ghsa-vm9r-h74p-hg97

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "<= 0.3.5",
        "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-vm9r-h74p-hg97/GHSA-vm9r-h74p-hg97.json"
      },
      "package": {
        "ecosystem": "Pub",
        "name": "jose",
        "purl": "pkg:pub/jose"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.3.5+1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1.0",
        "0.1.0+1",
        "0.1.0+2",
        "0.1.1",
        "0.1.2",
        "0.1.2+1",
        "0.2.0",
        "0.2.1",
        "0.2.1+1",
        "0.2.2",
        "0.3.0",
        "0.3.0-nullsafety.1",
        "0.3.0-nullsafety.2",
        "0.3.1",
        "0.3.2",
        "0.3.3",
        "0.3.4",
        "0.3.5"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-34240"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-31T23:09:16Z",
    "nvd_published_at": "2026-03-31T16:16:33Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nA vulnerability in `jose` versions up to and including `0.3.5` could allow an unauthenticated, remote attacker to forge valid JWS/JWT tokens by using a key embedded in the JOSE header (`jwk`).  \n\nThe vulnerability exists because key selection could treat header-provided `jwk` as a verification candidate even when that key was not present in the trusted key store. Since JOSE headers are untrusted input, an attacker could exploit this by creating a token payload, embedding an attacker-controlled public key in the header, and signing with the matching private key.  \n\nApplications using affected versions for token verification are impacted.\n\n### Patches\n\nUpgrade to `0.3.5+1` or later.\n\n### Workarounds\n\nReject tokens where header `jwk` is present unless that `jwk` matches a key already present in the application's trusted key store.\n\n### Resources\n\nFix commit: [fix: improved key resolution in JsonWebKeyStore](https://github.com/appsup-dart/jose/commit/b07799aac1f56a9a21483feac026272aab30cc5d)",
  "id": "GHSA-vm9r-h74p-hg97",
  "modified": "2026-03-31T23:26:27.178816Z",
  "published": "2026-03-31T23:09:16Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/appsup-dart/jose/security/advisories/GHSA-vm9r-h74p-hg97"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34240"
    },
    {
      "type": "WEB",
      "url": "https://github.com/appsup-dart/jose/commit/b07799aac1f56a9a21483feac026272aab30cc5d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/appsup-dart/jose"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "jose vulnerable to untrusted JWK header key acceptance during signature verification"
}