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CVE-2026-39828

41
FAUCET Score

When an SSH server authentication callback returned PartialSuccessError with non-nil Permissions, those permissions were silently discarded, potentially dropping certificate restrictions such as force-command after a second factor succeeded. Returning non-nil Permissions with PartialSuccessError now results in a connection error.

First published: May 22, 2026Last modified: May 22, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 0.52.0CPE matchmatch criteria
cpe:2.3:a:golang:crypto:*:*:*:*:*:go:*:*

CVSS Data

CVSS version used by this source: 3.1

6.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.8
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.37%
Probability of exploitation in next 30 days
EPSS Percentile
29.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0037 is in the 17th percentile among its peer group of 17,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 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

Patch Available

Vendor Patches (21)

gopatch availablevia ghsa
Product: golang.org/x/cryptoFixed in: 0.52.0
microsoftpatch availablevia msrc
Product: 21399-17084Fixed in: 2.62.0-17
microsoftpatch availablevia msrc
Product: azl3 telegraf 1.31.0-22 on Azure Linux 3.0Fixed in: 1.31.0-23
microsoftpatch availablevia msrc
Product: azl3 cert-manager 1.12.15-6 on Azure Linux 3.0Fixed in: 1.12.15-8
microsoftpatch availablevia msrc
Product: azl3 kubevirt 1.7.1-2 on Azure Linux 3.0Fixed in: 1.7.1-5
microsoftpatch availablevia msrc
Product: azl3 packer 1.9.5-13 on Azure Linux 3.0Fixed in: 1.9.5-14
microsoftpatch availablevia msrc
Product: azl3 telegraf 1.31.0-23 on Azure Linux 3.0Fixed in: 1.31.0-23
microsoftpatch availablevia msrc
Product: azl3 cf-cli 8.7.11-7 on Azure Linux 3.0Fixed in: 8.7.11-7
microsoftpatch availablevia msrc
Product: azl3 cf-cli 8.7.11-6 on Azure Linux 3.0Fixed in: 8.7.11-7
microsoftpatch availablevia msrc
Product: azl3 gh 2.62.0-17 on Azure Linux 3.0Fixed in: 2.62.0-17
microsoftpatch availablevia msrc
Product: azl3 gh 2.62.0-18 on Azure Linux 3.0Fixed in: 2.62.0-17
microsoftpatch availablevia msrc
Product: azl3 gh 2.62.0-16 on Azure Linux 3.0Fixed in: 2.62.0-17
microsoftpatch availablevia msrc
Product: 21402-17084Fixed in: 8.7.11-7
microsoftpatch availablevia msrc
Product: 20984-17084Fixed in: 1.12.15-8
microsoftpatch availablevia msrc
Product: 21299-17084Fixed in: 1.7.1-5
microsoftpatch availablevia msrc
Product: 20966-17084Fixed in: 1.9.5-14
microsoftpatch availablevia msrc
Product: 21481-17084Fixed in: 1.31.0-23
microsoftpatch availablevia msrc
Product: 21505-17084Fixed in: 8.7.11-7
microsoftpatch availablevia msrc
Product: 21503-17084Fixed in: 2.62.0-17
microsoftpatch availablevia msrc
Product: 21395-17084Fixed in: 1.31.0-23
microsoftpatch availablevia msrc
Product: 21555-17084Fixed in: 2.62.0-17

Vendor Advisories (2)

goGHSA-45gg-vh54-h5m9medium

golang.org/x/crypto vulnerable to invoking bypass of certificate restrictions

Jun 25, 2026
microsoft2026-May/CVE-2026-39828Moderate

Invoking bypass of certificate restrictions in golang.org/x/crypto/ssh

May 12, 2026

References

access.redhat.com / errata/RHSA-2026:26546
access.redhat.com / errata/RHSA-2026:26547
access.redhat.com / errata/RHSA-2026:36105
access.redhat.com / errata/RHSA-2026:36167
access.redhat.com / errata/RHSA-2026:36207
access.redhat.com / errata/RHSA-2026:36319
access.redhat.com / errata/RHSA-2026:36625
access.redhat.com / errata/RHSA-2026:36648
access.redhat.com / errata/RHSA-2026:36651
access.redhat.com / errata/RHSA-2026:36796
access.redhat.com / errata/RHSA-2026:36797
access.redhat.com / errata/RHSA-2026:36808
access.redhat.com / errata/RHSA-2026:37268
access.redhat.com / errata/RHSA-2026:37271
access.redhat.com / errata/RHSA-2026:37272
access.redhat.com / errata/RHSA-2026:37278
access.redhat.com / errata/RHSA-2026:37286
access.redhat.com / errata/RHSA-2026:37296
access.redhat.com / errata/RHSA-2026:37387
access.redhat.com / errata/RHSA-2026:40118
access.redhat.com / errata/RHSA-2026:40262
access.redhat.com / errata/RHSA-2026:40945
access.redhat.com / errata/RHSA-2026:40969
access.redhat.com / errata/RHSA-2026:40972
access.redhat.com / errata/RHSA-2026:40974
access.redhat.com / errata/RHSA-2026:41019
access.redhat.com / errata/RHSA-2026:41031
access.redhat.com / errata/RHSA-2026:41036
access.redhat.com / errata/RHSA-2026:41055
access.redhat.com / errata/RHSA-2026:41066
access.redhat.com / errata/RHSA-2026:42146
access.redhat.com / errata/RHSA-2026:42796
access.redhat.com / errata/RHSA-2026:43052
access.redhat.com / errata/RHSA-2026:43692
access.redhat.com / security/cve/CVE-2026-39828
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-39828.json
go.dev / cl/781621
Issue Tracking
go.dev / issue/79562
Issue Tracking
groups.google.com / g/golang-announce/c/a082jnz-LvI
Mailing List
pkg.go.dev / vuln/GO-2026-5014
Vendor Advisory