Lack of limit on size of parsed Range headers in net/http

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-78667
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-08 23:17:03 UTC
Updated2026-10-09 17:16:49 UTC
DescriptionWhen parsing a Range header containing a large number of small ranges, FileServer(FS), ServeContent, and ServeFile(FS) can consume an excessive amount of CPU.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

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

EPSS: 0.003790000 probability, percentile 0.299550000 (date 2026-10-11)

Problem Types: CWE-770 | CWE-770: Allocation of Resources Without Limits or Throttling | CWE-770 CWE-770 Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go Standard Library Net/http affected 1.26.9 semver Not specified
CNA Go Standard Library Net/http affected 1.27.0-0 1.27.2 semver Not specified

References

ReferenceSourceLinkTags
pkg.go.dev/vuln/GO-2026-6609 [email protected] pkg.go.dev
groups.google.com/g/golang-announce/c/U2fTuyDJznI [email protected] groups.google.com
go.dev/cl/847309 [email protected] go.dev
go.dev/issue/81858 [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: Jakub Ciolek (https://ciolek.dev) (en)

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