CVE-2025-58186
Lack of limit when parsing cookies can cause memory exhaustion in net/http
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.
INFO
Published Date :
Oct. 29, 2025, 11:16 p.m.
Last Modified :
Oct. 29, 2025, 11:16 p.m.
Remotely Exploit :
No
Source :
[email protected]
Solution
- Configure the server to limit the number of cookies.
- Implement a cookie parsing limit in the application.
- Reject requests with too many cookies.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-58186.
| URL | Resource |
|---|---|
| https://go.dev/cl/709855 | |
| https://go.dev/issue/75672 | |
| https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI | |
| https://pkg.go.dev/vuln/GO-2025-4012 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-58186 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-58186
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-58186 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-58186 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by [email protected]
Oct. 29, 2025
Action Type Old Value New Value Added 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. Added Reference https://go.dev/cl/709855 Added Reference https://go.dev/issue/75672 Added Reference https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI Added Reference https://pkg.go.dev/vuln/GO-2025-4012