CVE catalog

CVE-2026-77423

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Sep 23, 2026, 6:17:49 PM UTC
Updated: Sep 23, 2026, 7:19:16 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.46% · Oct 27, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	jline	sid	`1.0-3`	not affected
Debian	jline	forky	`1.0-3`	not affected
Debian	jline	trixie	`1.0-3`	not affected
Debian	jline	bookworm	`1.0-3`	not affected
Debian	jline2	sid	`2.14.6-6`	not affected
Debian	jline2	forky	`2.14.6-6`	not affected
Debian	jline2	trixie	`2.14.6-6`	not affected
Debian	jline2	bookworm	`2.14.6-5`	not affected
Debian	jline3	sid	`3.3.1-5`	vulnerable
Debian	jline3	forky	`3.3.1-5`	vulnerable
Debian	jline3	trixie	`3.3.1-4`	vulnerable
Debian	jline3	bookworm	`3.3.1-3`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	jline	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	jline	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	jline	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	jline	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Debian	jline2	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	jline2	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	jline2	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	jline2	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Debian	jline3	source	sid	`(unfixed)`	unimportant	Not reported	Not reported
Debian	jline3	source	forky	`(unfixed)`	unimportant	Not reported	Not reported
Debian	jline3	source	trixie	`(unfixed)`	unimportant	Not reported	Not reported
Debian	jline3	source	bookworm	`(unfixed)`	unimportant	Not reported	Not reported

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[libjline2-java]Unknown
Source package: [jline2]
Details (2)
- 2.14.6-5 · all · bookworm
  Not affected
  nvd · jline2 · debian · bookworm
- 2.14.6-5 · all · bookworm
  Not affected
  nvd · jline2 · debian · bookworm
[libjline3-java]Unknown
Source package: [jline3]
Details (2)
- 3.3.1-3 · all · bookworm
  Affected
  nvd · jline3 · debian · bookworm; nvd · jline3 · debian · 12
- 3.3.1-3 · all · bookworm
  Affected
  nvd · jline3 · debian · bookworm; nvd · jline3 · debian · 12
[libjline-java]Unknown
Source package: [jline]
Details (2)
- 1.0-3 · all · bookworm
  Not affected
  nvd · jline · debian · bookworm
- 1.0-3 · all · bookworm
  Not affected
  nvd · jline · debian · bookworm
[libjline-java-doc]Unknown
Source package: [jline]
Details (2)
- 1.0-3 · all · bookworm
  Not affected
  nvd · jline · debian · bookworm
- 1.0-3 · all · bookworm
  Not affected
  nvd · jline · debian · bookworm

[Debian 13 (Trixie)]

[libjline3-java]Unknown
Source package: [jline3]
Details (2)
- 3.3.1-4 · all · trixie
  Affected
  nvd · jline3 · debian · 13
- 3.3.1-4 · all · trixie
  Affected
  nvd · jline3 · debian · 13

Observed: Oct 23, 2026, 8:36:00 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]