CVEvulnerability
CVE-2026-56740
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 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.
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/0389f0ee6d0375901b602671ad5dafd4d1d4ee09 Patch
- https://github.com/jline/jline3/commit/4ee3a73849ffb9a85ec748e4e8cd8f6d81f84f40 Patch
- https://github.com/jline/jline3/commit/934f09e6128cee33c2b13d42b6e859c1ee2d194b Patch
- https://github.com/jline/jline3/pull/2000 Issue Tracking
- https://github.com/jline/jline3/pull/2001 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/releases/tag/jline-3.30.14 Release Notes
- https://github.com/jline/jline3/security/advisories/GHSA-47qp-hqvx-6r3f Exploit, Vendor Advisory
- https://github.com/jline/jline3/security/advisories/GHSA-47qp-hqvx-6r3f Exploit, Vendor Advisory