GHSA-273P-M2CW-6833

Vulnerability from github – Published: 2026-01-22 18:41 – Updated: 2026-01-23 15:46
VLAI?
Summary
Rekor's COSE v0.0.1 entry type nil pointer dereference in Canonicalize via empty Message
Details

Summary

Rekor’s cose v0.0.1 entry implementation can panic on attacker-controlled input when canonicalizing a proposed entry with an empty spec.message. validate() returns nil (success) when message is empty, leaving sign1Msg uninitialized, and Canonicalize() later dereferences v.sign1Msg.Payload.

Impact

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.

Patches

Upgrade to v1.5.0

Workarounds

None

Severity ?
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.4.3"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/sigstore/rekor"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.5.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-23831"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-22T18:41:23Z",
    "nvd_published_at": "2026-01-22T22:16:19Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nRekor\u2019s cose v0.0.1 entry implementation can panic on attacker-controlled input when canonicalizing a proposed entry with an empty `spec.message`. `validate()` returns nil (success) when `message` is empty, leaving `sign1Msg` uninitialized, and `Canonicalize()` later dereferences `v.sign1Msg.Payload`.\n\n## Impact\n\nA 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.\n\n## Patches\n\nUpgrade to v1.5.0\n\n## Workarounds\n\nNone",
  "id": "GHSA-273p-m2cw-6833",
  "modified": "2026-01-23T15:46:17Z",
  "published": "2026-01-22T18:41:23Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sigstore/rekor/security/advisories/GHSA-273p-m2cw-6833"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23831"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sigstore/rekor/commit/39bae3d192bce48ef4ef2cbd1788fb5770fee8cd"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/sigstore/rekor"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sigstore/rekor/releases/tag/v1.5.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Rekor\u0027s COSE v0.0.1 entry type nil pointer dereference in Canonicalize via empty Message"
}


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