Lack of limit when parsing cookies can cause memory exhaustion in net/http

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-58186
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-10-29 23:16:19 UTC
Updated2026-10-11 20:10:00 UTC
DescriptionDespite 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Problem Types: CWE-400: Uncontrolled Resource Consumption

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go Standard Library Net/http affected 1.24.8 semver Not specified
CNA Go Standard Library Net/http affected 1.25.0 1.25.2 semver Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2025/10/08/1 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
go.dev/issue/75672 [email protected] go.dev
groups.google.com/g/golang-announce/c/4Emdl2iQ_bI [email protected] groups.google.com
pkg.go.dev/vuln/GO-2025-4012 [email protected] pkg.go.dev
go.dev/cl/709855 [email protected] go.dev
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: jub0bs (en)

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