CVE-2026-77421

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{"bugzilla": {"description": "org.jline/jline-builtins: JLine: Denial of Service in Nano Editor Regex Search", "id": "2539623", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2539623"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1333", "details": ["A flaw was found in the JLine built-in nano editor's regular expression (regex) search mode. A remote attacker could exploit this by providing a specially crafted search term. This could lead to excessive central processing unit (CPU) consumption, causing the editor session to become unresponsive and potentially leading to a denial of service (DoS) for affected users or worker threads in multi-user deployments."], "mitigation": {"lang": "en:us", "value": "Do not expose the JLine built-in nano editor to untrusted users. If applications embedding JLine must provide an interactive editor, disable the regex search mode or restrict editor access to authenticated and trusted users only."}, "name": "CVE-2026-77421", "package_state": [{"cpe": "cpe:/a:redhat:amq_broker:7", "fix_state": "Fix deferred", "package_name": "jline-builtins", "product_name": "Red Hat AMQ Broker 7"}, {"cpe": "cpe:/a:redhat:amq_broker:7", "fix_state": "Fix deferred", "package_name": "jline-reader", "product_name": "Red Hat AMQ Broker 7"}, {"cpe": "cpe:/a:redhat:jboss_fuse:7", "fix_state": "Out of support scope", "package_name": "jline-builtins", "product_name": "Red Hat Fuse 7"}, {"cpe": "cpe:/a:redhat:jboss_fuse:7", "fix_state": "Fix deferred", "package_name": "jline-reader", "product_name": "Red Hat Fuse 7"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-spark-operator-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-th06-cpu-torch210-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-th06-cpu-torch291-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-th06-cuda130-torch210-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-th06-cuda130-torch291-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-th06-rocm64-torch291-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-th-torch-cpu-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-th-torch-cuda-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Out of support scope", "package_name": "opendaylight", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}], "public_date": "2026-09-23T18:07:21Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-77421\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-77421\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-ph9c-7hw9-vhhw"], "statement": "Red Hat rates this issue as Moderate severity for the following reasons:\nConditions for exploitation: This vulnerability requires an authenticated user to actively type or paste a specially crafted regular expression into the JLine built-in nano editor's search prompt. Unlike a configuration-based attack, the malicious input must be provided interactively during a live editor session. Red Hat's CVSS score reflects this by including UI:R (User Interaction Required), which differs from the upstream CNA score that omits it.\nImpact limitations: Successful exploitation results only in a Denial of Service (DoS) through excessive CPU consumption on the editor session thread. There is no impact on data confidentiality or integrity. In single-user scenarios, only the attacker's own session is blocked; in multi-user deployments a worker thread per affected session may be lost, but this does not compromise system-level availability.", "threat_severity": "Moderate"}

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