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CVE-2026-35042

fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.1.0 and earlier, fast-jwt does not validate the crit (Critical) Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that fast-jwt does not understand, the library accepts the token instead of rejecting it. This violates the MUST requirement in the RFC.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:1e2066b18e1ce43d679e797575a4f2abdc60f612765b934df1df0ae31ad59b5f
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-636","description":"CWE-636: Not Failing Securely ('Failing Open')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:123246e054b689680b6d9d8a7856a8e67898b2c3755e787db930682524aa7736 · sha256:36d21484493c856d… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-345","description":"CWE-345: Insufficient Verification of Data Authenticity","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:123246e054b689680b6d9d8a7856a8e67898b2c3755e787db930682524aa7736 · sha256:36d21484493c856d… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"fast-jwt","vendor":"nearform","versions":[{"status":"affected","version":"<= 6.1.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:123246e054b689680b6d9d8a7856a8e67898b2c3755e787db930682524aa7736 · sha256:36d21484493c856d… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:123246e054b689680b6d9d8a7856a8e67898b2c3755e787db930682524aa7736 · sha256:36d21484493c856d… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-636","description":"CWE-636: Not Failing Securely ('Failing Open')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:123246e054b689680b6d9d8a7856a8e67898b2c3755e787db930682524aa7736 · sha256:36d21484493c856d… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-345","description":"CWE-345: Insufficient Verification of Data Authenticity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:123246e054b689680b6d9d8a7856a8e67898b2c3755e787db930682524aa7736 · sha256:36d21484493c856d… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"tags":["exploit"],"url":"https://github.com/nearform/fast-jwt/security/advisories/GHSA-hm7r-c7qw-ghp6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:123246e054b689680b6d9d8a7856a8e67898b2c3755e787db930682524aa7736 · sha256:36d21484493c856d… · /containers/adp/0/references/0
{"name":"https://github.com/nearform/fast-jwt/security/advisories/GHSA-hm7r-c7qw-ghp6","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nearform/fast-jwt/security/advisories/GHSA-hm7r-c7qw-ghp6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:123246e054b689680b6d9d8a7856a8e67898b2c3755e787db930682524aa7736 · sha256:36d21484493c856d… · /containers/cna/references/0
{"name":"https://www.rfc-editor.org/rfc/rfc7515.html#section-4.1.11","tags":["x_refsource_MISC"],"url":"https://www.rfc-editor.org/rfc/rfc7515.html#section-4.1.11"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:123246e054b689680b6d9d8a7856a8e67898b2c3755e787db930682524aa7736 · sha256:36d21484493c856d… · /containers/cna/references/1

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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