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Advisory record · GHSA-ph9c-7hw9-vhhw

JLine: ReDoS in Nano Editor Regex Search Mode

CVSS 6.5 MediumEPSS 0.0043 · 37th 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-builtinsMaven>=4.0.0, <4.3.1 || >=3.0.0, <3.30.154.3.1, 3.30.15
Identifiers
GHSA-ph9c-7hw9-vhhw · CVE-2026-77421
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.

JLine's jline-builtins Maven package is affected in versions 4.0.0 up to 4.3.1 and 3.0.0 up to 3.30.15, with fixed versions 4.3.1 and 3.30.15. When regex search mode is enabled in the nano editor, the search term is compiled as a Java regular expression without any timeout, so a crafted pattern can make the editor session hang at high CPU, a denial of service for that session. Users should upgrade to 4.3.1 or 3.30.15; the source describes no workaround.

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
6.5 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0043, the 37th percentile, on 5 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.