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From: Salvatore Bonaccorso <carnil@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: jline3: CVE-2026-56740 CVE-2026-56741
Message-ID: <178565427756.2777076.2886309827973612770.reportbug@eldamar.lan>
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Date: Sun, 02 Aug 2026 09:04:37 +0200
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Source: jline3
Version: 3.3.1-5
Severity: important
Tags: security upstream
Forwarded: https://github.com/jline/jline3/pull/2000
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>
Control: found -1 3.3.1-4

Hi,

The following vulnerabilities were published for jline3.

CVE-2026-56740[0]:
| 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.


CVE-2026-56741[1]:
| 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.


If you fix the vulnerabilities please also make sure to include the
CVE (Common Vulnerabilities & Exposures) ids in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-56740
    https://www.cve.org/CVERecord?id=CVE-2026-56740
    https://github.com/jline/jline3/security/advisories/GHSA-47qp-hqvx-6r3f
[1] https://security-tracker.debian.org/tracker/CVE-2026-56741
    https://www.cve.org/CVERecord?id=CVE-2026-56741
    https://github.com/jline/jline3/security/advisories/GHSA-2r2c-cx56-8933
[2] https://github.com/jline/jline3/pull/2000

Regards,
Salvatore
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