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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-42499

37
FAUCET Score

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

First published: May 7, 2026Last modified: May 8, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 1.25.10CPE matchmatch criteria
cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
>= 1.26.0, < 1.26.3CPE matchmatch criteria
cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.80%
Probability of exploitation in next 30 days
EPSS Percentile
52.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0080 is in the 28th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

microsoft2026-May/CVE-2026-42499Important

Quadratic string concatenation in consumePhrase in net/mail

May 7, 2026

References

access.redhat.com / errata/RHSA-2026:17713
access.redhat.com / errata/RHSA-2026:17714
access.redhat.com / errata/RHSA-2026:33120
access.redhat.com / errata/RHSA-2026:33123
access.redhat.com / errata/RHSA-2026:33142
access.redhat.com / errata/RHSA-2026:33150
access.redhat.com / errata/RHSA-2026:33574
access.redhat.com / errata/RHSA-2026:34364
access.redhat.com / errata/RHSA-2026:36319
access.redhat.com / errata/RHSA-2026:36625
access.redhat.com / errata/RHSA-2026:36754
access.redhat.com / errata/RHSA-2026:36797
access.redhat.com / errata/RHSA-2026:40262
access.redhat.com / errata/RHSA-2026:41031
access.redhat.com / errata/RHSA-2026:41066
access.redhat.com / errata/RHSA-2026:41928
access.redhat.com / errata/RHSA-2026:42146
access.redhat.com / errata/RHSA-2026:42644
access.redhat.com / errata/RHSA-2026:42796
access.redhat.com / errata/RHSA-2026:43038
access.redhat.com / errata/RHSA-2026:43052
access.redhat.com / errata/RHSA-2026:43692
access.redhat.com / security/cve/CVE-2026-42499
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-42499.json
go.dev / cl/771520
Patch
go.dev / issue/78987
Issue Tracking
groups.google.com / g/golang-announce/c/qcCIEXso47M
Release Notes
pkg.go.dev / vuln/GO-2026-4977
Vendor Advisory