CVE-2026-56741JLine is a Java library for handling console input.
Updated under an hour ago ()
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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.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-400
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Aug 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
jline jline jline:jline | before 3.30.14; from 4.0.0 before 4.0.16; from 4.1.0 before 4.2.1 | NVD |
References
- https://github.com/jline/jline3/commit/3ea9cad8699714dc072fade29d36be0d1e23d708patch
- https://github.com/jline/jline3/commit/733eb353dca7b0ea0252e724445b6defa29c393epatch
- https://github.com/jline/jline3/commit/86b7ba7801988aadb1a67555629522a71d603bd3patch
- https://github.com/jline/jline3/pull/2000issue-tracking
- https://github.com/jline/jline3/releases/tag/4.0.16release-notes
- https://github.com/jline/jline3/releases/tag/4.2.1release-notes
- https://github.com/jline/jline3/security/advisories/GHSA-2r2c-cx56-8933vendor-advisory, exploit
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.