{"id":"CVE-2026-77422","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-77422","generatedAt":"2026-10-28T00:18:50.153Z","title":"The wrapping expands the backtracking search space, so a short nested-quantifier expression evaluated against non-matching input can consume excessive CPU and indefinitely block a command worker, including in remotely exposed shell sessions.","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 grep command in builtins/src/main/java/org/jline/builtins/PosixCommands.java accepts a user-controlled regular expression in grep(...) and, unless line-regexp mode is used, automatically adds a dot-star prefix and suffix before compiling it with Java's backtracking regular expression engine. The wrapping expands the backtracking search space, so a short nested-quantifier expression evaluated against non-matching input can consume excessive CPU and indefinitely block a command worker, including in remotely exposed shell sessions. This issue is fixed in versions 3.30.15 and 4.3.1.","published":"2026-09-23T19:19:16.000Z","lastModified":"2026-09-30T16:44:40.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-1333"],"affected":[],"epss":{"score":0.00595,"percentile":0.48132,"date":"2026-10-26","history":[{"date":"2026-09-24","score":0.00496,"percentile":0.39903}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.60%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-23T19:19:16.000Z","detail":{"score":"7.5","severity":"HIGH","publishedAt":"2026-09-23T19:19:15.863Z"},"summary":"New CVE, high severity (CVSS 7.5)."}],"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-r2xf-8xr9-62gw","source":"security-advisories@github.com"},{"url":"https://github.com/jline/jline3/security/advisories/GHSA-r2xf-8xr9-62gw","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-77422","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}