Resource exhaustion in Libssh

CVE-2026-59848

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.

EPSS: 0.003 (26.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-59848?
CVE-2026-59848 is a medium-severity vulnerability in Libssh, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.3/10. Published 2026-07-21.
How severe is CVE-2026-59848?
Medium severity. CVSS v3 base score is 5.3 out of 10.