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01 Record

CVE-2026-107720

fast-jwt: createVerifier accepts unsigned JWTs when key is '' or null and algorithms is explicitly set

HighPUBLISHEDCNA: GitHub_M
CNA base score7.4 CVSS v3.xCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
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02 Description

fast-jwt: createVerifier accepts unsigned JWTs when key is '' or null and algorithms is explicitly set

03 Exploitation and scoring

Exploitation
Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.
SSVC decision
  • ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.32% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 25.1% of scored records. A rank, not a probability.
NVD base score
7.4 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD analysis status
Deferred. NVD last modified this record on 2026-10-09.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-10-08 21:44Z20 DAYS AGO
Last updated
2026-10-09 14:32Z20 DAYS AGO
Reserved
2026-10-08
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
High (CVSS 7.4)
CNA CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weaknesses
  • CWE-20Improper Input ValidationClass
  • CWE-347Improper Verification of Cryptographic SignatureBase
Data version
5.2
Document digest
270449d2ac306e1dddeaa188c8fd6656034968054c5e2d2f54684e22458c7950

05 Affected products

VendorProductVersionsPlatforms
nearformfast-jwt< 6.3.1—

06 References