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CVE-2026-44351

fast-jwt provides fast JSON Web Token (JWT) implementation. Prior to 6.2.4, a critical authentication-bypass vulnerability in fast-jwt's async key-resolver flow allows any unauthenticated attacker to forge arbitrary JWTs that are accepted as authentic. When the application's key resolver returns an empty string (''), for example via the common keys[decoded.header.kid] || '' JWKS-style fallback, fast-jwt converts it to a zero-length Buffer, hands it to crypto.createSecretKey, derives allowedAlgor
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:5946d6a6f013ff719a1f7e02f646d5fba103a9757d239ce948329655b1ee33de
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 3 assertions

{"cweId":"CWE-1391","description":"CWE-1391: Use of Weak Credentials","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3ed1c4bf0d5c7e87fc8ad681ca2cab8b71f1ee37abaf9acefc6321e56d3cb7cc · sha256:89460b9992cd09ec… · /containers/cna/problemTypes/2/descriptions/0

{"cweId":"CWE-326","description":"CWE-326: Inadequate Encryption Strength","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3ed1c4bf0d5c7e87fc8ad681ca2cab8b71f1ee37abaf9acefc6321e56d3cb7cc · sha256:89460b9992cd09ec… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3ed1c4bf0d5c7e87fc8ad681ca2cab8b71f1ee37abaf9acefc6321e56d3cb7cc · sha256:89460b9992cd09ec… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"fast-jwt","vendor":"nearform","versions":[{"status":"affected","version":"< 6.2.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3ed1c4bf0d5c7e87fc8ad681ca2cab8b71f1ee37abaf9acefc6321e56d3cb7cc · sha256:89460b9992cd09ec… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3ed1c4bf0d5c7e87fc8ad681ca2cab8b71f1ee37abaf9acefc6321e56d3cb7cc · sha256:89460b9992cd09ec… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

3 source assertions
{"cweId":"CWE-1391","description":"CWE-1391: Use of Weak Credentials","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3ed1c4bf0d5c7e87fc8ad681ca2cab8b71f1ee37abaf9acefc6321e56d3cb7cc · sha256:89460b9992cd09ec… · /containers/cna/problemTypes/2/descriptions/0
{"cweId":"CWE-326","description":"CWE-326: Inadequate Encryption Strength","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3ed1c4bf0d5c7e87fc8ad681ca2cab8b71f1ee37abaf9acefc6321e56d3cb7cc · sha256:89460b9992cd09ec… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3ed1c4bf0d5c7e87fc8ad681ca2cab8b71f1ee37abaf9acefc6321e56d3cb7cc · sha256:89460b9992cd09ec… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/nearform/fast-jwt/security/advisories/GHSA-gmvf-9v4p-v8jc","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nearform/fast-jwt/security/advisories/GHSA-gmvf-9v4p-v8jc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3ed1c4bf0d5c7e87fc8ad681ca2cab8b71f1ee37abaf9acefc6321e56d3cb7cc · sha256:89460b9992cd09ec… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/nearform/fast-jwt/security/advisories/GHSA-gmvf-9v4p-v8jc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3ed1c4bf0d5c7e87fc8ad681ca2cab8b71f1ee37abaf9acefc6321e56d3cb7cc · sha256:89460b9992cd09ec… · /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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