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CVE-2026-39829: CWE-1176: Inefficient CPU Computation in golang.org/x/crypto golang.org/x/crypto/ssh
Severity: highType: vulnerabilityCVE-2026-39829
The RSA and DSA public key parsers did not enforce size limits on key parameters. A crafted public key with an excessively large modulus or DSA parameter could cause several minutes of CPU consumption during signature verification. This could be triggered by unauthenticated clients during public key authentication. RSA moduli are now limited to 8192 bits, and DSA parameters are validated per FIPS 186-2.
EPSS 0.5%top 62%
CVE-2026-39829: CWE-1176: Inefficient CPU Computation in golang.org/x/crypto golang.org/x/crypto/ssh
0
HighVulnerabilityCVE-2026-39829gcveosvubuntu-cve-2026-39829ubuntu-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-2026-39829cwe-1176cwe-1284
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
The RSA and DSA public key parsers did not enforce size limits on key parameters. A crafted public key with an excessively large modulus or DSA parameter could cause several minutes of CPU consumption during signature verification. This could be triggered by unauthenticated clients during public key authentication. RSA moduli are now limited to 8192 bits, and DSA parameters are validated per FIPS 186-2.
CVSS v3.1
Score 7.5high
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected software
golang-go.crypto
pkg:deb/ubuntu/golang-go.crypto@1:0.0~git20151201.0.7b85b09-2ubuntu0.1~esm3?arch=source&distro=esm-infra-legacy/xenialAffected versions
=1:0.0~git20150608-1=1:0.0~git20151201.0.7b85b09-2=1:0.0~git20151201.0.7b85b09-2ubuntu0.1~esm1=1:0.0~git20151201.0.7b85b09-2ubuntu0.1~esm2=1:0.0~git20151201.0.7b85b09-2ubuntu0.1~esm3
lxd
pkg:deb/ubuntu/[email protected]~16.04.4+esm3?arch=source&distro=esm-infra-legacy/xenialAffected 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
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
=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=20240716.00-0ubuntu1~16.04.0+esm3
lxd
pkg:deb/ubuntu/[email protected]~18.04.2+esm3?arch=source&distro=esm-infra/bionicAffected 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
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~esm3?arch=source&distro=esm-apps/bionicAffected versions
=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=1:0.0~git20170629.0.5ef0053-2ubuntu0.1~esm2=1:0.0~git20170629.0.5ef0053-2ubuntu0.1~esm3
google-guest-agent
pkg:deb/ubuntu/[email protected]~18.04.0+esm3?arch=source&distro=esm-apps/bionicAffected versions
=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=20241011.01-0ubuntu1~18.04.0+esm3
google-guest-agent
pkg:deb/ubuntu/[email protected]~20.04.0+esm3?arch=source&distro=esm-infra/focalAffected versions
=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=20250116.00-0ubuntu1~20.04.0+esm3
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~esm3?arch=source&distro=esm-apps/focalAffected versions
=1:0.0~git20190701.4def268-2=1:0.0~git20200221.2aa609c-1=1:0.0~git20200221.2aa609c-1ubuntu0.1~esm1=1:0.0~git20200221.2aa609c-1ubuntu0.1~esm2=1:0.0~git20200221.2aa609c-1ubuntu0.1~esm3
google-guest-agent
pkg:deb/ubuntu/[email protected]~22.04.3?arch=source&distro=jammyAffected versions
=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=20250116.00-0ubuntu1~22.04.3
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~esm3?arch=source&distro=esm-apps/jammyAffected versions
=1:0.0~git20201221.eec23a3-1=1:0.0~git20211202.5770296-1=1:0.0~git20211202.5770296-1ubuntu0.1~esm1=1:0.0~git20211202.5770296-1ubuntu0.1~esm2=1:0.0~git20211202.5770296-1ubuntu0.1~esm3
google-guest-agent
pkg:deb/ubuntu/[email protected]~24.04.4?arch=source&distro=nobleAffected versions
=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=20250116.00-0ubuntu1~24.04.4
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~esm3?arch=source&distro=esm-apps/nobleAffected versions
=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=1:0.19.0-1ubuntu0.1~esm2=1:0.19.0-1ubuntu0.1~esm3
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
=20250116.00-0ubuntu2=20250506.01-0ubuntu1=20250506.01-0ubuntu1.1=20250506.01-0ubuntu1.2
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
=20250506.01-0ubuntu1=20250506.01-0ubuntu2=20250506.01-0ubuntu2.1
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
=1:0.25.0-1=1:0.45.0-1=1:0.47.0-1=1:0.47.0-1ubuntu0.1~esm1
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-2026-39829
- 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: 6a5fd0891010f89cc2198467
Added to database: 07/21/2026, 20:03:21 UTC
Last updated: 07/31/2026, 22:27:47 UTC
Views: 27
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