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PyJWT: Non-canonical signature segments enable raw-token revocation bypass

Type: advisorySource: Official CVE List1 source record

PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT signature segment is affected because signature segment decoding accepts characters outside the canonical Base64URL representation. This occurs when non-Base64URL characters are appended to a valid compact JWS signature segment. As a result, base64url_decode produces the same signature bytes for different serialized segments. Consequently, raw-token revocation checks can fail to recognize an equivalent modified token. This issue is fixed in version 2.14.0.

Announced Source revision 1
Original source ↗

CVE-2026-102269

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: cve:CVE-2026-102269

pyjwt

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "jpadilla",
    "product": "pyjwt",
    "versions": [
      {
        "status": "affected",
        "version": "< 2.14.0"
      }
    ]
  }
]
Related CVEs
CVE-2026-102269

Source reference: /cveMetadata/cveId

Publisher severity

medium

Source reference: /containers/cna/metrics

Event
#3452 · Revision 1
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Publisher date
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