{"id":"CVE-2026-77421","state":"PUBLISHED","title":"JLine: ReDoS in Nano Editor Regex Search Mode","description":"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.","publishedAt":"2026-09-23T18:07:21.134Z","updatedAt":"2026-09-23T19:43:56.607Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["jline jline3"],"affected":[{"vendor":"jline","product":"jline3","versions":[{"version":">= 3.0.0, < 3.30.15","status":"affected"},{"version":">= 4.0.0, < 4.3.1","status":"affected"}]}],"references":["https://github.com/jline/jline3/security/advisories/GHSA-ph9c-7hw9-vhhw","https://github.com/jline/jline3/pull/2012","https://github.com/jline/jline3/pull/2018","https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541","https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae","https://github.com/jline/jline3/releases/tag/4.3.1","https://github.com/jline/jline3/releases/tag/jline-3.30.15"],"weaknesses":["CWE-1333"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/77xxx/CVE-2026-77421.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-77421","state":"PUBLISHED","datePublished":"2026-09-23T18:07:21.134Z","dateUpdated":"2026-09-23T19:43:56.607Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-20T19:59:59.603Z"},"containers":{"cna":{"title":"JLine: ReDoS in Nano Editor Regex Search Mode","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, 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."}],"affected":[{"vendor":"jline","product":"jline3","versions":[{"version":">= 3.0.0, < 3.30.15","status":"affected"},{"version":">= 4.0.0, < 4.3.1","status":"affected"}]}],"references":[{"url":"https://github.com/jline/jline3/security/advisories/GHSA-ph9c-7hw9-vhhw","name":"https://github.com/jline/jline3/security/advisories/GHSA-ph9c-7hw9-vhhw","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/jline/jline3/pull/2012","name":"https://github.com/jline/jline3/pull/2012","tags":["x_refsource_MISC"]},{"url":"https://github.com/jline/jline3/pull/2018","name":"https://github.com/jline/jline3/pull/2018","tags":["x_refsource_MISC"]},{"url":"https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541","name":"https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541","tags":["x_refsource_MISC"]},{"url":"https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae","name":"https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae","tags":["x_refsource_MISC"]},{"url":"https://github.com/jline/jline3/releases/tag/4.3.1","name":"https://github.com/jline/jline3/releases/tag/4.3.1","tags":["x_refsource_MISC"]},{"url":"https://github.com/jline/jline3/releases/tag/jline-3.30.15","name":"https://github.com/jline/jline3/releases/tag/jline-3.30.15","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1333","lang":"en","description":"CWE-1333: Inefficient Regular Expression Complexity","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-23T18:07:21.134Z"},"source":{"advisory":"GHSA-ph9c-7hw9-vhhw","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-23T19:05:07.485942Z","id":"CVE-2026-77421","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-23T19:43:56.607Z"}}]}}}