ALSA-2026:55855: Security update for 3 packages

ALSA-2026:55855, released August 17, 2026, fixes 11 CVEs across 3 products. None of them is reported as exploited. Patch Radar priority: High.

High

CVEs closed

None rated Critical

Exploited

None reported

Highest CVSS

8.8

Base score, 0 to 10

Highest EPSS

0.0057

47th percentile

Priority of the 11 CVEs

Patch now 0
                                Urgent 0
                                High 11
                                Routine 0

Fixed package versions

Product	Release	Fixed in
libssh	almalinux 10	0.12.0-3.el10_2
libssh-config	almalinux 10	0.12.0-3.el10_2
libssh-devel	almalinux 10	0.12.0-3.el10_2

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
High	CVE-2026-59843	Libssh: libssh: denial of service via zero advertised channel packet size	8.8	0.0057	None reported
High	CVE-2026-59844	Libssh: libssh: denial of service via oversized sftp read length	8.8	0.0057	None reported
High	CVE-2026-59842	libssh: A flaw was found in libssh	8.8	0.0049	None reported
High	CVE-2026-59851	libssh: A flaw was found in libssh	8.8	0.0049	None reported
High	CVE-2026-59849	libssh: A flaw was found in libssh	8.8	0.0044	None reported
High	CVE-2026-59850	Libssh: libssh: use-after-free via data callbacks on closed channels	8.8	0.0035	None reported
High	CVE-2026-59848	Libssh: libssh: denial of service via sftp responses with unknown request ids	8.8	0.0034	None reported
High	CVE-2026-59847	Libssh: libssh: integrity downgrade via openssl aes-gcm tag verification	8.8	0.0033	None reported
High	CVE-2026-15370	libssh: A flaw was found in libssh	8.8	0.0017	None reported
High	CVE-2026-59846	libssh: A flaw was found in libssh	8.8	0.0012	None reported
High	CVE-2026-59845	Libssh: libssh: denial of service via unchecked proxycommand fork() failure	8.8	0.0010	None reported

Also fixes CVE-2026-59844

RHSA-2026:55855
libssh on RHEL 10
RLSA-2026:55855
libssh on rocky 10
ELSA-2026-55855
libssh, libssh-config, libssh-devel on ol 10
OPENSUSE-SU-2026:21444-1
libssh on opensuse-leap 16.0
SUSE-SU-2026:22956-1
libssh on sles 16.0
FEDORA-2026-063CAA9112
libssh, libssh-config, libssh-debuginfo and 2 more on Fedora 43
libssh-4 0.11.3-1ubuntu2.1
libssh-4 on Ubuntu 26.04.1 LTS (resolute)
RHSA-2026:62217
libssh, libssh-config, libssh-devel on RHEL 9

Vendor advisory

https://osv.dev/vulnerability/ALSA-2026:55855

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