CVE-2026-35041

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Source
https://cve.org/CVERecord?id=CVE-2026-35041
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-35041.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-35041
Aliases
Published
2026-04-09T14:55:22.807Z
Modified
2026-07-08T08:09:28.006981201Z
Severity
  • 4.2 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
Summary
ReDoS in fast-jwt when using RegExp in allowed* leading to CPU exhaustion during token verification
Details

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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35041.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-1333"
    ]
}
References

Affected packages

Git / github.com/nearform/fast-jwt

Affected ranges

Type
GIT
Repo
https://github.com/nearform/fast-jwt
Events
Introduced
72f91b547f5dca90715a70ff3cbaa042e40d8803
Fixed
6b13fe96614a38613d453f46ba0631c4cd09dcd8
Fixed
b0be0ca161593836a153d5180ca5358ad9b5de94
Database specific 
{
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:nearform:fast-jwt:*:*:*:*:*:node.js:*:*",
    "extracted_events": [
        {
            "introduced": "5.0.0"
        },
        {
            "fixed": "6.2.1"
        }
    ]
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-35041.json"