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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-39820

37
FAUCET Score

Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations.

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
0.78%
Probability of exploitation in next 30 days
EPSS Percentile
52.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0078 is in the 28th percentile among its peer group of 51,506 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-2026-39820Important

Quadratic string concatentation in consumeComment in net/mail

May 7, 2026

References

access.redhat.com / errata/RHSA-2026:23262
access.redhat.com / errata/RHSA-2026:23264
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-2026-39820
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-39820.json
go.dev / cl/759940
Patch
go.dev / issue/78566
Issue Tracking
groups.google.com / g/golang-announce/c/qcCIEXso47M
Issue TrackingMailing List
pkg.go.dev / vuln/GO-2026-4986
Vendor Advisory