CVE-2026-39830

Publication date 22 May 2026

Last updated 19 June 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

9.1 · Critical

Score breakdown

Description

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
golang-go.crypto 26.04 LTS resolute
Fixed 1:0.47.0-1ubuntu0.1~esm1
25.10 questing
Vulnerable
24.04 LTS noble
Fixed 1:0.19.0-1ubuntu0.1~esm2
22.04 LTS jammy
Fixed 1:0.0~git20211202.5770296-1ubuntu0.1~esm2
20.04 LTS focal
Fixed 1:0.0~git20200221.2aa609c-1ubuntu0.1~esm2
18.04 LTS bionic
Fixed 1:0.0~git20170629.0.5ef0053-2ubuntu0.1~esm2
16.04 LTS xenial
Fixed 1:0.0~git20151201.0.7b85b09-2ubuntu0.1~esm2
lxd 26.04 LTS resolute Not in release
25.10 questing Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal
Not affected
18.04 LTS bionic
Fixed 3.0.3-0ubuntu1~18.04.2+esm3
16.04 LTS xenial
Fixed 2.0.11-0ubuntu1~16.04.4+esm3
google-guest-agent 26.04 LTS resolute
Vulnerable
25.10 questing
Vulnerable
24.04 LTS noble
Vulnerable
22.04 LTS jammy
Vulnerable
20.04 LTS focal
Vulnerable
18.04 LTS bionic
Vulnerable
snapd 26.04 LTS resolute
Needs evaluation
25.10 questing
Needs evaluation
24.04 LTS noble
Needs evaluation
22.04 LTS jammy
Needs evaluation
20.04 LTS focal
Needs evaluation
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation

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Notes

jdstrand

snapd contains an embedded copy of golang-go.crypto lxd in 18.04 LTS and earlier contains an embedded copy of golang-go.crypto

hlibk

google-guest-agent contains an embedded copy of golang-go.crypto

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
golang-go.crypto

Severity score breakdown

CVSS version: CVSS v3.0

Base score 9.1 · Critical

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

References

Related Ubuntu Security Notices (USN)

Other references

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