Resource exhaustion in jline3 - #VU148447
Published: September 9, 2026
Vulnerability identifier: #VU148447
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the JLine3 remote-ssh shell channel handler when processing SSH window-change requests with unbounded terminal dimensions. A remote user can send alternating window-change requests with oversized terminal dimensions to cause a denial of service.
Exploitation requires valid SSH credentials and can consume session threads through CPU exhaustion.
Affected software
jline3
Remediation
Install security update from vendor's website.
jline3 - update to 4.4.3