CVE & CISA-KEV Catalog

CVE-2026-59847

MEDIUM
5.9
CVSS v3
NVD

Description

A flaw was found in libssh. Incorrect AES-GCM finalization checks in builds using the OpenSSL backend can effectively remove integrity protection, allowing an in-path attacker to modify plaintext on the wire without detection.

How to fix

Remediation Available
libsshDebian
Fixed in:0.11.5-0+deb13u1CVE-2026-59847
Fixed in:0.12.1-1CVE-2026-59847
libsshRocky
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
libsshRed Hat / RHEL
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:main@aarch64RHSA-2026:42922
Fixed in:main@srcRHSA-2026:42922
libssh-configRed Hat / RHEL
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.10.4-19.el9_8RHSA-2026:62217
libssh-configRocky
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.10.4-19.el9_8RHSA-2026:62217
libssh-debuginfoRocky
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
libssh-debuginfoRed Hat / RHEL
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
libssh-debugsourceRocky
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
libssh-debugsourceRed Hat / RHEL
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
libssh-develRocky
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
libssh-develRed Hat / RHEL
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.12.0-3.el10_2RHSA-2026:55855
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
Fixed in:0:0.9.6-17.el8_10RHSA-2026:62218
libsshUbuntu
Fixed in:0.9.6-2ubuntu0.22.04.8USN-8699-1
Fixed in:0.10.6-2ubuntu0.5USN-8699-1
libssh-4Ubuntu
Fixed in:0.9.6-2ubuntu0.22.04.8USN-8699-1
Fixed in:0.10.6-2ubuntu0.5USN-8699-1

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityHigh
AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U

Exploit Intelligence

0.33%probability of exploitation in 30 days
26thpercentile

Low risk: more likely to be exploited than 26% of all known CVEs.

References

Related Vulnerabilities

Other CWE-253 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2023-49286High8.610%-Fix
CVE-2017-7474Critical9.82.5%--
CVE-2024-43521High7.52.4%-Fix
CVE-2020-6107Medium5.51.5%-Fix
CVE-2022-24880Medium5.31.2%-Fix
CVE-2023-24487Medium6.31.1%-Fix

Common questions

How do I fix CVE-2026-59847?

Published advisories record a fix for 13 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-59847 being actively exploited?

Not that we know of. CVE-2026-59847 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.33% is the estimated probability that it will be exploited in the next 30 days. That is higher than 26% of all scored CVEs.

How severe is CVE-2026-59847?

CVE-2026-59847 has a CVSS v3 base score of 5.9, rated moderate. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-59847 affect?

Published advisories record a fix for libssh (Debian), libssh (Rocky), libssh (Red Hat / RHEL), libssh-config (Red Hat / RHEL), and 9 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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CVE-2026-59847 severity badge

Markdown

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-04.