CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2025-30204
High (7.5). EPSS 0.8% chance of exploitation in the next 30 days. Fixed in github.com/golang-jwt/jwt/v5 5.2.2.
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.
Severity
- EPSS
- 0.8% chance of exploitation in the next 30 days; higher than 56% of CVEs (scores of 2026-11-01)
- CWE
- CWE-405
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-mh63-6h87-95cp | Go | github.com/golang-jwt/jwt/v5 | >=5.0.0-rc.1 <5.2.2 | 5.2.2 |
| GHSA-mh63-6h87-95cp | Go | github.com/golang-jwt/jwt/v4 | <4.5.2 | 4.5.2 |
| GHSA-mh63-6h87-95cp | Go | github.com/golang-jwt/jwt | >=3.2.0 <=3.2.2 | no fix published |
| GO-2025-3553 | Go | github.com/golang-jwt/jwt | all versions | no fix published |
| GO-2025-3553 | Go | github.com/golang-jwt/jwt/v4 | <4.5.2 | 4.5.2 |
| GO-2025-3553 | Go | github.com/golang-jwt/jwt/v5 | >=5.0.0-rc.1 <5.2.2 | 5.2.2 |