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CVE intelligence

CVE-2025-30204

Vulnerability intelligence

Published Mar 21, 2025Sources checked Nov 14, 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

Vendor revision: Aug 12, 2026
Vendor remediation details

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
EPSS0.8%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.

Source: NVD