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EPSS 0.6%top 55%

CVE-2026-39832: CWE-281: Improper Preservation of Permissions in golang.org/x/crypto golang.org/x/crypto/ssh/agent

0
Critical
VulnerabilityCVE-2026-39832gcveosvubuntu-cve-2026-39832ubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-22-04-ltsubuntu-pro-22-04-ltsubuntu-24-04-ltsubuntu-pro-24-04-ltsubuntu-25-10ubuntu-26-04-ltsubuntu-pro-26-04-ltscve-2026-39832cwe-281
Published: 05/22/2026 (05/22/2026, 02:31:26 UTC)
Source: GCVE Database
Vendor/Project: golang.org/x/crypto
Product: golang.org/x/crypto/ssh/agent

Description

When adding a key to a remote agent constraint extensions such as [email protected] were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all constraint extensions. Additionally, the in-memory keyring returned by NewKeyring() now rejects keys with unsupported constraint extensions instead of silently ignoring them.

CVSS v3.1

Score 9.1critical

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected software

Ubuntu:Pro:16.04:LTSmore threats →ghsa
lxd
pkg:deb/ubuntu/[email protected]~16.04.4+esm3?arch=source&distro=esm-infra-legacy/xenial
Affected versions
=0.20-0ubuntu4=0.21-0ubuntu3=0.21-0ubuntu5=0.22-0ubuntu1=0.22-0ubuntu2=0.23-0ubuntu1=0.23-0ubuntu2=0.23-0ubuntu3=0.24-0ubuntu2=0.24-0ubuntu3=0.24-0ubuntu4=0.25-0ubuntu1=0.26-0ubuntu2=0.26-0ubuntu3=0.27-0ubuntu1=0.27-0ubuntu2=2.0.0~beta1-0ubuntu3=2.0.0~beta1-0ubuntu4=2.0.0~beta2-0ubuntu1=2.0.0~beta2-0ubuntu2=2.0.0~beta3-0ubuntu1=2.0.0~beta3-0ubuntu2=2.0.0~beta3-0ubuntu3=2.0.0~beta3-0ubuntu4=2.0.0~beta4-0ubuntu1=2.0.0~beta4-0ubuntu2=2.0.0~beta4-0ubuntu3=2.0.0~beta4-0ubuntu4=2.0.0~beta4-0ubuntu5=2.0.0~beta4-0ubuntu6=2.0.0~beta4-0ubuntu7=2.0.0~rc1-0ubuntu1=2.0.0~rc1-0ubuntu2=2.0.0~rc1-0ubuntu3=2.0.0~rc2-0ubuntu2=2.0.0~rc2-0ubuntu3=2.0.0~rc3-0ubuntu1=2.0.0~rc3-0ubuntu2=2.0.0~rc3-0ubuntu3=2.0.0~rc3-0ubuntu4=2.0.0~rc4-0ubuntu1=2.0.0~rc5-0ubuntu1=2.0.0~rc6-0ubuntu1=2.0.0~rc6-0ubuntu2=2.0.0~rc7-0ubuntu1=2.0.0~rc7-0ubuntu2=2.0.0~rc8-0ubuntu1=2.0.0~rc8-0ubuntu2=2.0.0~rc8-0ubuntu3=2.0.0~rc8-0ubuntu5=2.0.0~rc8-0ubuntu6=2.0.0~rc8-0ubuntu7=2.0.0~rc9-0ubuntu2=2.0.0~rc9-0ubuntu3=2.0.0~rc9-0ubuntu4=2.0.0~rc9-0ubuntu5=2.0.0-0ubuntu1=2.0.0-0ubuntu2=2.0.0-0ubuntu3=2.0.0-0ubuntu4=2.0.1-0ubuntu1~16.04.1=2.0.2-0ubuntu1~16.04.1=2.0.3-0ubuntu1~ubuntu16.04.2=2.0.4-0ubuntu1~ubuntu16.04.1=2.0.5-0ubuntu1~ubuntu16.04.1=2.0.8-0ubuntu1~ubuntu16.04.1=2.0.8-0ubuntu1~ubuntu16.04.2=2.0.9-0ubuntu1~16.04.1=2.0.9-0ubuntu1~16.04.2=2.0.10-0ubuntu1~16.04.1=2.0.10-0ubuntu1~16.04.2=2.0.11-0ubuntu1~16.04.2=2.0.11-0ubuntu1~16.04.4=2.0.11-0ubuntu1~16.04.4+esm1=2.0.11-0ubuntu1~16.04.4+esm2=2.0.11-0ubuntu1~16.04.4+esm3
Ubuntu:Pro:16.04:LTSmore threats →ghsa
snapd
pkg:deb/ubuntu/[email protected]+esm4?arch=source&distro=esm-infra-legacy/xenial
Affected versions
=1.9=1.9.1.1=1.9.2=2.0=2.0.1=2.0.2=2.0.3=2.0.5=2.0.8=2.0.9=2.0.10=2.11+0.16.04=2.12+0.16.04=2.13=2.14.2~16.04=2.15.2ubuntu1=2.16ubuntu3=2.17.1ubuntu1=2.20.1ubuntu1=2.21=2.22.2=2.22.3=2.22.6=2.23.1=2.24.1=2.25=2.26.10=2.27.5=2.28.5=2.29.4.2=2.32.3.2=2.32.9=2.33.1ubuntu2=2.34.2=2.34.2ubuntu0.1=2.37.4=2.37.4ubuntu0.1=2.38=2.39.2=2.39.2ubuntu0.2=2.40=2.42.1=2.45.1=2.45.1ubuntu0.2=2.46.1=2.47.1=2.48=2.48.3=2.54.3+16.04~esm2=2.54.3+16.04.0ubuntu0.1~esm3=2.54.3+16.04.0ubuntu0.1~esm4=2.54.3+16.04.0ubuntu0.1~esm5=2.54.3+16.04.0ubuntu0.1~esm6=2.61.4ubuntu0.16.04.1+esm1=2.61.4ubuntu0.16.04.1+esm2=2.61.4ubuntu0.16.04.1+esm4
Ubuntu:Pro:18.04:LTSmore threats →ghsa
lxd
pkg:deb/ubuntu/[email protected]~18.04.2+esm3?arch=source&distro=esm-infra/bionic
Affected versions
=2.18-0ubuntu6=2.19-0ubuntu1=2.20-0ubuntu3=2.20-0ubuntu4=2.21-0ubuntu1=2.21-0ubuntu2=2.21-0ubuntu3=2.21-0ubuntu4=3.0.0~beta2-0ubuntu3=3.0.0~beta3-0ubuntu3=3.0.0~beta5-0ubuntu2=3.0.0~beta7-0ubuntu1=3.0.0-0ubuntu1=3.0.0-0ubuntu2=3.0.0-0ubuntu3=3.0.0-0ubuntu4=3.0.1-0ubuntu1~18.04.1=3.0.2-0ubuntu1~18.04.1=3.0.3-0ubuntu1~18.04.1=3.0.3-0ubuntu1~18.04.2=3.0.3-0ubuntu1~18.04.2+esm1=3.0.3-0ubuntu1~18.04.2+esm2=3.0.3-0ubuntu1~18.04.2+esm3
Ubuntu:Pro:18.04:LTSmore threats →ghsa
snapd
pkg:deb/ubuntu/[email protected]+esm4?arch=source&distro=esm-infra/bionic
Affected versions
=2.28.5+17.10=2.29.4.1+18.04=2.29.4.2+18.04=2.31.1+18.04=2.32+18.04~pre5=2.32+18.04~pre6=2.32+18.04=2.32.3.2+18.04=2.32.5+18.04=2.32.8+18.04=2.32.9+18.04=2.33.1+18.04ubuntu2=2.34.2+18.04=2.34.2+18.04.1=2.37.1+18.04=2.37.1.1+18.04=2.37.4+18.04=2.37.4+18.04.1=2.38+18.04=2.39.2+18.04=2.40+18.04=2.42.1+18.04=2.45.1+18.04=2.45.1+18.04.2=2.46.1+18.04=2.47.1+18.04=2.48+18.04=2.48.3+18.04=2.49.2+18.04=2.51.1+18.04=2.54.2+18.04ubuntu1=2.54.3+18.04=2.54.3+18.04.2ubuntu0.1=2.54.3+18.04.2ubuntu0.2=2.55.5+18.04=2.57.5+18.04=2.57.5+18.04ubuntu0.1=2.58+18.04=2.58+18.04.1=2.61.4ubuntu0.18.04.1+esm1=2.61.4ubuntu0.18.04.1+esm2=2.61.4ubuntu0.18.04.1+esm4
Ubuntu:Pro:20.04:LTSmore threats →ghsa
snapd
pkg:deb/ubuntu/[email protected]+20.04ubuntu1~esm3?arch=source&distro=esm-infra/focal
Affected versions
=2.41+19.10.1=2.42.1+20.04=2.43.3+git1.8109f8=2.44~pre1+20.04=2.44+20.04=2.44.2+20.04=2.44.3+20.04=2.45.1+20.04=2.45.1+20.04.2=2.46.1+20.04=2.47.1+20.04=2.48+20.04=2.48.3+20.04=2.49.2+20.04=2.51.1+20.04ubuntu2=2.54.2+20.04ubuntu2=2.54.3+20.04=2.54.3+20.04.1=2.54.3+20.04.1ubuntu0.1=2.54.3+20.04.1ubuntu0.2=2.54.3+20.04.1ubuntu0.3=2.55.5+20.04=2.57.5+20.04=2.57.5+20.04ubuntu0.1=2.58+20.04=2.58+20.04.1=2.61.3+20.04=2.62+20.04=2.63+20.04=2.63+20.04ubuntu0.1=2.65.3+20.04=2.66.1+20.04=2.67.1+20.04=2.67.1+20.04ubuntu1~esm1=2.67.1+20.04ubuntu1~esm3
Ubuntu:Pro:20.04:LTSmore threats →ghsa
golang-go.crypto
pkg:deb/ubuntu/golang-go.crypto@1:0.0~git20200221.2aa609c-1ubuntu0.1~esm2?arch=source&distro=esm-apps/focal
Affected versions
<1:0.0~git20200221.2aa609c-1ubuntu0.1~esm2=1:0.0~git20190701.4def268-2=1:0.0~git20200221.2aa609c-1=1:0.0~git20200221.2aa609c-1ubuntu0.1~esm1
Ubuntu:22.04:LTSmore threats →ghsa
snapd
pkg:deb/ubuntu/[email protected]+ubuntu22.04.1?arch=source&distro=jammy
Affected versions
=2.53+21.10ubuntu1=2.54.2+22.04ubuntu1=2.54.2+22.04ubuntu2=2.54.2+22.04ubuntu3=2.54.3+git19.g868fc21+22.04=2.54.3+git26.g360067e+22.04=2.55.2+22.04=2.55.2+22.04.1=2.55.3+22.04=2.55.3+22.04ubuntu1=2.55.5+22.04=2.56.2+22.04ubuntu1=2.57.4+22.04=2.57.5+22.04=2.57.5+22.04ubuntu0.1=2.58+22.04=2.58+22.04.1=2.61.3+22.04=2.62+22.04=2.63+22.04=2.63+22.04ubuntu0.1=2.65.3+22.04=2.66.1+22.04=2.67.1+22.04=2.68.5+ubuntu22.04.1=2.71+ubuntu22.04=2.72+ubuntu22.04=2.73+ubuntu22.04=2.73+ubuntu22.04.1=2.74.1+ubuntu22.04.4=2.75.2+ubuntu22.04=2.76+ubuntu22.04=2.76+ubuntu22.04.1
Ubuntu:Pro:22.04:LTSmore threats →ghsa
golang-go.crypto
pkg:deb/ubuntu/golang-go.crypto@1:0.0~git20211202.5770296-1ubuntu0.1~esm2?arch=source&distro=esm-apps/jammy
Affected versions
<1:0.0~git20211202.5770296-1ubuntu0.1~esm2=1:0.0~git20201221.eec23a3-1=1:0.0~git20211202.5770296-1=1:0.0~git20211202.5770296-1ubuntu0.1~esm1
Ubuntu:24.04:LTSmore threats →ghsa
snapd
pkg:deb/ubuntu/[email protected]+ubuntu24.04.1?arch=source&distro=noble
Affected versions
=2.60.4+23.10=2.61.3+24.04=2.62+24.04build1=2.63+24.04=2.63+24.04ubuntu0.1=2.63.1+24.04=2.65.3+24.04=2.66.1+24.04=2.67.1+24.04=2.68.5+ubuntu24.04.1=2.71+ubuntu24.04=2.72+ubuntu24.04=2.73+ubuntu24.04=2.73+ubuntu24.04.1=2.73+ubuntu24.04.2=2.74.1+ubuntu24.04.4=2.75.2+ubuntu24.04=2.76+ubuntu24.04=2.76+ubuntu24.04.1
Ubuntu:Pro:24.04:LTSmore threats →ghsa
golang-go.crypto
pkg:deb/ubuntu/golang-go.crypto@1:0.19.0-1ubuntu0.1~esm2?arch=source&distro=esm-apps/noble
Affected versions
<1:0.19.0-1ubuntu0.1~esm2=1:0.4.0-1=1:0.17.0-1=1:0.18.0-1=1:0.19.0-1=1:0.19.0-1ubuntu0.1~esm1
Ubuntu:25.10more threats →ghsa
golang-go.crypto
pkg:deb/ubuntu/golang-go.crypto@1:0.25.0-1ubuntu0.1?arch=source&distro=questing
Affected versions
=1:0.25.0-1=1:0.25.0-1ubuntu0.1
Ubuntu:25.10more threats →ghsa
snapd
pkg:deb/ubuntu/[email protected]+ubuntu25.10?arch=source&distro=questing
Affected versions
=2.67.1+25.04=2.68.5+ubuntu25.10.2=2.71+ubuntu25.10=2.71.1+ubuntu25.10.1=2.72+ubuntu25.10.2=2.73+ubuntu25.10=2.73+ubuntu25.10.1=2.74.1+ubuntu25.10.4=2.75.2+ubuntu25.10
Ubuntu:26.04:LTSmore threats →ghsa
snapd
pkg:deb/ubuntu/[email protected]+ubuntu26.04.3?arch=source&distro=resolute
Affected versions
=2.71.1+ubuntu25.10.1=2.72+ubuntu26.04.1=2.73+ubuntu26.04.1=2.74+ubuntu26.04=2.74.1+ubuntu26.04=2.74.1+ubuntu26.04.3=2.74.1+ubuntu26.04.4=2.75.2+ubuntu26.04.2=2.76+ubuntu26.04.2=2.76+ubuntu26.04.3
Ubuntu:Pro:26.04:LTSmore threats →ghsa
golang-go.crypto
pkg:deb/ubuntu/golang-go.crypto@1:0.47.0-1ubuntu0.1~esm1?arch=source&distro=esm-apps/resolute
Affected versions
<1:0.47.0-1ubuntu0.1~esm1=1:0.25.0-1=1:0.45.0-1=1:0.47.0-1

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-39832
Osv Schema Version
1.7.0
Aliases
[]
Ecosystems
["Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS","Ubuntu:Pro:26.04:LTS"]
Database Specific Severity
null
Cvss Version
3.1

Threat ID: 6a5fd0891010f89cc2198445

Added to database: 07/21/2026, 20:03:21 UTC

Last updated: 07/31/2026, 19:30:14 UTC

Views: 26

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