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CVE-2026-48525

PyJWT is a JSON Web Token implementation in Python. From 2.8.0 to 2.12.1, when verifying detached JWS tokens using the unencoded-payload option ("b64": false, RFC 7797), PyJWT performs Base64URL decoding of the compact-serialization payload segment before enforcing the detached-payload rules. For b64=false, PyJWT later discards that decoded payload and replaces it with the caller-provided detached_payload. In practice, this turns the middle segment into an attacker-controlled “work amplifier”: a
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:58adb1df8af52e86483988c2e084445b6b0726624528505061204b68a35caad6
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"pyjwt","vendor":"jpadilla","versions":[{"status":"affected","version":">= 2.8.0, < 2.13.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c99724f7ba6cbebb67cc68ad3593bd109ed2ff6dd1f52231bb6ccd584334adcc · sha256:c2a6293c3e072b47… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c99724f7ba6cbebb67cc68ad3593bd109ed2ff6dd1f52231bb6ccd584334adcc · sha256:c2a6293c3e072b47… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c99724f7ba6cbebb67cc68ad3593bd109ed2ff6dd1f52231bb6ccd584334adcc · sha256:c2a6293c3e072b47… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/jpadilla/pyjwt/security/advisories/GHSA-w7vc-732c-9m39","tags":["x_refsource_CONFIRM"],"url":"https://github.com/jpadilla/pyjwt/security/advisories/GHSA-w7vc-732c-9m39"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c99724f7ba6cbebb67cc68ad3593bd109ed2ff6dd1f52231bb6ccd584334adcc · sha256:c2a6293c3e072b47… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/jpadilla/pyjwt/security/advisories/GHSA-w7vc-732c-9m39"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c99724f7ba6cbebb67cc68ad3593bd109ed2ff6dd1f52231bb6ccd584334adcc · sha256:c2a6293c3e072b47… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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