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CVE-2026-56741
7.5 HIGH
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Scope (S): Unchanged (U)
- Confidentiality (C): None (N)
- Integrity (I): None (N)
- Availability (A): High (H)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): Low (L)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): None (N)
- Modified Scope (MS): Unchanged (U)
- Modified Integrity (MI): None (N)
- Modified Availability (MA): High (H)
Activity log
- Created & dismissed (no matching packages found) suggestion
JLine: Unauthenticated Remote DoS via Unbounded Telnet NAWS Terminal Geometry
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.
References
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https://github.com/jline/jline3/security/advisories/GHSA-2r2c-cx56-8933 x_refsource_CONFIRM
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https://github.com/jline/jline3/pull/2000 x_refsource_MISC
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https://github.com/jline/jline3/releases/tag/4.0.16 x_refsource_MISC
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https://github.com/jline/jline3/releases/tag/4.2.1 x_refsource_MISC
Affected products
jline3
- ==>= 4.1.0, < 4.2.1
- ==< 3.30.14
- ==>= 4.0.0, < 4.0.16