# CVE-2025-58186

## Summary

- **CVE ID:** CVE-2025-58186
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
- **CWE:** N/A
- **Published:** Oct 29, 2025
- **Last Modified:** Sep 14, 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 Products

- Go standard library — net/http (0)
- Go standard library — net/http (1.25.0)

## References

- [CNA](https://go.dev/issue/75672)
- [CNA](https://go.dev/cl/709855)
- [CNA](https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI)
- [CNA](https://pkg.go.dev/vuln/GO-2025-4012)
- [CVE](http://www.openwall.com/lists/oss-security/2025/10/08/1)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.53%
- **EPSS Percentile:** 43.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._