p PatchFirst

CVE-2026-39830

CVE-2026-39830 · Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh

This page contains facts from public vulnerability sources. Check the original advisory before updating.

This page shows selected source facts. See the linked advisories for the complete description and affected versions.

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 9.1 · Critical · EPSS 0.7% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • golang.org/x/crypto/ssh

    Versions
    • ≥ 0, < 0.52.0: Affected (semver)

    Update to 0.52.0

  • golang-go.crypto Debian:12

    Versions
    • 1:0.10.0-1
    • 1:0.12.0-1
    • 1:0.13.0-1
    • 1:0.14.0-1
    • 1:0.16.0-1
    • 1:0.17.0-1
    • 1:0.18.0-1
    • 1:0.19.0-1
    • 1:0.21.0-1
    • 1:0.22.0-1
    • 1:0.23.0-1
    • 1:0.24.0-1
    • 1:0.24.0-2
    • 1:0.25.0-1
    • 1:0.25.0-1~bpo12+1
    • 1:0.33.0-1~exp1
    • 1:0.36.0-1~exp1
    • 1:0.4.0-1
    • 1:0.41.0-1~exp1
    • 1:0.42.0-1
    • 1:0.42.0-1~exp1
    • 1:0.42.0-2
    • 1:0.42.0-3
    • 1:0.42.0-4
    • 1:0.43.0-1
    • 1:0.43.0-2
    • 1:0.45.0-1
    • 1:0.46.0-1
    • 1:0.47.0-1
    • 1:0.50.0-1
    • 1:0.52.0-1
    • 1:0.52.0-1~bpo13+1
    • 1:0.53.0-1
    • 1:0.54.0-1
    • 1:0.55.0-1
    • 1:0.56.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-go.crypto Debian:13

    Versions
    • 1:0.25.0-1
    • 1:0.33.0-1~exp1
    • 1:0.36.0-1~exp1
    • 1:0.41.0-1~exp1
    • 1:0.42.0-1
    • 1:0.42.0-1~exp1
    • 1:0.42.0-2
    • 1:0.42.0-3
    • 1:0.42.0-4
    • 1:0.43.0-1
    • 1:0.43.0-2
    • 1:0.45.0-1
    • 1:0.46.0-1
    • 1:0.47.0-1
    • 1:0.50.0-1
    • 1:0.52.0-1
    • 1:0.52.0-1~bpo13+1
    • 1:0.53.0-1
    • 1:0.54.0-1
    • 1:0.55.0-1
    • 1:0.56.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-go.crypto Debian:14

    Versions
    • 1:0.25.0-1
    • 1:0.33.0-1~exp1
    • 1:0.36.0-1~exp1
    • 1:0.41.0-1~exp1
    • 1:0.42.0-1
    • 1:0.42.0-1~exp1
    • 1:0.42.0-2
    • 1:0.42.0-3
    • 1:0.42.0-4
    • 1:0.43.0-1
    • 1:0.43.0-2
    • 1:0.45.0-1
    • 1:0.46.0-1
    • 1:0.47.0-1
    • 1:0.50.0-1
    • 1:0.52.0-1~bpo13+1
    Affected ranges
    • ECOSYSTEM: < 1:0.52.0-1

    Update to 1:0.52.0-1

  • golang-go.crypto Ubuntu:Pro:16.04:LTS

    Versions
    • 1:0.0~git20150608-1
    • 1:0.0~git20151201.0.7b85b09-2
    • 1:0.0~git20151201.0.7b85b09-2ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: < 1:0.0~git20151201.0.7b85b09-2ubuntu0.1~esm2

    Update to 1:0.0~git20151201.0.7b85b09-2ubuntu0.1~esm2

  • lxd Ubuntu:Pro:16.04:LTS

    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
    Affected ranges
    • ECOSYSTEM: < 2.0.11-0ubuntu1~16.04.4+esm3

    Update to 2.0.11-0ubuntu1~16.04.4+esm3

  • snapd Ubuntu:Pro:16.04:LTS

    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
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • google-guest-agent Ubuntu:Pro:16.04:LTS

    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
    Affected ranges
    • ECOSYSTEM: < 20240716.00-0ubuntu1~16.04.0+esm3

    Update to 20240716.00-0ubuntu1~16.04.0+esm3

  • lxd Ubuntu:Pro:18.04:LTS

    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
    Affected ranges
    • ECOSYSTEM: < 3.0.3-0ubuntu1~18.04.2+esm3

    Update to 3.0.3-0ubuntu1~18.04.2+esm3

  • snapd Ubuntu:Pro:18.04:LTS

    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
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-go.crypto Ubuntu:Pro:18.04:LTS

    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
    Affected ranges
    • ECOSYSTEM: < 1:0.0~git20170629.0.5ef0053-2ubuntu0.1~esm2

    Update to 1:0.0~git20170629.0.5ef0053-2ubuntu0.1~esm2

  • google-guest-agent Ubuntu:Pro:18.04:LTS

    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
    Affected ranges
    • ECOSYSTEM: < 20241011.01-0ubuntu1~18.04.0+esm3

    Update to 20241011.01-0ubuntu1~18.04.0+esm3

  • google-guest-agent Ubuntu:Pro:20.04:LTS

    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
    Affected ranges
    • ECOSYSTEM: < 20250116.00-0ubuntu1~20.04.0+esm3

    Update to 20250116.00-0ubuntu1~20.04.0+esm3

  • snapd Ubuntu:Pro:20.04:LTS

    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
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-go.crypto Ubuntu:Pro:20.04:LTS

    Versions
    • 1:0.0~git20190701.4def268-2
    • 1:0.0~git20200221.2aa609c-1
    • 1:0.0~git20200221.2aa609c-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: < 1:0.0~git20200221.2aa609c-1ubuntu0.1~esm2

    Update to 1:0.0~git20200221.2aa609c-1ubuntu0.1~esm2

  • google-guest-agent Ubuntu:22.04:LTS

    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
    Affected ranges
    • ECOSYSTEM: < 20250116.00-0ubuntu1~22.04.3

    Update to 20250116.00-0ubuntu1~22.04.3

  • snapd Ubuntu:22.04:LTS

    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
    • 2.76.3+ubuntu22.04
    • 2.76.3+ubuntu22.04.1
    • 2.77.1+ubuntu22.04.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-go.crypto Ubuntu:Pro:22.04:LTS

    Versions
    • 1:0.0~git20201221.eec23a3-1
    • 1:0.0~git20211202.5770296-1
    • 1:0.0~git20211202.5770296-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: < 1:0.0~git20211202.5770296-1ubuntu0.1~esm2

    Update to 1:0.0~git20211202.5770296-1ubuntu0.1~esm2

  • google-guest-agent Ubuntu:24.04:LTS

    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
    Affected ranges
    • ECOSYSTEM: < 20250116.00-0ubuntu1~24.04.4

    Update to 20250116.00-0ubuntu1~24.04.4

  • snapd Ubuntu:24.04:LTS

    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
    • 2.76.3+ubuntu24.04
    • 2.77.1+ubuntu24.04
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-go.crypto Ubuntu:Pro:24.04:LTS

    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
    Affected ranges
    • ECOSYSTEM: < 1:0.19.0-1ubuntu0.1~esm2

    Update to 1:0.19.0-1ubuntu0.1~esm2

  • golang-go.crypto Ubuntu:25.10

    Versions
    • 1:0.25.0-1
    • 1:0.25.0-1ubuntu0.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • google-guest-agent Ubuntu:25.10

    Versions
    • 20250116.00-0ubuntu2
    • 20250506.01-0ubuntu1
    • 20250506.01-0ubuntu1.1
    Affected ranges
    • ECOSYSTEM: < 20250506.01-0ubuntu1.2

    Update to 20250506.01-0ubuntu1.2

  • snapd Ubuntu:25.10

    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
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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