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CVE-2026-59848

Libssh: libssh: denial of service via sftp responses with unknown request ids

MEDIUM
5.3
CVSS Score
Published: July 21, 2026 at 01:21 PM UTC
Updated: September 1, 2026 at 09:18 PM UTC
3 products affected across 2 vendorsEnterprise LinuxHardened ImagesLibssh

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

A flaw was found in libssh. A malicious SFTP server can send responses for unknown request IDs that libssh clients keep queued indefinitely, causing unbounded memory growth and client-side denial of service.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Libssh· Libssh
95%
All versions
Enterprise Linux· Red Hatrpm
95%
10.08.09.0
Vendor states this is fixed in 0:0.10.4-19.el9_8 (unaffected)
Vendor states this is fixed in 0:0.12.0-3.el10_2 (unaffected)
Vendor states this is fixed in 0:0.9.6-17.el8_10 (unaffected)
Hardened Images· Red Hatcontainer
95%
1
Vendor states this is fixed in 0.12.1-4.hum1 (unaffected)

References (6)

VDB Entryx_refsource_REDHATVendor Advisory
Source: cverecord
https://access.redhat.com/security/cve/CVE-2026-59848
Issue Trackingx_refsource_REDHATVendor Advisory
Source: cverecord
https://bugzilla.redhat.com/show_bug.cgi?id=2498181
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:42922
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:55855
Vendor Advisoryx_refsource_REDHAT
Source: [email protected]
https://access.redhat.com/errata/RHSA-2026:62218
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:62217

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMredhat
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-770

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