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CVE-2025-30204— jwt-go allows excessive memory allocation during header parsing

Quick assessment

Affected
golang-jwt jwt
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

jwt-go是golang-jwt开源的一个Go语言的JWT实现。 jwt-go 5.2.2之前版本和4.5.2之前版本存在安全漏洞，该漏洞源于parse.ParseUnverified函数在处理恶意请求时可能导致内存分配问题。

CVSS 7.5 · High EPSS 0.72% · P52

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2025-30204

Vulnerability Information
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Vulnerability Title
jwt-go allows excessive memory allocation during header parsing
Source: CVE Program / CVE List V5
Vulnerability Description
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不对称的资源消耗(放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
jwt-go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
jwt-go是golang-jwt开源的一个Go语言的JWT实现。 jwt-go 5.2.2之前版本和4.5.2之前版本存在安全漏洞，该漏洞源于parse.ParseUnverified函数在处理恶意请求时可能导致内存分配问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
golang-jwt jwt >= 3.2.0, < 4.5.2 -

II. Public POCs for CVE-2025-30204

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8161 chars
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III. Intelligence Information for CVE-2025-30204

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Patches & Fixes for CVE-2025-30204 (1)

Vendor Advisories for CVE-2025-30204 (1)

IV. Related Vulnerabilities

Same product: jwt
Same vendor: golang-jwt
Same weakness: CWE-405

V. Comments for CVE-2025-30204

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