When parsing a Range header containing a large number of small ranges, FileServer(FS), ServeContent, and ServeFile(FS) can consume an excessive amount of CPU.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Go standard library net/http unaffected
Version Status Constraints
0 affected < 1.26.9
1.27.0-0 affected < 1.27.2

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Go Standard Library Subscribe
Net/http Subscribe

Project Subscriptions

Vendors Products
Go Standard Library Subscribe
Net/http Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://go.dev/cl/847309 cve-icon cve-icon cve-icon
https://go.dev/issue/81858 cve-icon cve-icon cve-icon
https://groups.google.com/g/golang-announce/c/U2fTuyDJznI cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-78667 cve-icon
https://pkg.go.dev/vuln/GO-2026-6609 cve-icon cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-78667 cve-icon
History

Fri, 09 Oct 2026 04:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400

Fri, 09 Oct 2026 03:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400

Fri, 09 Oct 2026 02:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400

Fri, 09 Oct 2026 01:30:00 +0000

Type Values Removed Values Added
First Time appeared Go Standard Library
Go Standard Library net/http
Vendors & Products Go Standard Library
Go Standard Library net/http

Fri, 09 Oct 2026 00:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400

Fri, 09 Oct 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Important

Thu, 08 Oct 2026 23:00:00 +0000

Type Values Removed Values Added
Description When parsing a Range header containing a large number of small ranges, FileServer(FS), ServeContent, and ServeFile(FS) can consume an excessive amount of CPU.
Title Lack of limit on size of parsed Range headers in net/http
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2026-10-08T22:53:59.148Z

Reserved: 2026-08-24T23:36:15.738Z

Link: CVE-2026-78667

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-08T23:17:03.880

Modified: 2026-10-08T23:17:03.880

Link: CVE-2026-78667

cve-icon Redhat

Severity : Important

Publid Date: 2026-10-08T22:53:59Z

Links: CVE-2026-78667 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-09T07:00:12Z

Weaknesses