High [CVE-2026-111758] Denial of Service via unclosed link reference definitions
This high-severity Red Hat Linux advisory covers CVE-2026-111758; related products: Red Hat Build of Podman Desktop, Red Hat Ceph Storage 9, Red Hat Developer Hub.
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Summary
Denial of Service via unclosed link reference definitions. Red Hat rates this important (CVSS 7.5).
Weakness: CWE-1046.
Affected products named by the advisory: Red Hat Build of Podman Desktop; Red Hat Ceph Storage 9; Red Hat Developer Hub; Red Hat Hardened Images; and 3 more.
Affected products named by the advisory: Red Hat OpenShift AI (RHOAI); Red Hat OpenShift Dev Spaces; Self-service automation portal 2.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 13 hours ago·verify at source
- 14.3.3
- 15.0.3
Official advisory · high-confidence parse· fetched 13 hours ago·verify at source
Mitigation checklist
- --- CME Mitigation Guidance (2026-10-20) --- Disclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure. The highest-value action is to disable the markdown-it reference block rule or avoid lazy string concatenation during multi-line link reference parsing: upgrade to markdown-it 14.3.3 and 15.0.3 (or the fixed Libgit/Forgejo/Ansible/Libgit2/Nextcloud/Markdownlint Cli/Rhoai/Odh Workbench Codeserver Datascience Cpu Py312 Rhel/Rhdh/Rhdh Hub Rhel/Devspaces/Code Rhel/Devspaces/Openvsx Rhel/Devspaces/Pluginregistry Rhel/Thrift/Ansible Automation Platform/Automation Portal/Rhoai/Odh Feature Server Rhel/Rhdh/Red Hat Developer Hub Backstage Plugin Orchestrator Backend/Ansible Automation Platform/Bootc Automation Portal Rhel/Rh Podman Desktop/Rhdh/Red Hat Developer Hub Backstage Plugin Lightspeed Backend/Redhat User Workloads/Mintmaker Renovate Image builds), which scan the source string directly by index position and enforce a 999-character limit on reference labels instead of lazily concatenating continuation lines, closing all 2 injection vectors (crafted multi-line unclosed link reference label, crafted multi-line unclosed link reference title). Until patched, this is a concern on applications parsing untrusted user-supplied Markdown with the reference block rule enabled, so disable the reference rule via configuration or restrict untrusted user Markdown input parsing. As a compensating measure, set per-process CPU time limits via RLIMIT_CPU to bound excessive processing time from quadratic string flattening and apply rate limiting and connection throttling to restrict repeated parsing requests. These controls limit blast radius and contain exploitation, but they do not fix the underlying quadratic cons-string flattening defect — apply the upstream patch to fully remediate. Highest-impact CME: CME-1316 Algorithmic Complexity Safeguards (Pattern/Regex Execution Limits) (high)
Official advisory · high-confidence parse· fetched 13 hours ago·verify at source
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