HOMEVULNERABILITIESCVE-2026-35041
MEDIUM

CVE-2026-35041

CWE-1333Published: April 9, 2026· Updated: Apr 14, 2026

6.5
CVSS v3.1
EPSS:0.03%probability of exploitation in 30 daysPercentile:8.8th

Official Description

fast-jwt provides fast JSON Web Token (JWT) implementation. From 5.0.0 to 6.2.0, a denial-of-service condition exists in fast-jwt when the allowedAud verification option is configured using a regular expression. Because the aud claim is attacker-controlled and the library evaluates it against the supplied RegExp, a crafted JWT can trigger catastrophic backtracking in the JavaScript regex engine, resulting in significant CPU consumption during verification. This vulnerability is fixed in 6.2.1.

NVD Source

Technical Analysis

CVE-2026-35041 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

nearform1 product
fast-jwt
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/nearform/fast-jwt/commit/b0be0ca161593836a153d5180ca5358ad9b5de94
PATCHhttps://github.com/nearform/fast-jwt/pull/595
ADVISORYhttps://github.com/nearform/fast-jwt/security/advisories/GHSA-cjw9-ghj4-fwxf
ADVISORYhttps://github.com/nearform/fast-jwt/security/advisories/GHSA-cjw9-ghj4-fwxf

All References (5)

→
https://github.com/nearform/fast-jwt/commit/b0be0ca161593836a153d5180ca5358ad9b5de94Patch
→
https://github.com/nearform/fast-jwt/pull/595Issue Tracking · Patch
→
https://github.com/nearform/fast-jwt/releases/tag/v6.2.1Product · Release Notes
→
https://github.com/nearform/fast-jwt/security/advisories/GHSA-cjw9-ghj4-fwxfExploit · Mitigation · Vendor Advisory
→
https://github.com/nearform/fast-jwt/security/advisories/GHSA-cjw9-ghj4-fwxfExploit · Mitigation · Vendor Advisory

Quick Facts

CVE IDCVE-2026-35041
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-1333
CISA KEVNo
EPSS (30d)0.03%
Affected1 vendor
PublishedApr 9, 2026

Related CVEs (CWE-1333)

CVE-2026-35458
9.8
CVE-2026-47138
8.7
CVE-2026-41040
8.7
CVE-2026-33079
8.7
CVE-2026-35213
8.7
CVE-2026-22178
8.2

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-35041 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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