{"document":{"aggregate_severity":{"namespace":"https://access.redhat.com/security/updates/classification/","text":"Moderate"},"category":"csaf_vex","csaf_version":"2.0","distribution":{"text":"Copyright © Red Hat, Inc. All rights reserved.","tlp":{"label":"WHITE","url":"https://www.first.org/tlp/"}},"lang":"en","notes":[{"category":"legal_disclaimer","text":"This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.","title":"Terms of Use"}],"publisher":{"category":"vendor","contact_details":"https://access.redhat.com/security/team/contact/","issuing_authority":"Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.","name":"Red Hat Product Security","namespace":"https://www.redhat.com"},"references":[{"category":"self","summary":"Canonical URL","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77421.json"}],"title":"org.jline/jline-builtins: JLine: Denial of Service in Nano Editor Regex Search","tracking":{"current_release_date":"2026-09-24T10:51:18+00:00","generator":{"date":"2026-09-24T10:51:18+00:00","engine":{"name":"Red Hat 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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.","title":"Vulnerability description"},{"category":"summary","text":"org.jline/jline-builtins: JLine: Denial of Service in Nano Editor Regex Search","title":"Vulnerability summary"},{"category":"other","text":"Red Hat rates this issue as Moderate severity for the following reasons:\n\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.\n\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.","title":"Statement"},{"category":"general","text":"The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.","title":"CVSS score applicability"}],"product_status":{"known_affected":["red_hat_amq_broker_7:jline-builtins","red_hat_amq_broker_7:jline-reader","red_hat_fuse_7:jline-builtins","red_hat_fuse_7:jline-reader","red_hat_openshift_ai_(rhoai):rhoai/odh-spark-operator-rhel9","red_hat_openshift_ai_(rhoai):rhoai/odh-th-torch-cpu-py312-rhel9","red_hat_openshift_ai_(rhoai):rhoai/odh-th-torch-cuda-py312-rhel9","red_hat_openshift_ai_(rhoai):rhoai/odh-th06-cpu-torch210-py312-rhel9","red_hat_openshift_ai_(rhoai):rhoai/odh-th06-cpu-torch291-py312-rhel9","red_hat_openshift_ai_(rhoai):rhoai/odh-th06-cuda130-torch210-py312-rhel9","red_hat_openshift_ai_(rhoai):rhoai/odh-th06-cuda130-torch291-py312-rhel9","red_hat_openshift_ai_(rhoai):rhoai/odh-th06-rocm64-torch291-py312-rhel9","red_hat_openstack_platform_13_(queens):opendaylight","red_hat_openstack_platform_13_(queens):opendaylight.src"]},"references":[{"category":"self","summary":"Canonical URL","url":"https://access.redhat.com/security/cve/CVE-2026-77421"},{"category":"external","summary":"RHBZ#2539623","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2539623"},{"category":"external","summary":"https://www.cve.org/CVERecord?id=CVE-2026-77421","url":"https://www.cve.org/CVERecord?id=CVE-2026-77421"},{"category":"external","summary":"https://nvd.nist.gov/vuln/detail/CVE-2026-77421","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77421"},{"category":"external","summary":"https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541","url":"https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541"},{"category":"external","summary":"https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae","url":"https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae"},{"category":"external","summary":"https://github.com/jline/jline3/pull/2012","url":"https://github.com/jline/jline3/pull/2012"},{"category":"external","summary":"https://github.com/jline/jline3/pull/2018","url":"https://github.com/jline/jline3/pull/2018"},{"category":"external","summary":"https://github.com/jline/jline3/releases/tag/4.3.1","url":"https://github.com/jline/jline3/releases/tag/4.3.1"},{"category":"external","summary":"https://github.com/jline/jline3/releases/tag/jline-3.30.15","url":"https://github.com/jline/jline3/releases/tag/jline-3.30.15"},{"category":"external","summary":"https://github.com/jline/jline3/security/advisories/GHSA-ph9c-7hw9-vhhw","url":"https://github.com/jline/jline3/security/advisories/GHSA-ph9c-7hw9-vhhw"}],"release_date":"2026-09-23T18:07:21.134000+00:00","remediations":[{"category":"workaround","details":"Do not expose the JLine built-in nano editor to untrusted users. 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