{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-77420","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-08-20T19:59:59.603Z","datePublished":"2026-09-23T18:11:25.998Z","dateUpdated":"2026-09-29T02:05:26.410Z"},"containers":{"cna":{"title":"JLine: ReDoS via `HISTORY_IGNORE` Configuration Variable","problemTypes":[{"descriptions":[{"cweId":"CWE-1333","lang":"en","description":"CWE-1333: Inefficient Regular Expression Complexity","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":5.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"name":"https://github.com/jline/jline3/security/advisories/GHSA-5q95-hrpc-m3w3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/jline/jline3/security/advisories/GHSA-5q95-hrpc-m3w3"},{"name":"https://github.com/jline/jline3/pull/2012","tags":["x_refsource_MISC"],"url":"https://github.com/jline/jline3/pull/2012"},{"name":"https://github.com/jline/jline3/pull/2018","tags":["x_refsource_MISC"],"url":"https://github.com/jline/jline3/pull/2018"},{"name":"https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541","tags":["x_refsource_MISC"],"url":"https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541"},{"name":"https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae","tags":["x_refsource_MISC"],"url":"https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae"},{"name":"https://github.com/jline/jline3/releases/tag/4.3.1","tags":["x_refsource_MISC"],"url":"https://github.com/jline/jline3/releases/tag/4.3.1"},{"name":"https://github.com/jline/jline3/releases/tag/jline-3.30.15","tags":["x_refsource_MISC"],"url":"https://github.com/jline/jline3/releases/tag/jline-3.30.15"}],"affected":[{"vendor":"jline","product":"jline3","versions":[{"version":">= 3.0.0, < 3.30.15","status":"affected"},{"version":">= 4.0.0, < 4.3.1","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-23T18:11:25.998Z"},"descriptions":[{"lang":"en","value":"JLine is a Java library for handling console input. From 3.0.0 until 3.30.15 and 4.3.1, DefaultHistory.matchPatterns(String patterns, String line) in reader/src/main/java/org/jline/reader/impl/history/DefaultHistory.java converts the HISTORY_IGNORE configuration value into a Java regular expression while escaping only part of its syntax, allowing other regex metacharacters to reach the backtracking engine. An attacker who can control application or user configuration can supply a nested-quantifier expression that is reevaluated whenever a command is added to history, consuming excessive CPU and indefinitely blocking the reader thread. This issue is fixed in versions 3.30.15 and 4.3.1."}],"source":{"advisory":"GHSA-5q95-hrpc-m3w3","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/jline/jline3/security/advisories/GHSA-5q95-hrpc-m3w3","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-29T02:05:00.790615Z","id":"CVE-2026-77420","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-29T02:05:26.410Z"}}]}}