CVE-2026-59848

MEDIUM 5.3

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

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	red hat
Product	red hat enterprise linux 10
Published	Jul 21, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Affected Versions

Red Hat / Red Hat Enterprise Linux 10

All versions affected

Red Hat / Red Hat Enterprise Linux 8

All versions affected

Red Hat / Red Hat Enterprise Linux 9

All versions affected

Red Hat / Red Hat Hardened Images

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-59848 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2498181

Credits

Red Hat would like to thank Aisle Research for reporting this issue.