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CVE-2026-77421

JLine: ReDoS in Nano Editor Regex Search Mode

CVSS 3.1 6.5 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-77421

Published

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 nano editor's regex search mode passes a user-controlled search term from doSearch(String text) in builtins/src/main/java/org/jline/builtins/Nano.java to Java's backtracking regular expression engine without a timeout or backtracking bound. A nested-quantifier expression evaluated against non-matching buffer content can consume excessive CPU and indefinitely block the editor session thread, and remote multi-user deployments can lose a worker thread for each affected session. This issue is fixed in versions 3.30.15 and 4.3.1.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-77421

Published

jline3

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "jline",
                    "product": "jline3",
                    "versions": [
                        {
                            "version": ">= 3.0.0, < 3.30.15",
                            "status": "affected"
                        },
                        {
                            "version": ">= 4.0.0, < 4.3.1",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON