Allocation of Resources Without Limits or Throttling Affecting org.jline:jline-remote-telnet package, versions [,3.30.14)[4.0.0,4.0.16)[4.1.0,4.2.1)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published21 Jun 2026
- disclosed18 Jun 2026
- creditMichał Majchrowicz, Marcin Wyczechowski
Introduced: 18 Jun 2026
CVE-2026-56741 (opens in a new tab)How to fix?
Upgrade org.jline:jline-remote-telnet to version 3.30.14, 4.0.16, 4.2.1 or higher.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the TelnetIO.handleNAWS() method, which does not check for upper bounds on requested dimensions. An attacker can cause CPU exhaustion by large NAWS (Negotiate About Window Size) requests with alternating large values over unauthenticated Telnet connections, triggering repeated, resource-intensive rendering cycles on the server.