CVE-2026-77421JLine: ReDoS in Nano Editor Regex Search Mode
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-1333
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 23, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
jline jline3 jline:jline3 (from the name) | from 3.0.0, < 3.30.15; from 4.0.0, < 4.3.1 | CNA record |
References
- https://github.com/jline/jline3/security/advisories/GHSA-ph9c-7hw9-vhhwx-refsource-confirm
- https://github.com/jline/jline3/pull/2012x-refsource-misc
- https://github.com/jline/jline3/pull/2018x-refsource-misc
- https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541x-refsource-misc
- https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206aex-refsource-misc
- https://github.com/jline/jline3/releases/tag/4.3.1x-refsource-misc
- https://github.com/jline/jline3/releases/tag/jline-3.30.15x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.