CVE-2026-77423

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{"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, 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."}], "id": "CVE-2026-77423", "lastModified": "2026-09-30T16:44:39.840", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-77423", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-24T14:10:41.490849Z", "version": "2.0.3"}}]}, "published": "2026-09-23T19:19:16.017", "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-2v9w-34q6-wpqx"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/jline/jline3/security/advisories/GHSA-2v9w-34q6-wpqx"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1333"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "org.jline/jline: JLine: Denial of Service via user-controlled regular expressions", "id": "2539649", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2539649"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1333", "details": ["A flaw was found in JLine. The built-in less viewer processes user-controlled search and display-filter patterns using Java's backtracking regular expression engine. A remote attacker could provide a specially crafted regular expression, leading to excessive CPU consumption and indefinitely blocking the session thread. This can result in a Denial of Service (DoS) for affected systems, especially in Telnet or SSH deployments where repeated sessions could exhaust worker pools."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-77423", "package_state": [{"cpe": "cpe:/a:redhat:jboss_fuse:7", "fix_state": "Out of support scope", "package_name": "jline", "product_name": "Red Hat Fuse 7"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-spark-operator-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th06-cpu-torch210-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th06-cpu-torch291-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th06-cuda130-torch210-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th06-cuda130-torch291-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th06-rocm64-torch291-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th-torch-cpu-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th-torch-cuda-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Affected", "package_name": "opendaylight", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}], "public_date": "2026-09-23T18:17:49Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-77423\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-77423\nhttps://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541\nhttps://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae\nhttps://github.com/jline/jline3/pull/2012\nhttps://github.com/jline/jline3/pull/2018\nhttps://github.com/jline/jline3/releases/tag/4.3.1\nhttps://github.com/jline/jline3/releases/tag/jline-3.30.15\nhttps://github.com/jline/jline3/security/advisories/GHSA-2v9w-34q6-wpqx"], "statement": "This is an Important denial-of-service vulnerability in the JLine built-in less viewer. Exploitation occurs when user-controlled regular expressions are processed, leading to excessive CPU consumption and potential session thread exhaustion. This risk is particularly relevant in Red Hat products utilizing JLine in interactive Telnet or SSH deployments, where repeated sessions could exhaust worker pools.", "threat_severity": "Important"}

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