#VU105983 Resource exhaustion in jwt - CVE-2025-30204

Vulnerability identifier: #VU105983

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-30204

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
jwt
Universal components / Libraries / Libraries used by multiple products

Vendor: golang-jwt

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources within the parse.ParseUnverified function when parsing authorization header. A remote attacker can send a specially crafted HTTP response to the application, trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

jwt: 4.0.0 - 5.2.1

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External links
https://github.com/golang-jwt/jwt/commit/0951d184286dece21f73c85673fd308786ffe9c3
https://github.com/golang-jwt/jwt/security/advisories/GHSA-mh63-6h87-95cp

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.