{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2021-41106",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-41106",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2021-09-28T20:50:11.000Z",
    "updatedAt": "2024-08-04T02:59:31.511Z",
    "importedAt": "2026-10-24T01:56:32.228Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "File reference keys leads to incorrect hashes on HMAC algorithms",
      "summary": "JWT is a library to work with JSON Web Token and JSON Web Signature. Prior to versions 3.4.6, 4.0.4, and 4.1.5, users of HMAC-based algorithms (HS256, HS384, and HS512) combined with `Lcobucci\\JWT\\Signer\\Key\\LocalFileReference` as key are having their tokens issued/validated using the file path as hashing key - instead of the contents. The HMAC hashing functions take any string as input and, since users can issue and validate tokens, users are lead to believe that everything works properly. Versions 3.4.6, 4.0.4, and 4.1.5 have been patched to always load the file contents, deprecated the `Lcobucci\\JWT\\Signer\\Key\\LocalFileReference`, and suggest `Lcobucci\\JWT\\Signer\\Key\\InMemory` as the alternative. As a workaround, use `Lcobucci\\JWT\\Signer\\Key\\InMemory` instead of `Lcobucci\\JWT\\Signer\\Key\\LocalFileReference` to create the instances of one's keys.",
      "affected": [
        {
          "vendor": "lcobucci",
          "product": "jwt",
          "versions": [
            {
              "version": ">= 3.4.0, < 3.4.6",
              "status": "affected"
            },
            {
              "version": ">= 4.0.0, < 4.0.4",
              "status": "affected"
            },
            {
              "version": ">= 4.1.0, < 4.1.5",
              "status": "affected"
            }
          ]
        }
      ]
    }
  }
}