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Golang go.crypto: When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the…
Severity: criticalType: vulnerabilityCVE-2026-39834
When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation.
EPSS 0.5%top 58%
Golang go.crypto: When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the…
0
CriticalVulnerabilityCVE-2026-39834gcveosvubuntu-cve-2026-39834ubuntu-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-lts
Published: 05/22/2026 (05/22/2026, 04:16:00 UTC)
Source: GCVE Database
Product: golang-go.crypto
Description
When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation.
CVSS v3.1
Score 9.1critical
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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-2026-39834
- 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: 6a5fd0851010f89cc2192cd9
Added to database: 07/21/2026, 20:03:17 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 19
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