CVE-2026-77421
mediumJLine is a Java library for handling console input.
JLine is a Java library for handling console input. From 3.0.0 until 3.30.15 and 4.3.1, the JLine built-in nano editor's regex search mode passes a user-controlled search term from doSearch(String text) in builtins/src/main/java/org/jline/builtins/Nano.java to Java's backtracking regular expression engine without a timeout or backtracking bound. A nested-quantifier expression evaluated against non-matching buffer content can consume excessive CPU and indefinitely block the editor session thread, and remote multi-user deployments can lose a worker thread for each affected session. This issue is fixed in versions 3.30.15 and 4.3.1.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541 security-advisories@github.com
- https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae security-advisories@github.com
- https://github.com/jline/jline3/pull/2012 security-advisories@github.com
- https://github.com/jline/jline3/pull/2018 security-advisories@github.com
- https://github.com/jline/jline3/releases/tag/4.3.1 security-advisories@github.com
- https://github.com/jline/jline3/releases/tag/jline-3.30.15 security-advisories@github.com
- https://github.com/jline/jline3/security/advisories/GHSA-ph9c-7hw9-vhhw security-advisories@github.com