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Advisory record · GHSA-5q95-hrpc-m3w3

JLine: ReDoS via `HISTORY_IGNORE` Configuration Variable

CVSS 5.5 MediumEPSS 0.0018 · 7th percentile

Published by the GitHub Advisory Database at 23 Sept 2026, 18:12 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.jline:jline-readerMaven>=4.0.0, <4.3.1 || >=3.0.0, <3.30.154.3.1, 3.30.15
Identifiers
GHSA-5q95-hrpc-m3w3 · CVE-2026-77420
Weakness (CWE)
CWE-1333
Tags
Published
23 Sept 2026
Updated
23 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Versions of org.jline:jline-reader from 3.0.0 before 3.30.15 and from 4.0.0 before 4.3.1 are affected. Where the HISTORY_IGNORE setting is supplied through user configuration or application settings, a crafted value containing regex metacharacters can cause catastrophic backtracking when a line is added to history, hanging the reader thread at high CPU. Upgrade to 3.30.15 or 4.3.1, or later. Avoid letting untrusted users set HISTORY_IGNORE.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.5 Medium 3.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0018, the 7th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.