GHSA-mh63-6h87-95cp CVE-2025-30204 GO-2025-3553
jwt-go allows excessive memory allocation during header parsing
- Severity
- 0.0 / 10
- High · CVSS 4.0
- Exploit chance (EPSS)
- 0.81%
- Chance of exploitation in the next 30 days. Higher than 56.96% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-405 Asymmetric Resource Consumption (Amplification)
- Fix
- Available
- 2 packages have a fixed version
Description
Summary
Function parse.ParseUnverified currently 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. Relevant weakness: CWE-405: Asymmetric Resource Consumption (Amplification)
Details
Impact
Excessive memory allocation
Affected versions
Go
| Package | Vulnerable | Fixed in |
|---|---|---|
| github.com/golang-jwt/jwt | >= 3.2.0, <= 3.2.2 |
No fix yet |
| github.com/golang-jwt/jwt | all versions |
No fix yet |
| github.com/golang-jwt/jwt/v4 | < 4.5.2 |
4.5.2 |
| github.com/golang-jwt/jwt/v5 | >= 5.0.0-rc.1, < 5.2.2 |
5.2.2 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
github.com/golang-jwt/jwt/v4 Go → 4.5.2
- go
go get github.com/golang-jwt/jwt/v4@v4.5.2 && go mod tidy
github.com/golang-jwt/jwt/v5 Go → 5.2.2
- go
go get github.com/golang-jwt/jwt/v5@v5.2.2 && go mod tidy
Severity breakdown
CVSS 4.0 0.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- None
- User interaction
- None
- Confidentiality (vulnerable system)
- None
- Integrity (vulnerable system)
- None
- Availability (vulnerable system)
- High
- Confidentiality (subsequent systems)
- None
- Integrity (subsequent systems)
- None
- Availability (subsequent systems)
- None
CVSS 3.1 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Weakness
CWE-405: Asymmetric Resource Consumption (Amplification)
The product does not properly control situations in which an adversary can cause the product to consume or produce excessive resources without requiring the adversary to invest equivalent work or otherwise prove authorization, i.e., the adversary's influence is "asymmetric."
How to prevent it
- Architecture and Design: An application must make resources available to a client commensurate with the client's access level.
- Architecture and Design: An application must, at all times, keep track of allocated resources and meter their usage appropriately.
- System Configuration: Consider disabling resource-intensive algorithms on the server side, such as Diffie-Hellman key exchange.
References
Advisories
Packages
Other links
- github.com/golang-jwt/jwt/security/advisories/GHSA-mh63-6h87-95cp
- github.com/golang-jwt/jwt/commit/0951d184286dece21f73c85673fd308786ffe9c3
- github.com/golang-jwt/jwt/commit/bf316c48137a1212f8d0af9288cc9ce8e59f1afb
- security.netapp.com/advisory/ntap-20250404-0002
- security.netapp.com/advisory/ntap-20250404-0002
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-29wx-vh33-7x7r Bad documentation of error handling in ParseWithClaims can lead to potentially dangerous situations | Low | Also affects github.com/golang-jwt/jwt/v4 |
| GHSA-4vqv-7265-gm2w pypdf has possible large memory usage for exceptions in strict mode | High | Same weakness, CWE-405 |
| GHSA-g3hv-75wg-m249 minimatch has potential denial of service via globparts amplification | Medium | Same weakness, CWE-405 |
| GHSA-9fm3-97px-rjf6 undici WebSocket client vulnerable to Denial of Service via unbounded automatic PONG buffering | High | Same weakness, CWE-405 |
| GHSA-7hqp-7c5m-4vq6 Microsoft Security Advisory CVE-2026-96960 - .NET and Visual Studio Denial of Service Vulnerability | High | Same weakness, CWE-405 |
| GO-2026-6607 Reject malformed ECH outer extension references in crypto/tls | High | Same weakness, CWE-405 |
| GO-2026-6611 Excessive CPU consumption from repeated initial window changes in net/http | High | Same weakness, CWE-405 |
| GO-2026-6603 HTTP/2 server memory exhaustion due to Trailer headers in net/http | High | Same weakness, CWE-405 |
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