{"id":"CVE-2026-77423","title":"JLine is a Java library for handling console input","summary":"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 less viewer passes user-controlled search and display-filter patterns from getPattern(boolean doDisplayPattern) in builtins/src/ma…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-1333"],"vendor":"jline","product":"jline3","affected":["jline3 >= 3.0.0, < 3.30.15","jline3 >= 4.0.0, < 4.3.1"],"published":"2026-09-23","updated":"2026-09-30","sourceUpdated":"2026-09-30T16:44:39.840","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77423","references":[{"url":"https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541","label":"security-advisories@github.com"},{"url":"https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae","label":"security-advisories@github.com"},{"url":"https://github.com/jline/jline3/pull/2012","label":"security-advisories@github.com"},{"url":"https://github.com/jline/jline3/pull/2018","label":"security-advisories@github.com"},{"url":"https://github.com/jline/jline3/releases/tag/4.3.1","label":"security-advisories@github.com"},{"url":"https://github.com/jline/jline3/releases/tag/jline-3.30.15","label":"security-advisories@github.com"},{"url":"https://github.com/jline/jline3/security/advisories/GHSA-2v9w-34q6-wpqx","label":"security-advisories@github.com"},{"url":"https://github.com/jline/jline3/security/advisories/GHSA-2v9w-34q6-wpqx","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77423.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-77423"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2539649"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-77423"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77423"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"epss":0.00461,"epssPercentile":0.39794,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-24T14:10:41.490849Z"},"ingestedAt":"2026-09-23T19:31:04.467Z","slug":"CVE-2026-77423","body":"## Overview\n\nJLine is a Java library for handling console input. From 3.0.0 until 3.30.15 and 4.3.1, the JLine built-in less viewer passes user-controlled search and display-filter patterns from getPattern(boolean doDisplayPattern) in builtins/src/main/java/org/jline/builtins/Less.java directly to Java's backtracking regular expression engine and repeatedly applies them to file content. A nested-quantifier expression evaluated against non-matching lines can consume excessive CPU and indefinitely block the session thread, and repeated sessions in Telnet or SSH deployments can exhaust a bounded worker pool. This issue is fixed in versions 3.30.15 and 4.3.1.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Fuse 7, Red Hat OpenShift AI (RHOAI), Red Hat OpenStack Platform 13 (Queens) · no fix planned: Red Hat Fuse 7, Red Hat OpenStack Platform 13 (Queens), Red Hat OpenShift AI (RHOAI) · updated 2026-09-29 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77423.json)","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":210165,"id":"CVE-2026-77423","ts":1790261098106,"field":"exploit_available","old":"false","new":"true"}]}