CVE-2026-77420

{"id": "CVE-2026-77420", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-77420", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-29T02:05:00.790615Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "jline", "product": "jline3", "versions": [{"status": "affected", "version": ">= 3.0.0, < 3.30.15"}, {"status": "affected", "version": ">= 4.0.0, < 4.3.1"}]}]}], "published": "2026-09-23T19:19:15.510", "references": [{"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", "source": "security-advisories@github.com"}, {"url": "https://github.com/jline/jline3/security/advisories/GHSA-5q95-hrpc-m3w3", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-1333"}]}], "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."}], "lastModified": "2026-09-30T19:38:27.293", "sourceIdentifier": "security-advisories@github.com"}