CVE-2025-58186
MEDIUM5.3EPSS 0.04%Lack of limit when parsing cookies can cause memory exhaustion in net/http
Published: 10/29/2025Modified: 5/15/2026
Description
Despite HTTP headers having a default limit of 1MB, the number of cookies that can be parsed does not have a limit. By sending a lot of very small cookies such as "a=;", an attacker can make an HTTP server allocate a large amount of structs, causing large memory consumption.
Affected packages (6)
- Bitnami/golangfrom 0, < 1.24.8, >= 1.25.0, < 1.25.2
- Debian/golang-1.15from 0
- Debian/golang-1.19from 0
- Debian/golang-1.24from 0
- Debian/golang-1.25from 0, < 1.25.2-1
- Go/stdlibfrom 0, < 1.24.8, >= 1.25.0, < 1.25.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
References (7)
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2025-58186
- PATCHhttps://go.dev/cl/709855
- REPORThttps://go.dev/issue/75672
- WEBhttps://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI
- WEBhttps://nvd.nist.gov/vuln/detail/CVE-2025-58186
- WEBhttps://pkg.go.dev/vuln/GO-2025-4012
- WEBhttp://www.openwall.com/lists/oss-security/2025/10/08/1