VYPR
High severity7.5NVD Advisory· Published Jul 17, 2026· Updated Aug 18, 2026

CVE-2026-56740

CVE-2026-56740

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 limit the number of environment variables a client may inject via the Telnet NEW-ENVIRON option, and TelnetIO.readNEVariables() in TelnetIO.java:1127-1180 stores each variable pair in a HashMap held by ConnectionData, allowing an unauthenticated attacker to flood unique variable pairs before the terminating IAC SE byte and exhaust JVM heap memory with an OutOfMemoryError. This issue is fixed in versions 3.30.14, 4.0.16, and 4.2.1.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
org.jline:jline-remote-telnetMaven
< 4.2.14.2.1

Affected products

44

Patches

Vulnerability mechanics

References

11

News mentions

0

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