6.5Medium

CVE-2026-59844Libssh: libssh: denial of service via oversized sftp read length

Red Hat Red Hat Enterprise Linux 10; Red Hat Red Hat Enterprise Linux 8; Red Hat Red Hat Enterprise Linux 9; Red Hat Red Hat Hardened Images Published: 2026-07-21 14:32 (3 months ago)

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.

Weakness (CWE): CWE-789

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

Vendor	Product	Versions
enterprise linux	8	—
enterprise linux	9	—
libssh	libssh	—
redhat	enterprise linux	8.0
redhat	hardened images	—
Red Hat	Red Hat Enterprise Linux 10	all versions
Red Hat	Red Hat Enterprise Linux 8	all versions
Red Hat	Red Hat Enterprise Linux 9	all versions
Red Hat	Red Hat Hardened Images	all versions

References and patches

RHSA-2026:42922 vendor-advisoryVendor Advisory
RHSA-2026:55855 vendor-advisory
RHSA-2026:62217 vendor-advisory
RHSA-2026:62218 vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-59844 vdb-entryVendor Advisory
RHBZ#2498177 issue-trackingIssue TrackingVendor Advisory

CPE matches (NVD) (5)

cpe:2.3:a:libssh:libssh:-:*:*:*:*:*:*:*
cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*

CVSS score

6.5Medium

Source: redhat · CVSS 3.1

Attack vector: Network
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

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

All scores (2)

cna	CVSS 3.1	6.5Medium
secalert@redhat.com	CVSS 3.1	6.5Medium

EPSS (chance of exploitation in 30 days)

0.57%

higher than 48% of all CVEs

CISA assessment (SSVC)

Exploitation: none
Automatable: no
Technical impact: partial

Timeline

ID reserved2026-07-07
Published2026-07-21 14:32
Reached IP-DB2026-10-24 23:45
Last updated2026-09-02 00:18

Assigned by (CNA): redhat
NVD status: Modified

View at source: CVE.org · NVD

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