BREW-SIGSTORE-CVE-2026-24408 (CVE-2026-24408)

Vulnerability from osv_homebrew – Published: 2026-08-13 17:34 – Updated: 2026-09-10 01:12 – Source website
VLAI
Summary
sigstore has CSRF possibility in OIDC authentication during signing
Details

sigstore-python is a Python tool for generating and verifying Sigstore signatures. Prior to version 4.2.0, the sigstore-python OAuth authentication flow is susceptible to Cross-Site Request Forgery. _OAuthSession creates a unique "state" and sends it as a parameter in the authentication request but the "state" in the server response seems not not be cross-checked with this value. Version 4.2.0 contains a patch for the issue.

Severity
0.0 (None)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:N
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "upstream_fixed_in": "4.2.0"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "sigstore",
        "purl": "pkg:brew/sigstore"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.5.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "git",
    "upstream_evidence": [
      {
        "ecosystem": "GIT",
        "key": "https://github.com/sigstore/sigstore-python",
        "name": "https://github.com/sigstore/sigstore-python",
        "strategy": "git",
        "subject_version": "4.5.0"
      },
      {
        "ecosystem": "PyPI",
        "key": "pkg:pypi/sigstore@4.5.0",
        "name": "sigstore",
        "strategy": "registry",
        "subject_version": "4.5.0"
      }
    ]
  },
  "details": "sigstore-python is a Python tool for generating and verifying Sigstore signatures. Prior to version 4.2.0, the sigstore-python OAuth authentication flow is susceptible to Cross-Site Request Forgery. `_OAuthSession` creates a unique \"state\" and sends it as a parameter in the authentication request but the \"state\" in the server response seems not not be cross-checked with this value. Version 4.2.0 contains a patch for the issue.",
  "id": "BREW-sigstore-CVE-2026-24408",
  "modified": "2026-09-10T01:12:53Z",
  "published": "2026-08-13T17:34:39Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sigstore/sigstore-python/releases/tag/v4.2.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/24xxx/CVE-2026-24408.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/sigstore/sigstore-python/security/advisories/GHSA-hm8f-75xx-w2vr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-24408"
    },
    {
      "type": "FIX",
      "url": "https://github.com/sigstore/sigstore-python/commit/5e77497fe8f0b202bdd118949074ec2f20da69aa"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "sigstore has CSRF possibility in OIDC authentication during signing",
  "upstream": [
    "CVE-2026-24408",
    "GHSA-hm8f-75xx-w2vr",
    "PYSEC-2026-1924"
  ]
}



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