23 Oct 2026 15:48:27 UTC
JLine: ReDoS in Nano Editor Regex Search Mode
cve-program · CVE-2026-77421 · Published
CVE-2026-77421
JLine: ReDoS in Nano Editor Regex Search Mode
CVSS 3.1 6.5 MEDIUMCheck source for fixed versionsKEV status unknown
cve-program · CVE-2026-77421
PublishedJLine 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.
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