{"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": "2026-09-23T18:11:25.998Z"}, "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"}}}}

{}

{"affected": [{"affectedData": [{"product": "jline3", "vendor": "jline", "versions": [{"status": "affected", "version": ">= 3.0.0, < 3.30.15"}, {"status": "affected", "version": ">= 4.0.0, < 4.3.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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."}], "id": "CVE-2026-77420", "lastModified": "2026-09-23T19:19:15.510", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-09-23T19:19:15.510", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541"}, {"source": "security-advisories@github.com", "url": "https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae"}, {"source": "security-advisories@github.com", "url": "https://github.com/jline/jline3/pull/2012"}, {"source": "security-advisories@github.com", "url": "https://github.com/jline/jline3/pull/2018"}, {"source": "security-advisories@github.com", "url": "https://github.com/jline/jline3/releases/tag/4.3.1"}, {"source": "security-advisories@github.com", "url": "https://github.com/jline/jline3/releases/tag/jline-3.30.15"}, {"source": "security-advisories@github.com", "url": "https://github.com/jline/jline3/security/advisories/GHSA-5q95-hrpc-m3w3"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1333"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"created": "2026-09-23T20:45:09.998499+00:00", "updated": "2026-09-23T20:45:09.998505+00:00", "vendors": []}