Vulnerability Details CVE-2026-56741
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.006
EPSS Ranking 47.1%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2026-56741
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cpe:2.3:a:jline:jline:1.0
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cpe:2.3:a:jline:jline:2.0
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cpe:2.3:a:jline:jline:2.1
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cpe:2.3:a:jline:jline:2.10
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cpe:2.3:a:jline:jline:2.11
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cpe:2.3:a:jline:jline:2.12
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cpe:2.3:a:jline:jline:2.12.1
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cpe:2.3:a:jline:jline:2.13
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cpe:2.3:a:jline:jline:2.14
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cpe:2.3:a:jline:jline:2.14.1
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cpe:2.3:a:jline:jline:2.14.2
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cpe:2.3:a:jline:jline:2.14.3
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cpe:2.3:a:jline:jline:2.14.4
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cpe:2.3:a:jline:jline:2.14.5
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cpe:2.3:a:jline:jline:2.14.6
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cpe:2.3:a:jline:jline:2.2.1
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cpe:2.3:a:jline:jline:2.3
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cpe:2.3:a:jline:jline:2.4
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cpe:2.3:a:jline:jline:2.5
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cpe:2.3:a:jline:jline:2.6
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cpe:2.3:a:jline:jline:2.7
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cpe:2.3:a:jline:jline:2.8
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cpe:2.3:a:jline:jline:2.9
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cpe:2.3:a:jline:jline:3.0.0
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cpe:2.3:a:jline:jline:3.0.1
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cpe:2.3:a:jline:jline:3.0.2
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cpe:2.3:a:jline:jline:3.0.3
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cpe:2.3:a:jline:jline:3.0.4
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cpe:2.3:a:jline:jline:3.1.0
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cpe:2.3:a:jline:jline:3.1.1
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cpe:2.3:a:jline:jline:3.1.2
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cpe:2.3:a:jline:jline:3.1.3
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cpe:2.3:a:jline:jline:3.10.0
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cpe:2.3:a:jline:jline:3.11.0
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cpe:2.3:a:jline:jline:3.12.0
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cpe:2.3:a:jline:jline:3.12.1
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cpe:2.3:a:jline:jline:3.13.0
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cpe:2.3:a:jline:jline:3.13.1
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cpe:2.3:a:jline:jline:3.13.2
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cpe:2.3:a:jline:jline:3.13.3
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cpe:2.3:a:jline:jline:3.14.0
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cpe:2.3:a:jline:jline:3.14.1
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cpe:2.3:a:jline:jline:3.15.0
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cpe:2.3:a:jline:jline:3.16.0
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cpe:2.3:a:jline:jline:3.17.0
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cpe:2.3:a:jline:jline:3.17.1
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cpe:2.3:a:jline:jline:3.18.0
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cpe:2.3:a:jline:jline:3.19.0
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cpe:2.3:a:jline:jline:3.2.0
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cpe:2.3:a:jline:jline:3.20.0
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cpe:2.3:a:jline:jline:3.21.0
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cpe:2.3:a:jline:jline:3.22.0
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cpe:2.3:a:jline:jline:3.23.0
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cpe:2.3:a:jline:jline:3.24.0
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cpe:2.3:a:jline:jline:3.24.1
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cpe:2.3:a:jline:jline:3.25.0
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cpe:2.3:a:jline:jline:3.25.1
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cpe:2.3:a:jline:jline:3.26.0
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cpe:2.3:a:jline:jline:3.26.1
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cpe:2.3:a:jline:jline:3.26.2
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cpe:2.3:a:jline:jline:3.26.3
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cpe:2.3:a:jline:jline:3.27.0
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cpe:2.3:a:jline:jline:3.27.1
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cpe:2.3:a:jline:jline:3.28.0
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cpe:2.3:a:jline:jline:3.29.0
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cpe:2.3:a:jline:jline:3.3.0
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cpe:2.3:a:jline:jline:3.3.1
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cpe:2.3:a:jline:jline:3.30.0
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cpe:2.3:a:jline:jline:3.30.1
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cpe:2.3:a:jline:jline:3.30.10
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cpe:2.3:a:jline:jline:3.30.11
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cpe:2.3:a:jline:jline:3.30.12
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cpe:2.3:a:jline:jline:3.30.13
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cpe:2.3:a:jline:jline:3.30.2
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cpe:2.3:a:jline:jline:3.30.3
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cpe:2.3:a:jline:jline:3.30.4
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cpe:2.3:a:jline:jline:3.30.5
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cpe:2.3:a:jline:jline:3.30.6
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cpe:2.3:a:jline:jline:3.30.7
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cpe:2.3:a:jline:jline:3.30.8
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cpe:2.3:a:jline:jline:3.30.9
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cpe:2.3:a:jline:jline:3.4.0
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cpe:2.3:a:jline:jline:3.5.0
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cpe:2.3:a:jline:jline:3.5.1
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cpe:2.3:a:jline:jline:3.5.2
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cpe:2.3:a:jline:jline:3.6.0
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cpe:2.3:a:jline:jline:3.6.1
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cpe:2.3:a:jline:jline:3.6.2
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cpe:2.3:a:jline:jline:3.7.0
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cpe:2.3:a:jline:jline:3.7.1
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cpe:2.3:a:jline:jline:3.8.0
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cpe:2.3:a:jline:jline:3.8.1
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cpe:2.3:a:jline:jline:3.8.2
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cpe:2.3:a:jline:jline:3.9.0
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cpe:2.3:a:jline:jline:4.0.0
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cpe:2.3:a:jline:jline:4.0.1
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cpe:2.3:a:jline:jline:4.0.10
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cpe:2.3:a:jline:jline:4.0.11
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cpe:2.3:a:jline:jline:4.0.12
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cpe:2.3:a:jline:jline:4.0.13
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cpe:2.3:a:jline:jline:4.0.14
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cpe:2.3:a:jline:jline:4.0.15
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cpe:2.3:a:jline:jline:4.0.2
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cpe:2.3:a:jline:jline:4.0.3
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cpe:2.3:a:jline:jline:4.0.4
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cpe:2.3:a:jline:jline:4.0.5
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cpe:2.3:a:jline:jline:4.0.6
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cpe:2.3:a:jline:jline:4.0.7
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cpe:2.3:a:jline:jline:4.0.8
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cpe:2.3:a:jline:jline:4.0.9
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cpe:2.3:a:jline:jline:4.1.0
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cpe:2.3:a:jline:jline:4.1.1
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cpe:2.3:a:jline:jline:4.1.2
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cpe:2.3:a:jline:jline:4.1.3
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cpe:2.3:a:jline:jline:4.2.0