7.5

CVE-2026-77422: JLine: ReDoS in Built-in grep Command Amplified by Automatic `.*` Wrapping

Awaiting analysis
AliasesUBUNTU-CVE-2026-77422DEBIAN-CVE-2026-77422CGA-326x-rrph-jcjx
Published 23-09-2026Last modified 24-09-2026

Vulnerability summary

CVE-2026-77422 is a high (CVSS 7.5) vulnerability in jline jline3. EPSS estimates a 0.60% chance of exploitation in the next 30 days, higher than 48.4% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.60%
0%100%
Low · +0.10 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 23-09-2026
    PublishedVulnerability first disclosed.
  2. 24-09-2026
    Last modifiedVulnerability information updated.

Description

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 metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.60%

Chance of exploitation in the next 30 days

Percentile

48%

Versus all other CVEs

30-day change

Increase +0.10 pp

From 0.50% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard53 products
  • akhq< 0.28.0-r9
  • apache-camel-karavan-devmode< 4.18.1-r13
  • apache-nifi-2.11< 2.11.0-r8
  • apache-polarisAll versions (No fix recorded)
  • apache-polaris-fipsAll versions (No fix recorded)
Wolfi11 products
  • akhq< 0.28.0-r9
  • apache-pulsar-4.2< 4.2.4-r6
  • celeborn-0.6All versions (No fix recorded)
  • druid< 37.0.0-r60
  • kafka-4.1< 4.1.2-r9
Ubuntu3 products
  • jlineAll versions (No fix recorded)
  • jline2All versions (No fix recorded)
  • jline3All versions (No fix recorded)
Debian1 product
  • jline3All versions (No fix recorded)
Jline1 product
  • jline3≥ 3.0.0, < 3.30.15 | ≥ 4.0.0, < 4.3.1
Org.jline1 product
  • jline-builtins≥ 4.0.0, < 4.3.1 | ≥ 3.0.0, < 3.30.15

6 vendors · 70 products

References

13 links
Show all 13 references