CVE-2026-35042

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-35042
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-35042.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-35042
Aliases
Published
2026-04-06T17:02:12.180Z
Modified
2026-07-08T08:12:59.066035899Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
Summary
fast-jwt accepts unknown `crit` header extensions (RFC 7515 §4.1.11 MUST violation)
Details

fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.1.0 and earlier, fast-jwt does not validate the crit (Critical) Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that fast-jwt does not understand, the library accepts the token instead of rejecting it. This violates the MUST requirement in the RFC.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35042.json",
    "cwe_ids": [
        "CWE-345",
        "CWE-636"
    ],
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/nearform/fast-jwt

Affected ranges

Type
GIT
Repo
https://github.com/nearform/fast-jwt
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
e07b1fd23f02a47f1be677a21a4f07607b478e66
Database specific 
{
    "cpe": "cpe:2.3:a:nearform:fast-jwt:*:*:*:*:*:node.js:*:*",
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "6.1.0"
        },
        {
            "fixed": "6.2.0"
        }
    ]
}

Affected versions

v0.*
v0.1.0
v0.1.1
v0.2.0
v0.3.0
v0.3.1
v0.4.0
v0.4.1
v0.4.2
v0.5.0
v0.5.1
v1.*
v1.0.0
v1.1.0
v1.1.1
v1.1.2
v1.1.3
v1.2.0
v1.3.0
v1.3.2
v1.4.0
v1.4.1
v1.5.0
v1.5.1
v1.5.2
v1.5.3
v1.5.4
v1.6.0
v1.6.1
v1.7.0
v1.7.1
v1.7.2
v2.*
v2.0.0
v6.*
v6.1.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-35042.json"