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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-56741 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/jline/jline3/commit/3ea9cad8699714dc072fade29d36be0d1e23d708 GitHub, Inc.
https://github.com/jline/jline3/commit/733eb353dca7b0ea0252e724445b6defa29c393e GitHub, Inc.
https://github.com/jline/jline3/commit/86b7ba7801988aadb1a67555629522a71d603bd3 GitHub, Inc.
https://github.com/jline/jline3/pull/2000 GitHub, Inc.
https://github.com/jline/jline3/releases/tag/4.0.16 GitHub, Inc.
https://github.com/jline/jline3/releases/tag/4.2.1 GitHub, Inc.
https://github.com/jline/jline3/security/advisories/GHSA-2r2c-cx56-8933 GitHub, Inc.

Weakness Enumeration

CWE-ID CWE Name Source
CWE-400 Uncontrolled Resource Consumption GitHub, Inc.  

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-56741
NVD Published Date:
07/17/2026
NVD Last Modified:
07/17/2026
Source:
GitHub, Inc.