Excessive Cookie Parsing Vulnerability in Go HTTP Server
CVE-2025-58186

5.3MEDIUM

Key Information:

Vendor

Go Standard Library

Status
Net/http
Vendor
CVE Published:
29 October 2025

What is CVE-2025-58186?

An issue exists in the Go HTTP server where the default 1MB limit on HTTP headers does not apply to the number of cookies that can be parsed. Attackers can exploit this by sending numerous small cookies, which can lead to significant memory consumption on the server. This could potentially degrade server performance or cause denial of service due to resource exhaustion.

Affected Version(s)

net/http 0 < 1.24.8

net/http 1.25.0 < 1.25.2

References

https://go.dev/issue/75672
https://go.dev/cl/709855
https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

jub0bs
JSON
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