UnratedFix available

DEBIAN-CVE-2026-48524

Type: advisorySource: OSV1 source record

PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, PyJWKClient.get_signing_key() forces a fresh HTTP request to the JWKS endpoint for every JWT with an unknown kid value, with no rate limiting. Since kid comes from the unverified token header, an attacker can trigger unlimited outbound requests. The vulnerability surfaces only when a JWKS fetch fails; an attacker can attempt to provoke that with sustained unknown-kid traffic, but the outcome depends on upstream JWKS-endpoint behavior (rate limiting, transient errors) which is beyond the attacker's control. This vulnerability is fixed in 2.13.0.

Announced 28 May 2026Group revision 1

Original source ↗

DEBIAN-CVE-2026-48524

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-48524

pyjwt

Source reference: /affected/0/package/name

Affected versions: 2.10.1-1
Source reference: /affected/0/versions
2.10.1-2
Source reference: /affected/0/versions
2.10.1-3
Source reference: /affected/0/versions
2.10.1-4
Source reference: /affected/0/versions
2.11.0-2
Source reference: /affected/0/versions
2.12.1-1
Source reference: /affected/0/versions
2.13.0-1
Source reference: /affected/0/versions
2.14.0-1
Source reference: /affected/0/versions
2.15.0-1
Source reference: /affected/0/versions
2.15.1-1
Source reference: /affected/0/versions
2.6.0-1
Source reference: /affected/0/versions
2.6.0-1+deb12u1
Source reference: /affected/0/versions
2.7.0-1
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

pyjwt

Source reference: /affected/1/package/name

Affected versions: 2.10.1-2
Source reference: /affected/1/versions
2.10.1-2+deb13u1
Source reference: /affected/1/versions
2.10.1-3
Source reference: /affected/1/versions
2.10.1-4
Source reference: /affected/1/versions
2.11.0-2
Source reference: /affected/1/versions
2.12.1-1
Source reference: /affected/1/versions
2.13.0-1
Source reference: /affected/1/versions
2.14.0-1
Source reference: /affected/1/versions
2.15.0-1
Source reference: /affected/1/versions
2.15.1-1
Source reference: /affected/1/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

pyjwt

Source reference: /affected/2/package/name

Affected versions: 2.10.1-2
Source reference: /affected/2/versions
2.10.1-3
Source reference: /affected/2/versions
2.10.1-4
Source reference: /affected/2/versions
2.11.0-2
Source reference: /affected/2/versions
2.12.1-1
Source reference: /affected/2/versions
Fixed versions: 2.13.0-1
Source reference: /affected/2/ranges
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "pyjwt",
      "purl": "pkg:deb/debian/pyjwt?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "2.10.1-1",
      "2.10.1-2",
      "2.10.1-3",
      "2.10.1-4",
      "2.11.0-2",
      "2.12.1-1",
      "2.13.0-1",
      "2.14.0-1",
      "2.15.0-1",
      "2.15.1-1",
      "2.6.0-1",
      "2.6.0-1+deb12u1",
      "2.7.0-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48524.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "pyjwt",
      "purl": "pkg:deb/debian/pyjwt?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "2.10.1-2",
      "2.10.1-2+deb13u1",
      "2.10.1-3",
      "2.10.1-4",
      "2.11.0-2",
      "2.12.1-1",
      "2.13.0-1",
      "2.14.0-1",
      "2.15.0-1",
      "2.15.1-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48524.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.13.0-1"
          }
        ]
      }
    ],
    "package": {
      "name": "pyjwt",
      "purl": "pkg:deb/debian/pyjwt?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "2.10.1-2",
      "2.10.1-3",
      "2.10.1-4",
      "2.11.0-2",
      "2.12.1-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48524.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #57166 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 17:04:38 GMT
Publisher date: Thu, 28 May 2026 16:16:29 GMT

Read the original announcement

Revision history

25 Oct 2026DEBIAN-CVE-2026-48524 · Revision 1Source updated