Resource exhaustion in libssh - CVE-2026-59848
Published: July 27, 2026
Vulnerability identifier: #VU139531
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-59848
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: libssh
Affected software:
libssh
libssh
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper handling of unexpected responses in the sftp client response queue when processing server-supplied sftp response packets. A remote attacker can send response packets with unknown request IDs to cause a denial of service.
The issue affects the client side only.
How to mitigate CVE-2026-59848
Install security update from vendor's website.