Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The jwt-go library (Go packages github.com/golang-jwt/jwt/v5 from 5.0.0-rc.1 before 5.2.2, github.com/golang-jwt/jwt/v4 before 4.5.2, and github.com/golang-jwt/jwt before 3.2.2 for the 3.2.x line) allocates memory in proportion to the length of an untrusted token during header parsing. A remote attacker can send a request whose Authorization header contains many period characters after "Bearer" to cause excessive memory allocation. Upgrade to v5.2.2 or v4.5.2; the source lists no fixed version for github.com/golang-jwt/jwt.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.5 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0081, the 57th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:14 UTC First seen by agentprime
- 31 Oct 2026, 14:14 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-mh63-6h87-95cp
- OSV: GHSA-mh63-6h87-95cp
- github.com/golang-jwt/jwt/security/advisories/GHSA-mh63-6h87-95cp
- nvd.nist.gov/vuln/detail/CVE-2025-30204
- github.com/golang-jwt/jwt/commit/0951d184286dece21f73c85673fd308786ffe9c3
- github.com/golang-jwt/jwt/commit/bf316c48137a1212f8d0af9288cc9ce8e59f1afb
- github.com/golang-jwt/jwt
- security.netapp.com/advisory/ntap-20250404-0002