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CVE-2026-39830

43
FAUCET Score

A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connection. Unsolicited global responses are now discarded.

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

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.62%
Probability of exploitation in next 30 days
EPSS Percentile
46.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0062 is in the 27th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (29)

gopatch availablevia ghsa
Product: golang.org/x/cryptoFixed in: 0.52.0
microsoftpatch availablevia msrc
Product: 21418-17084Fixed in: 25.0.3-18
microsoftpatch availablevia msrc
Product: azl3 nvidia-container-toolkit 1.17.8-2 on Azure Linux 3.0Fixed in: 1.17.8-3
microsoftpatch availablevia msrc
Product: 20433-17084Fixed in: 1.17.8-3
microsoftpatch availablevia msrc
Product: 20966-17084Fixed in: 1.9.5-14
microsoftpatch availablevia msrc
Product: 21258-17084Fixed in: 1.31.0-21
microsoftpatch availablevia msrc
Product: azl3 telegraf 1.31.0-19 on Azure Linux 3.0Fixed in: 1.31.0-21
microsoftpatch availablevia msrc
Product: azl3 packer 1.9.5-13 on Azure Linux 3.0Fixed in: 1.9.5-14
microsoftpatch availablevia msrc
Product: 21378-17084Fixed in: 1.30.10-25
microsoftpatch availablevia msrc
Product: 20984-17084Fixed in: 1.12.15-8
microsoftpatch availablevia msrc
Product: 20985-17084Fixed in: 8.7.11-6
microsoftpatch availablevia msrc
Product: 21271-17084Fixed in: 0.14.0-13
microsoftpatch availablevia msrc
Product: 21272-17084Fixed in: 2.27.0-11
microsoftpatch availablevia msrc
Product: 21278-17084Fixed in: 2.62.0-16
microsoftpatch availablevia msrc
Product: 21256-17084Fixed in: 1.30.10-25
microsoftpatch availablevia msrc
Product: 21299-17084Fixed in: 1.7.1-5
microsoftpatch availablevia msrc
Product: 21274-17084Fixed in: 25.0.3-18
microsoftpatch availablevia msrc
Product: azl3 cf-cli 8.7.11-5 on Azure Linux 3.0Fixed in: 8.7.11-6
microsoftpatch availablevia msrc
Product: azl3 docker-buildx 0.14.0-11 on Azure Linux 3.0Fixed in: 0.14.0-13
microsoftpatch availablevia msrc
Product: azl3 kubernetes 1.30.10-25 on Azure Linux 3.0Fixed in: 1.30.10-25
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 docker-compose 2.27.0-9 on Azure Linux 3.0Fixed in: 2.27.0-11
microsoftpatch availablevia msrc
Product: azl3 gh 2.62.0-15 on Azure Linux 3.0Fixed in: 2.62.0-16
microsoftpatch availablevia msrc
Product: azl3 kubernetes 1.30.10-23 on Azure Linux 3.0Fixed in: 1.30.10-25
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 moby-engine 25.0.3-17 on Azure Linux 3.0Fixed in: 25.0.3-18
microsoftpatch availablevia msrc
Product: azl3 moby-engine 25.0.3-18 on Azure Linux 3.0Fixed in: 25.0.3-18
ubuntupatch availablevia ubuntu_usn
Product: lxd (bionic)Fixed in: 3.0.3-0ubuntu1~18.04.2+esm3
ubuntupatch availablevia ubuntu_usn
Product: lxd (xenial)Fixed in: 2.0.11-0ubuntu1~16.04.4+esm3

Vendor Advisories (3)

goGHSA-vgwf-h737-ff37critical

golang.org/x/crypto: Invoking client can cause server deadlock on unexpected responses

Jun 25, 2026
ubuntuUSN-8447-2

LXD vulnerabilities

Jun 18, 2026
microsoft2026-May/CVE-2026-39830Important

Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh

May 12, 2026

References

access.redhat.com / errata/RHSA-2026:29455
access.redhat.com / errata/RHSA-2026:35833
access.redhat.com / errata/RHSA-2026:36199
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-2026:37072
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-2026:37275
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-2026:41066
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-2026-39830
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-39830.json
go.dev / cl/781640
Issue Tracking
go.dev / cl/781664
Issue Tracking
go.dev / issue/79564
Issue Tracking
groups.google.com / g/golang-announce/c/a082jnz-LvI
Mailing List
pkg.go.dev / vuln/GO-2026-5017
Vendor Advisory