--- id: CVE-2026-59887 title: >- linkify-it: linkify-it: Denial of Service via crafted mailto: links (CVE-2026-59887) summary: >- A flaw was found in linkify-it, a library for recognizing links. A remote attacker could exploit this vulnerability by providing specially crafted user text. The mailto: schema validator, when processing this input, can be repeatedly invok… 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' cvssSource: vendor cwe: - CWE-1333 - CWE-407 vendor: Red Hat product: Cluster Observability Operator 1.5.3 affected: - node_healthcheck_operator - openshift_pipelines - ceph_storage 9 - openshift_ai_rhoai - openshift_container_platform 4 - openshift_data_foundation 4 - openshift_dev_spaces - self_service_automation_portal 2 - cluster_observability_operator 1.5.3 - migration_toolkit_for_virtualization 2.10 - migration_toolkit_for_virtualization 2.11 - openshift_ai 3.4 - openshift_dev_spaces 3.30 patched: - cluster_observability_operator 1.5.3 - migration_toolkit_for_virtualization 2.10 - migration_toolkit_for_virtualization 2.11 - openshift_ai 3.4 - openshift_dev_spaces 3.30 published: '2026-07-08' updated: '2026-10-22' sourceUpdated: '2026-10-22T22:34:49+00:00' source: CSAF sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59887.json' references: - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59887.json - url: 'https://access.redhat.com/security/cve/CVE-2026-59887' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2498146' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-59887' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-59887' - url: >- https://github.com/markdown-it/linkify-it/commit/105e5d77f7d119871d2b2d86ed208568eb3e7ffe - url: 'https://github.com/markdown-it/linkify-it/releases/tag/5.0.2' - url: >- https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vm - url: 'https://access.redhat.com/errata/RHSA-2026:74609' - url: 'https://access.redhat.com/errata/RHSA-2026:83663' - url: 'https://access.redhat.com/errata/RHSA-2026:83662' - url: 'https://access.redhat.com/errata/RHSA-2026:84734' - url: 'https://access.redhat.com/errata/RHSA-2026:68754' - url: 'https://github.com/advisories/GHSA-v245-v573-v5vm' tags: - csaf - vex - red-hat - ghsa - npm epss: 0.00644 epssPercentile: 0.50659 aliases: - GHSA-v245-v573-v5vm ecosystem: npm ingestedAt: '2026-07-21T19:53:40.199Z' --- ## Overview A flaw was found in linkify-it, a library for recognizing links. A remote attacker could exploit this vulnerability by providing specially crafted user text. The mailto: schema validator, when processing this input, can be repeatedly invoked, leading to excessive CPU consumption. This can result in a Denial of Service (DoS) for the affected system. ## Vendor advisories - **RHSA-2026:74609** · Red Hat · fixed in: Cluster Observability Operator 1.5.3 · released 2026-10-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:74609) - **RHSA-2026:83663** · Red Hat · fixed in: Migration Toolkit for Virtualization 2.10 · released 2026-10-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:83663) - **RHSA-2026:83662** · Red Hat · fixed in: Migration Toolkit for Virtualization 2.11 · released 2026-10-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:83662) - **RHSA-2026:84734** · Red Hat · fixed in: Red Hat OpenShift AI 3.4 · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:84734) - **RHSA-2026:68754** · Red Hat · fixed in: Red Hat OpenShift Dev Spaces 3.30 · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68754) - **Red Hat VEX** · Important · affected: Node HealthCheck Operator, OpenShift Pipelines, Red Hat Ceph Storage 9, Red Hat OpenShift AI (RHOAI), Red Hat OpenShift Container Platform 4, Red Hat Openshift Data Foundation 4, … · no fix planned: Red Hat Ceph Storage 9, Node HealthCheck Operator, OpenShift Pipelines, Red Hat OpenShift AI (RHOAI), … · updated 2026-10-22 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59887.json) **linkify-it: linkify-it: Denial of Service via crafted mailto: links** — rated Important by Red Hat. Released 2026-07-08, updated 2026-10-22. Affected: - Node HealthCheck Operator - OpenShift Pipelines - Red Hat Ceph Storage 9 - Red Hat OpenShift AI (RHOAI) - Red Hat OpenShift Container Platform 4 - Red Hat Openshift Data Foundation 4 - Red Hat OpenShift Dev Spaces - Self-service automation portal 2 Fixed: - Cluster Observability Operator 1.5.3 - Migration Toolkit for Virtualization 2.10 - Migration Toolkit for Virtualization 2.11 - Red Hat OpenShift AI 3.4 - Red Hat OpenShift Dev Spaces 3.30 No fix planned: - Red Hat Ceph Storage 9 - Node HealthCheck Operator - OpenShift Pipelines - Red Hat OpenShift AI (RHOAI) - Red Hat OpenShift Container Platform 4 - Red Hat Openshift Data Foundation 4 - Red Hat OpenShift Dev Spaces Not affected: - Cluster Observability Operator 1.5.3 - Migration Toolkit for Virtualization 2.10 - Migration Toolkit for Virtualization 2.11 - Red Hat OpenShift AI 3.4 - Red Hat OpenShift Dev Spaces 3.30 - Red Hat Build of Podman Desktop - Red Hat Developer Hub - Red Hat Hardened Images - Red Hat OpenShift Container Platform 4 - Red Hat OpenShift Virtualization 4 ## Remediation Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:74609 Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://docs.redhat.com/en/documentation/migration_toolkit_for_virtualization/2.10/html-single/migrating_your_virtual_machines_to_red_hat_openshift_virtualization/index#assembly_upgrading-uninstalling-mtv_mtv https://access.redhat.com/errata/RHSA-2026:83663 Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://docs.redhat.com/en/documentation/migration_toolkit_for_virtualization/2.11/html-single/migrating_your_virtual_machines_to_red_hat_openshift_virtualization/index#assembly_upgrading-uninstalling-mtv_mtv https://access.redhat.com/errata/RHSA-2026:83662 Workarounds / mitigations: - 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. ## Package advisory (CVE-2026-59887) Affected packages: - `linkify-it <= 5.0.1` Patched in: - `linkify-it 5.0.2` Source: https://github.com/advisories/GHSA-v245-v573-v5vm