CVEvulnerability
CVE-2026-56741
7.5 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-07-17
- Last modified
- 2026-10-24
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-400
Description
JLine is a Java library for handling console input. Prior to 3.30.14, 4.0.16, and 4.2.1, the JLine3 Telnet server remote-telnet module does not apply an upper bound to terminal dimensions received via the Telnet NAWS option, and TelnetIO.handleNAWS() in TelnetIO.java:856-879 reads client-supplied width and height as 16-bit unsigned integers and passes values such as 65535x65535 to setTerminalGeometry(), allowing an unauthenticated remote attacker to repeatedly alternate values and trigger continuous expensive rendering work that causes CPU exhaustion and denial of service. This issue is fixed in versions 3.30.14, 4.0.16, and 4.2.1.
Affected configurations
• jline jline (< 3.30.14)
• jline jline (>= 4.0.0 < 4.0.16)
• jline jline (>= 4.1.0 < 4.2.1)
Related
Weakness · CWE (1)
- CWE-400 Uncontrolled Resource Consumption weakness
References
- https://github.com/jline/jline3/commit/3ea9cad8699714dc072fade29d36be0d1e23d708 Patch
- https://github.com/jline/jline3/commit/733eb353dca7b0ea0252e724445b6defa29c393e Patch
- https://github.com/jline/jline3/commit/86b7ba7801988aadb1a67555629522a71d603bd3 Patch
- https://github.com/jline/jline3/pull/2000 Issue Tracking
- https://github.com/jline/jline3/releases/tag/4.0.16 Release Notes
- https://github.com/jline/jline3/releases/tag/4.2.1 Release Notes
- https://github.com/jline/jline3/security/advisories/GHSA-2r2c-cx56-8933 Vendor Advisory, Exploit
- https://github.com/jline/jline3/security/advisories/GHSA-2r2c-cx56-8933 Vendor Advisory, Exploit