UBUNTU-CVE-2026-101917 (CVE-2026-101917)

Vulnerability from osv_ubuntu – Published: 2026-09-28 21:17 – Updated: 2026-09-30 21:41 – Source website
VLAI
Details

PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT get_signing_key_from_jwt is affected because unknown kid misses force refreshes without a negative cache or minimum refresh interval. This occurs when unauthenticated tokens repeatedly use the same unknown kid or varying kid values absent from the cached JWKS. As a result, each cache miss causes PyJWKClient to refresh the JWKS. Consequently, attacker traffic can amplify outbound requests to the configured JWKS endpoint. This issue is fixed in version 2.14.0.

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-jwt",
            "binary_version": "1.3.0-1ubuntu0.1+esm2"
          },
          {
            "binary_name": "python3-jwt",
            "binary_version": "1.3.0-1ubuntu0.1+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "pyjwt",
        "purl": "pkg:deb/ubuntu/pyjwt@1.3.0-1ubuntu0.1+esm2?arch=source\u0026distro=esm-infra-legacy/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.0-0ubuntu1",
        "1.3.0-1",
        "1.3.0-1ubuntu0.1",
        "1.3.0-1ubuntu0.1+esm1",
        "1.3.0-1ubuntu0.1+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-jwt",
            "binary_version": "1.5.3+ds1-1ubuntu0.1+esm2"
          },
          {
            "binary_name": "python3-jwt",
            "binary_version": "1.5.3+ds1-1ubuntu0.1+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "pyjwt",
        "purl": "pkg:deb/ubuntu/pyjwt@1.5.3+ds1-1ubuntu0.1+esm2?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.2-1.1",
        "1.5.3+ds1-1",
        "1.5.3+ds1-1ubuntu0.1",
        "1.5.3+ds1-1ubuntu0.1+esm1",
        "1.5.3+ds1-1ubuntu0.1+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-jwt",
            "binary_version": "1.7.1-2ubuntu2.1+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "pyjwt",
        "purl": "pkg:deb/ubuntu/pyjwt@1.7.1-2ubuntu2.1+esm2?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.7.0-2",
        "1.7.1-1",
        "1.7.1-2ubuntu1",
        "1.7.1-2ubuntu2",
        "1.7.1-2ubuntu2.1",
        "1.7.1-2ubuntu2.1+esm1",
        "1.7.1-2ubuntu2.1+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-jwt",
            "binary_version": "2.3.0-1ubuntu0.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "pyjwt",
        "purl": "pkg:deb/ubuntu/pyjwt@2.3.0-1ubuntu0.4?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.7.1-2ubuntu2",
        "2.1.0-1",
        "2.3.0-1",
        "2.3.0-1ubuntu0.1",
        "2.3.0-1ubuntu0.2",
        "2.3.0-1ubuntu0.3",
        "2.3.0-1ubuntu0.4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-jwt",
            "binary_version": "2.7.0-1ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "pyjwt",
        "purl": "pkg:deb/ubuntu/pyjwt@2.7.0-1ubuntu0.2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.7.0-1",
        "2.7.0-1ubuntu0.1",
        "2.7.0-1ubuntu0.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-jwt",
            "binary_version": "2.10.1-4ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "pyjwt",
        "purl": "pkg:deb/ubuntu/pyjwt@2.10.1-4ubuntu1.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.10.1-2",
        "2.10.1-3",
        "2.10.1-3build1",
        "2.10.1-4",
        "2.10.1-4ubuntu1",
        "2.10.1-4ubuntu1.1"
      ]
    }
  ],
  "aliases": [],
  "details": "PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT get_signing_key_from_jwt is affected because unknown kid misses force refreshes without a negative cache or minimum refresh interval. This occurs when unauthenticated tokens repeatedly use the same unknown kid or varying kid values absent from the cached JWKS. As a result, each cache miss causes PyJWKClient to refresh the JWKS. Consequently, attacker traffic can amplify outbound requests to the configured JWKS endpoint. This issue is fixed in version 2.14.0.",
  "id": "UBUNTU-CVE-2026-101917",
  "modified": "2026-09-30T21:41:53Z",
  "published": "2026-09-28T21:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-101917"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-101917"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/jpadilla/pyjwt/security/advisories/GHSA-2gx3-rcp4-g85q"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/jpadilla/pyjwt/commit/ba4853a75fb9676362da17f67d0f64bd18afd4e1"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/jpadilla/pyjwt/releases/tag/2.14.0"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-101917"
  ]
}



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