CVE-2026-77422
highJLine 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 grep command in builtins/src/main/java/org/jline/builtins/PosixCommands.java accepts a user-controlled regular expression in grep(...) and, unless line-regexp mode is used, automatically adds a dot-star prefix and suffix before compiling it with Java's backtracking regular expression engine. The wrapping expands the backtracking search space, so a short nested-quantifier expression evaluated against non-matching input can consume excessive CPU and indefinitely block a command worker, including in remotely exposed shell sessions. This issue is fixed in versions 3.30.15 and 4.3.1.
CVSS:3.1/AV:N/AC:L/PR:N/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-r2xf-8xr9-62gw security-advisories@github.com
- https://github.com/jline/jline3/security/advisories/GHSA-r2xf-8xr9-62gw 134c704f-9b21-4f2e-91b3-4a467353bcc0