CVE-2026-59845
Libssh: libssh: denial of service via unchecked proxycommand fork() failure
CVE-2026-59845 is fixed in 7 products on 1 platform, first by libssh-4 0.9.6-2ubuntu0.22.04.8, released July 21, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
8.8
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0010
1st percentile
A flaw was found in libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libssh · Debian 12.15 (bookworm) | 0.10.6-0+deb12u3 | DEBIAN-CVE-2026-59845 | Jul 31, 2026 |
| libssh · Debian 13.5 (trixie) | 0.11.5-0+deb13u1 | DEBIAN-CVE-2026-59845 | Jul 31, 2026 |
| libssh · Debian 14 | 0.12.1-1 | DEBIAN-CVE-2026-59845 | Jul 31, 2026 |
| libssh · Fedora 43 | 0.11.5-1.fc43 | FEDORA-2026-063CAA9112 | Jul 21, 2026 |
| libssh · RHEL 10 | 0.12.0-3.el10_2 | RHSA-2026:55855 | Aug 18, 2026 |
| libssh · RHEL 8 | 0:0.9.6-17.el8_10 | RHSA-2026:62218 | Sep 13, 2026 |
| libssh · RHEL 9 | 0:0.10.4-19.el9_8 | RHSA-2026:62217 | Sep 13, 2026 |
| libssh · almalinux 10 | 0.12.0-3.el10_2 | ALSA-2026:55855 | Aug 17, 2026 |
| libssh · almalinux 8 | 0.9.6-17.el8_10 | ALSA-2026:62218 | Sep 1, 2026 |
| libssh · almalinux 9 | 0.10.4-19.el9_8 | ALSA-2026:62217 | Sep 1, 2026 |
| libssh · amzn 2023 | 0.10.6-1.amzn2023.0.9 | ALAS2023-2026-3096 | Sep 28, 2026 |
| libssh · ol 10 | 0:0.12.0-3.el10_2 | ELSA-2026-55855 | Aug 17, 2026 |
| libssh · ol 8 | 0:0.9.6-17.el8_10 | ELSA-2026-62218-0 | Sep 1, 2026 |
| libssh · ol 9 | 0:0.10.4-19.el9_8 | ELSA-2026-62217-0 | Sep 1, 2026 |
| libssh · opensuse-leap 16.0 | 0.11.5-160000.1.1 | OPENSUSE-SU-2026:21444-1 | Jul 25, 2026 |
| libssh · rocky 10 | 0:0.12.0-3.el10_2 | RLSA-2026:55855 | Aug 18, 2026 |
| libssh · rocky 8 | 0:0.9.6-17.el8_10 | RLSA-2026:62218 | Sep 2, 2026 |
| libssh · rocky 9 | 0:0.10.4-19.el9_8 | RLSA-2026:62217 | Sep 2, 2026 |
| libssh · sles 15.6 | 0.9.8-150600.11.15.1 | SUSE-SU-2026:3330-1 | Jul 28, 2026 |
| libssh · sles 15.7 | 0.9.8-150600.11.15.1 | SUSE-SU-2026:3330-1 | Jul 28, 2026 |
| libssh · sles 16.0 | 0.11.5-160000.1.1 | SUSE-SU-2026:22956-1 | Jul 25, 2026 |
| libssh-4 · Ubuntu 22.04.1 LTS (jammy) | 0.9.6-2ubuntu0.22.04.8 | libssh-4 0.9.6-2ubuntu0.22.04.8 | Jul 21, 2026 |
| libssh-4 · Ubuntu 24.04.5 LTS (noble) | 0.10.6-2ubuntu0.5 | libssh-4 0.10.6-2ubuntu0.5 | Jul 21, 2026 |
| libssh-4 · Ubuntu 26.04.1 LTS (resolute) | 0.11.3-1ubuntu2.1 | libssh-4 0.11.3-1ubuntu2.1 | Jul 21, 2026 |
| libssh-config · Fedora 43 | 0.11.5-1.fc43 | FEDORA-2026-063CAA9112 | Jul 21, 2026 |
| libssh-config · RHEL 8 | 0:0.9.6-17.el8_10 | RHSA-2026:62218 | Sep 13, 2026 |
| libssh-config · RHEL 9 | 0:0.10.4-19.el9_8 | RHSA-2026:62217 | Sep 13, 2026 |
| libssh-config · almalinux 10 | 0.12.0-3.el10_2 | ALSA-2026:55855 | Aug 17, 2026 |
| libssh-config · almalinux 8 | 0.9.6-17.el8_10 | ALSA-2026:62218 | Sep 1, 2026 |
| libssh-config · almalinux 9 | 0.10.4-19.el9_8 | ALSA-2026:62217 | Sep 1, 2026 |
| libssh-config · amzn 2023 | 0.10.6-1.amzn2023.0.9 | ALAS2023-2026-3096 | Sep 28, 2026 |
| libssh-config · ol 10 | 0:0.12.0-3.el10_2 | ELSA-2026-55855 | Aug 17, 2026 |
| libssh-config · ol 8 | 0:0.9.6-17.el8_10 | ELSA-2026-62218-0 | Sep 1, 2026 |
| libssh-config · ol 9 | 0:0.10.4-19.el9_8 | ELSA-2026-62217-0 | Sep 1, 2026 |
| libssh-debuginfo · Fedora 43 | 0.11.5-1.fc43 | FEDORA-2026-063CAA9112 | Jul 21, 2026 |
| libssh-debuginfo · amzn 2023 | 0.10.6-1.amzn2023.0.9 | ALAS2023-2026-3096 | Sep 28, 2026 |
| libssh-debugsource · Fedora 43 | 0.11.5-1.fc43 | FEDORA-2026-063CAA9112 | Jul 21, 2026 |
| libssh-debugsource · amzn 2023 | 0.10.6-1.amzn2023.0.9 | ALAS2023-2026-3096 | Sep 28, 2026 |
| libssh-devel · Fedora 43 | 0.11.5-1.fc43 | FEDORA-2026-063CAA9112 | Jul 21, 2026 |
| libssh-devel · RHEL 8 | 0:0.9.6-17.el8_10 | RHSA-2026:62218 | Sep 13, 2026 |
| libssh-devel · RHEL 9 | 0:0.10.4-19.el9_8 | RHSA-2026:62217 | Sep 13, 2026 |
| libssh-devel · almalinux 10 | 0.12.0-3.el10_2 | ALSA-2026:55855 | Aug 17, 2026 |
| libssh-devel · almalinux 8 | 0.9.6-17.el8_10 | ALSA-2026:62218 | Sep 1, 2026 |
| libssh-devel · almalinux 9 | 0.10.4-19.el9_8 | ALSA-2026:62217 | Sep 1, 2026 |
| libssh-devel · amzn 2023 | 0.10.6-1.amzn2023.0.9 | ALAS2023-2026-3096 | Sep 28, 2026 |
| libssh-devel · ol 10 | 0:0.12.0-3.el10_2 | ELSA-2026-55855 | Aug 17, 2026 |
| libssh-devel · ol 8 | 0:0.9.6-17.el8_10 | ELSA-2026-62218-0 | Sep 1, 2026 |
| libssh-devel · ol 9 | 0:0.10.4-19.el9_8 | ELSA-2026-62217-0 | Sep 1, 2026 |
| libssh-gcrypt-4 · Ubuntu 22.04.1 LTS (jammy) | 0.9.6-2ubuntu0.22.04.8 | libssh-gcrypt-4 0.9.6-2ubuntu0.22.04.8 | Jul 21, 2026 |
| libssh-gcrypt-4 · Ubuntu 24.04.5 LTS (noble) | 0.10.6-2ubuntu0.5 | libssh-gcrypt-4 0.10.6-2ubuntu0.5 | Jul 21, 2026 |
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