CVE-2026-0968: Libssh: libssh: denial of service due to malformed sftp message

Severity: low (CVSS 3.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-26 · updated 2026-09-01
Weakness: CWE-476

Description

A flaw was found in libssh in which a malicious SFTP (SSH File Transfer Protocol) server can exploit this by sending a malformed 'longname' field within an `SSH_FXP_NAME` message during a file listing operation. This missing null check can lead to reading beyond allocated memory on the heap. This can cause unexpected behavior or lead to a denial of service (DoS) due to application crashes.

Affected products

libssh: through 0.11.3
Red Hat Enterprise Linux: 9.0, 10.0

References

https://access.redhat.com/errata/RHSA-2026:18160
https://access.redhat.com/errata/RHSA-2026:18683
https://access.redhat.com/security/cve/CVE-2026-0968
https://bugzilla.redhat.com/show_bug.cgi?id=2436982
https://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/

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