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CVE-2026-42499

Quadratic string concatenation in consumePhrase in net/mail

Published: May 7, 2026Updated: Aug 6, 2026 Sources: CVE List NVD BDUNVD-CWE-noinfo
7.5HIGH
NVD MITRE
EPSS Score
0.8%
Top 46.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

NVD-CWE-noinfoCWE-1046

Affected Products

golang
oss-project·US
go
OSS Libraries
The Go Project
oss-projectaka crypto, go, golang-google-protobuf
Go
OSS Libraries
Go standard library
oss-project·USaka net/http, html/template, golang standard library, crypto/x509
net/mailLibraryLibrary
OSS Libraries / generic-library

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-42499?We can run the check for you — a free external exposure review, no install. Check my exposure

References

https://go.dev/cl/771520
go.dev
https://go.dev/issue/78987
go.dev
https://groups.google.com/g/golang-announce/c/qcCIEXso47M
groups.google.com
and 30 more references View all →

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