Incorrect parsing of IPv6 host literals in net/url

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-25679
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-06 22:16:00 UTC
Updated2026-04-21 14:43:03 UTC
Descriptionurl.Parse insufficiently validated the host/authority component and accepted some invalid URLs.

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: 0.000510000 probability, percentile 0.158810000 (date 2026-04-21)

Problem Types: CWE-425 | CWE-1286: Improper Validation of Syntactic Correctness of Input

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Golang Go All All All All
Application Golang Go 1.26.0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go Standard Library Net/url affected 1.25.8 semver Not specified
CNA Go Standard Library Net/url affected 1.26.0-0 1.26.1 semver Not specified

References

ReferenceSourceLinkTags
go.dev/issue/77578 [email protected] go.dev Issue Tracking
pkg.go.dev/vuln/GO-2026-4601 [email protected] pkg.go.dev Vendor Advisory
groups.google.com/g/golang-announce/c/EdhZqrQ98hk [email protected] groups.google.com Release Notes
go.dev/cl/752180 [email protected] go.dev Mailing List
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: Masaki Hara (https://github.com/qnighy) of Wantedly (en)

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