de transparencia de la cadena de suministro de software. En las versiones 1.4.3 e inferiores, la implementaci\u00f3n de entrada puede entrar en p\u00e1nico con una entrada controlada por el atacante al canonizar una entrada propuesta con un spec.message vac\u00edo, causando una desreferenciaci\u00f3n de puntero nulo. La funci\u00f3n validate() devuelve nil (\u00e9xito) cuando el mensaje est\u00e1 vac\u00edo, dejando sign1Msg sin inicializar, y Canonicalize() desreferencia posteriormente v.sign1Msg.Payload. Una entrada propuesta malformada del tipo cose/v0.0.1 puede causar un p\u00e1nico en un hilo dentro del proceso de Rekor. El hilo se recupera por lo que el cliente recibe un mensaje de error 500 y el servicio a\u00fan contin\u00faa, por lo que el impacto en la disponibilidad de esto es m\u00ednimo. Este problema ha sido solucionado en la versi\u00f3n 1.5.0."
    }
  ],
  "id": "CVE-2026-23831",
  "lastModified": "2026-02-02T15:06:43.427",
  "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"
      }
    ]
  },
  "published": "2026-01-22T22:16:19.523",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/sigstore/rekor/commit/39bae3d192bce48ef4ef2cbd1788fb5770fee8cd"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
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        "Release Notes"
      ],
      "url": "https://github.com/sigstore/rekor/releases/tag/v1.5.0"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/sigstore/rekor/security/advisories/GHSA-273p-m2cw-6833"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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