CVE intelligence

CVE-2025-30204

Vulnerability intelligence

Published Mar 21, 2025Sources checked Sep 30, 2026

7.5HIGHCVSS out of 10

What this means

Review the available evidence

CVE-2025-30204 and is rated High severity with a CVSS score of 7.5. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

CBL-Mariner Releases

Vendor-listed releases

0.24.2-12
3.5.21-1
1.11.4-5
1.31.0-7
1.9.5-7
1.30.10-4
10.25.1-5
1.11.2-21
1.29.4-13
1.9.5-12
1.28.4-16
2.37.9-3
1.11.1-16
1.3.2-24
24.0.9-16
1.7.7-2
2.14.1-5
25.0.3-12
2.3.2-2
10.25.1-3
1.12.15-3
2.45.4-9

CISA KEVNot listedBased on the latest collected catalog

EPSS0.7%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2025-30204?

golang-jwt is a Go implementation of JSON Web Tokens. Starting in version 3.2.0 and prior to versions 5.2.2 and 4.5.2, the function parse.ParseUnverified splits (via a call to strings.Split) its argument (which is untrusted data) on periods. As a result, in the face of a malicious request whose Authorization header consists of Bearer followed by many period characters, a call to that function incurs allocations to the tune of O(n) bytes (where n stands for the length of the function's argument), with a constant factor of about 16. This issue is fixed in 5.2.2 and 4.5.2.