CVE-2026-56740 JLine: Unauthenticated Remote Memory Exhaustion via Unbounded Telnet NEW-ENVIRON Variables

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 limit the number of environment variables a client may inject via the Telnet NEW-ENVIRON option, and TelnetIO.readNEVariables in TelnetIO.java:1127-1180...

CVE-2026-56740

JLine3 Telnet server remote-telnet module in JLine prior to versions 3.30.14, 4.0.16, and 4.2.1 does not limit the number of environment variables injected via Telnet NEW-ENVIRON. TelnetIO.readNEVariables() stores each variable pair in a HashMap within ConnectionData (lines 1127-1180), allowing a...