{
  "cveId": "CVE-2026-103001",
  "url": "https://patchblox.com/security/cve/CVE-2026-103001",
  "summary": "CVE-2026-103001 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-103001, released October 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "PyJWT.decode() reintroduces options-dict mutation, enabling silent claim-verification bypass on dict reuse",
  "description": "PyJWT is a Python implementation of JSON Web Token standards. From 2.11.0 through 2.13.0, PyJWT\u0027s PyJWT._merge_options() method can modify a caller-supplied mutable options mapping when verify_signature is false. If an application reuses that same mapping for a later decode() or decode_complete() call and changes verify_signature to true, the mapping can retain false values for expiration, not-before, issued-at, audience, issuer, subject, and JWT ID checks. A signed token with invalid registered claims can then be accepted without disabling signature verification, but applications that create a fresh options mapping for each call are not affected.",
  "published": "2026-09-30T22:16:33Z",
  "severity": "Moderate",
  "cvss": 6.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N",
  "cwe": "Modification of Assumed-Immutable Data (MAID)",
  "epss": 0.00257,
  "epssPercentile": 0.1744,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-103001",
  "fixes": [
    {
      "platform": "linux",
      "product": "pyjwt",
      "release": "Debian 14",
      "fixedVersion": "2.14.0-1",
      "fix": "DEBIAN-CVE-2026-103001",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-103001",
      "released": "2026-10-04T21:29:23Z"
    },
    {
      "platform": "linux",
      "product": "python-PyJWT",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "2.12.1-160000.3.1",
      "fix": "OPENSUSE-SU-2026:22074-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-22074-1",
      "released": "2026-11-07T00:47:19Z"
    },
    {
      "platform": "linux",
      "product": "python-PyJWT",
      "release": "sles 16.0",
      "fixedVersion": "2.12.1-160000.3.1",
      "fix": "SUSE-SU-2026:24219-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-24219-1",
      "released": "2026-11-07T00:44:01Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-10T07:50:38Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}