High 7.5Published Sep 23, 2026

CVE-2026-77423JLine: ReDoS in Built-in Less Viewer Search

Updated under an hour ago (2026-10-19 08:20 UTC)

Does this affect you?

It affects jline3. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for jline3

Exploited in the last 30 days

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 less viewer passes user-controlled search and display-filter patterns from getPattern(boolean doDisplayPattern) in builtins/src/main/java/org/jline/builtins/Less.java directly to Java's backtracking regular expression engine and repeatedly applies them to file content. A nested-quantifier expression evaluated against non-matching lines can consume excessive CPU and indefinitely block the session thread, and repeated sessions in Telnet or SSH deployments can exhaust a bounded worker pool. This issue is fixed in versions 3.30.15 and 4.3.1.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/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 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

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-2v9w-34q6-wpqxx-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.