Quadratic string concatenation in consumePhrase in net/mail

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Summary

CVECVE-2026-42499
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-07 20:16:44 UTC
Updated2026-05-13 16:59:17 UTC
DescriptionPathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.

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: 0.000230000 probability, percentile 0.065470000 (date 2026-05-12)

Problem Types: NVD-CWE-noinfo | CWE-407: Inefficient Algorithmic Complexity

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go Standard Library Net/mail affected 1.25.10 semver Not specified
CNA Go Standard Library Net/mail affected 1.26.0-0 1.26.3 semver Not specified

References

ReferenceSourceLinkTags
go.dev/issue/78987 [email protected] go.dev Issue Tracking
go.dev/cl/771520 [email protected] go.dev Patch
pkg.go.dev/vuln/GO-2026-4977 [email protected] pkg.go.dev Vendor Advisory
groups.google.com/g/golang-announce/c/qcCIEXso47M [email protected] groups.google.com Release Notes
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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