CVE-2026-59844

MEDIUM

Libssh: libssh: denial of service via oversized sftp read length

Title source: cna
STIX 2.1

Description

A flaw was found in libssh. A remote authenticated client can issue SSH_FXP_READ requests with an arbitrarily large length, causing a libssh SFTP server to allocate excessive memory and potentially exhaust it through repeated requests.

References (3)

Core 3
Core References
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:42922
https://access.redhat.com/errata/RHSA-2026:42922
Vdb Entry, X_Refsource_Redhat vdb-entry x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2026-59844
Issue Tracking, X_Refsource_Redhat issue-tracking x_refsource_redhat
RHBZ#2498177
https://bugzilla.redhat.com/show_bug.cgi?id=2498177

Scores

CVSS v3 6.5
EPSS 0.0052
EPSS Percentile 41.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-789
Status published
Products (11)
libssh/libssh
Red Hat/Red Hat Enterprise Linux 10
Red Hat/Red Hat Enterprise Linux 7
Red Hat/Red Hat Enterprise Linux 8
Red Hat/Red Hat Enterprise Linux 9
Red Hat/Red Hat Hardened Images
Red Hat/Red Hat Hardened Images 0.12.1-4.hum1
redhat/enterprise_linux 8.0
redhat/enterprise_linux 9.0
redhat/enterprise_linux 10.0
... and 1 more
Published Jul 21, 2026
Tracked Since Jul 21, 2026