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CVE-2026-35040

fast-jwt provides fast JSON Web Token (JWT) implementation. Prior to 6.2.1, using certain modifiers on RegExp objects in the allowedAud, allowedIss, allowedSub, allowedJti, or allowedNonce options in verify functions can cause certain unintended behaviours. This is because some modifiers are stateful and will cause failures in every second verification attempt regardless of the validity of the token provided. Such modifiers are /g (global matching) and /y (sticky matching). This does NOT allow i
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f5eb4695bd3b4828f7f0c7e2edf51d88215a05210d635ad84d99ea24f36e0211
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-697","description":"CWE-697: Incorrect Comparison","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:74f99813a906764016d98b5f05f9cb8a17393484136223289b29db2b930efe48 · sha256:696e805b47cf275d… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-440","description":"CWE-440: Expected Behavior Violation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:74f99813a906764016d98b5f05f9cb8a17393484136223289b29db2b930efe48 · sha256:696e805b47cf275d… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"fast-jwt","vendor":"nearform","versions":[{"status":"affected","version":"< 6.2.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:74f99813a906764016d98b5f05f9cb8a17393484136223289b29db2b930efe48 · sha256:696e805b47cf275d… · /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:v2:74f99813a906764016d98b5f05f9cb8a17393484136223289b29db2b930efe48 · sha256:696e805b47cf275d… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-697","description":"CWE-697: Incorrect Comparison","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:74f99813a906764016d98b5f05f9cb8a17393484136223289b29db2b930efe48 · sha256:696e805b47cf275d… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-440","description":"CWE-440: Expected Behavior Violation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:74f99813a906764016d98b5f05f9cb8a17393484136223289b29db2b930efe48 · sha256:696e805b47cf275d… · /containers/cna/problemTypes/1/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/nearform/fast-jwt/commit/18d25904e4617e8753526d1b3ab5a2cccdea726a","tags":["x_refsource_MISC"],"url":"https://github.com/nearform/fast-jwt/commit/18d25904e4617e8753526d1b3ab5a2cccdea726a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:74f99813a906764016d98b5f05f9cb8a17393484136223289b29db2b930efe48 · sha256:696e805b47cf275d… · /containers/cna/references/2
{"name":"https://github.com/nearform/fast-jwt/pull/593","tags":["x_refsource_MISC"],"url":"https://github.com/nearform/fast-jwt/pull/593"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:74f99813a906764016d98b5f05f9cb8a17393484136223289b29db2b930efe48 · sha256:696e805b47cf275d… · /containers/cna/references/1
{"name":"https://github.com/nearform/fast-jwt/releases/tag/v6.2.1","tags":["x_refsource_MISC"],"url":"https://github.com/nearform/fast-jwt/releases/tag/v6.2.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:74f99813a906764016d98b5f05f9cb8a17393484136223289b29db2b930efe48 · sha256:696e805b47cf275d… · /containers/cna/references/3
{"name":"https://github.com/nearform/fast-jwt/security/advisories/GHSA-3j8v-cgw4-2g6q","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nearform/fast-jwt/security/advisories/GHSA-3j8v-cgw4-2g6q"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:74f99813a906764016d98b5f05f9cb8a17393484136223289b29db2b930efe48 · sha256:696e805b47cf275d… · /containers/cna/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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