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CVE-2026-39830: CWE-833: Deadlock in golang.org/x/crypto golang.org/x/crypto/ssh
Severity: criticalType: vulnerabilityCVE-2026-39830
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.
EPSS 0.6%top 54%
CVE-2026-39830: CWE-833: Deadlock in golang.org/x/crypto golang.org/x/crypto/ssh
0
CriticalVulnerabilityCVE-2026-39830gcveosvubuntu-cve-2026-39830ubuntu-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-2026-39830cwe-833cwe-772
Published: 05/22/2026 (05/22/2026, 02:31:27 UTC)
Source: GCVE Database
Vendor/Project: golang.org/x/crypto
Product: golang.org/x/crypto/ssh
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.
CVSS v3.1
Score 9.1critical
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Affected software
golang-go.crypto
pkg:deb/ubuntu/golang-go.crypto@1:0.0~git20151201.0.7b85b09-2ubuntu0.1~esm2?arch=source&distro=esm-infra-legacy/xenialAffected versions
<1:0.0~git20151201.0.7b85b09-2ubuntu0.1~esm2=1:0.0~git20150608-1=1:0.0~git20151201.0.7b85b09-2=1:0.0~git20151201.0.7b85b09-2ubuntu0.1~esm1
lxd
pkg:deb/ubuntu/[email protected]~16.04.4+esm3?arch=source&distro=esm-infra-legacy/xenialAffected versions
<2.0.11-0ubuntu1~16.04.4+esm3=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
snapd
pkg:deb/ubuntu/[email protected]+esm4?arch=source&distro=esm-infra-legacy/xenialAffected 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
google-guest-agent
pkg:deb/ubuntu/[email protected]~16.04.0+esm3?arch=source&distro=esm-apps-legacy/xenialAffected versions
<20240716.00-0ubuntu1~16.04.0+esm3=20201217.02-0ubuntu1~16.04.0=20230426.00-0ubuntu2~16.04.3=20231004.02-0ubuntu1~16.04.1=20231004.02-0ubuntu1~16.04.2=20240716.00-0ubuntu1~16.04.0=20240716.00-0ubuntu1~16.04.0+esm1=20240716.00-0ubuntu1~16.04.0+esm2
lxd
pkg:deb/ubuntu/[email protected]~18.04.2+esm3?arch=source&distro=esm-infra/bionicAffected versions
<3.0.3-0ubuntu1~18.04.2+esm3=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
snapd
pkg:deb/ubuntu/[email protected]+esm4?arch=source&distro=esm-infra/bionicAffected 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
golang-go.crypto
pkg:deb/ubuntu/golang-go.crypto@1:0.0~git20170629.0.5ef0053-2ubuntu0.1~esm2?arch=source&distro=esm-apps/bionicAffected versions
<1:0.0~git20170629.0.5ef0053-2ubuntu0.1~esm2=1:0.0~git20170629.0.5ef0053-1ubuntu1=1:0.0~git20170629.0.5ef0053-1ubuntu2=1:0.0~git20170629.0.5ef0053-2=1:0.0~git20170629.0.5ef0053-2ubuntu0.1~esm1
google-guest-agent
pkg:deb/ubuntu/[email protected]~18.04.0+esm3?arch=source&distro=esm-apps/bionicAffected versions
<20241011.01-0ubuntu1~18.04.0+esm3=20201217.02-0ubuntu1~18.04.0=20210414.00-0ubuntu1~18.04.0=20210629.00-0ubuntu1~18.04.1=20220622.00-0ubuntu2~18.04.0=20220622.00-0ubuntu2~18.04.1=20230426.00-0ubuntu2~18.04.0=20231004.02-0ubuntu1~18.04.2=20231004.02-0ubuntu1~18.04.3=20240716.00-0ubuntu1~18.04.0=20241011.01-0ubuntu1~18.04.0=20241011.01-0ubuntu1~18.04.0+esm1=20241011.01-0ubuntu1~18.04.0+esm2
google-guest-agent
pkg:deb/ubuntu/[email protected]~20.04.0+esm3?arch=source&distro=esm-infra/focalAffected versions
<20250116.00-0ubuntu1~20.04.0+esm3=20201217.02-0ubuntu1~20.04.0=20210414.00-0ubuntu1~20.04.0=20210629.00-0ubuntu1~20.04.0=20220622.00-0ubuntu2~20.04.0=20220622.00-0ubuntu2~20.04.2=20230426.00-0ubuntu2~20.04.0=20231004.02-0ubuntu1~20.04.1=20231004.02-0ubuntu1~20.04.2=20231004.02-0ubuntu1~20.04.3=20231004.02-0ubuntu1~20.04.4=20240716.00-0ubuntu1~20.04.0=20241011.01-0ubuntu1~20.04.1=20250116.00-0ubuntu1~20.04.0=20250116.00-0ubuntu1~20.04.0+esm1=20250116.00-0ubuntu1~20.04.0+esm2
snapd
pkg:deb/ubuntu/[email protected]+20.04ubuntu1~esm3?arch=source&distro=esm-infra/focalAffected 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
golang-go.crypto
pkg:deb/ubuntu/golang-go.crypto@1:0.0~git20200221.2aa609c-1ubuntu0.1~esm2?arch=source&distro=esm-apps/focalAffected 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
google-guest-agent
pkg:deb/ubuntu/[email protected]~22.04.3?arch=source&distro=jammyAffected versions
<20250116.00-0ubuntu1~22.04.3=20210629.00-0ubuntu1=20210629.00-0ubuntu2=20220104.00-0ubuntu1=20220104.00-0ubuntu2=20220622.00-0ubuntu2~22.04.0=20220622.00-0ubuntu2~22.04.1=20230426.00-0ubuntu2~22.04.0=20231004.02-0ubuntu1~22.04.1=20231004.02-0ubuntu1~22.04.2=20231004.02-0ubuntu1~22.04.3=20231004.02-0ubuntu1~22.04.4=20231004.02-0ubuntu1~22.04.5=20240716.00-0ubuntu1~22.04.0=20241011.01-0ubuntu1~22.04.0=20250116.00-0ubuntu1~22.04.0=20250116.00-0ubuntu1~22.04.1=20250116.00-0ubuntu1~22.04.2
snapd
pkg:deb/ubuntu/[email protected]+ubuntu22.04.1?arch=source&distro=jammyAffected 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
golang-go.crypto
pkg:deb/ubuntu/golang-go.crypto@1:0.0~git20211202.5770296-1ubuntu0.1~esm2?arch=source&distro=esm-apps/jammyAffected 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
google-guest-agent
pkg:deb/ubuntu/[email protected]~24.04.4?arch=source&distro=nobleAffected versions
<20250116.00-0ubuntu1~24.04.4=20230426.00-0ubuntu3=20231004.02-0ubuntu1=20231004.02-0ubuntu3=20240213.00-0ubuntu1=20240213.00-0ubuntu2=20240213.00-0ubuntu3=20240213.00-0ubuntu3.1=20240213.00-0ubuntu3.2=20240716.00-0ubuntu1~24.04.0=20240716.00-0ubuntu1~24.04.1=20241011.01-0ubuntu1~24.04.0=20250116.00-0ubuntu1~24.04.0=20250116.00-0ubuntu1~24.04.1=20250116.00-0ubuntu1~24.04.2=20250116.00-0ubuntu1~24.04.3
snapd
pkg:deb/ubuntu/[email protected]+ubuntu24.04.1?arch=source&distro=nobleAffected 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
golang-go.crypto
pkg:deb/ubuntu/golang-go.crypto@1:0.19.0-1ubuntu0.1~esm2?arch=source&distro=esm-apps/nobleAffected 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
golang-go.crypto
pkg:deb/ubuntu/golang-go.crypto@1:0.25.0-1ubuntu0.1?arch=source&distro=questingAffected versions
=1:0.25.0-1=1:0.25.0-1ubuntu0.1
google-guest-agent
pkg:deb/ubuntu/[email protected]?arch=source&distro=questingAffected versions
<20250506.01-0ubuntu1.2=20250116.00-0ubuntu2=20250506.01-0ubuntu1=20250506.01-0ubuntu1.1
snapd
pkg:deb/ubuntu/[email protected]+ubuntu25.10?arch=source&distro=questingAffected 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
google-guest-agent
pkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteAffected versions
<20250506.01-0ubuntu2.1=20250506.01-0ubuntu1=20250506.01-0ubuntu2
snapd
pkg:deb/ubuntu/[email protected]+ubuntu26.04.3?arch=source&distro=resoluteAffected 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
golang-go.crypto
pkg:deb/ubuntu/golang-go.crypto@1:0.47.0-1ubuntu0.1~esm1?arch=source&distro=esm-apps/resoluteAffected 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-2026-39830
- 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: 6a5fd0891010f89cc219845a
Added to database: 07/21/2026, 20:03:21 UTC
Last updated: 07/31/2026, 21:28:51 UTC
Views: 28
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