CVE-2026-53429

Missing Release of Memory after Effective Lifetime vulnerability in leandrocp mdex and mdexnative allows an attacker who controls a rendered document to cause a denial of service through unbounded native memory exhaustion. The native rendering code permanently leaks memory when rendering a docume...

CVE-2026-53427

Improper Neutralization of Input During Web Page Generation 'Cross-site Scripting' vulnerability in leandrocp MDEx allows stored or reflected cross-site scripting via attacker-controlled Markdown. When syntax highlighting and full info-string forwarding render: fullinfostring: true are enabled, t...

CVE-2026-54888

Uncontrolled Recursion vulnerability in leandrocp mdex allows denial of service via deeply nested Markdown input. mdex converts between an Elixir %MDEx.Document struct and Comrak's internal AST using two mutually recursive Rust functions, exdocumenttocomrakast and comrakasttoexdocument, in the NI...

CVE-2026-54888

The CVE-2026-54888 issue is a denial-of-service in mdex/mdex_native caused by uncontrolled recursion when converting Markdown to an AST across a NIF boundary. The root cause is missing maximum nesting depth in two mutual Rust functions (ex_document_to_comrak_ast and comrak_ast_to_ex_document), al...

CVE-2026-53429

Missing Release of Memory after Effective Lifetime vulnerability in leandrocp mdex and mdexnative allows an attacker who controls a rendered document to cause a denial of service through unbounded native memory exhaustion. The native rendering code permanently leaks memory when rendering a docume...

CVE-2026-53429

Affected software: mdex (0.11.0–0.12.3) and mdex_native (0.1.0–0.2.3). Root cause: native rendering path leaks memory by Box::leak of literal strings for each MDEx.EscapedTag node, with no cap on literal size or node count, causing unbounded memory growth per render and across renders. Trigger: r...

CVE-2026-53428 Unbounded memory allocation in highlight_lines range expansion in mdex

Memory Allocation with Excessive Size Value vulnerability in leandrocp mdex allows an unauthenticated attacker to cause a denial of service through unbounded memory allocation. comraknif::lumisadapter::LumisAdapter::parsehighlightlines in native/comraknif/src/lumisadapter.rs eagerly expands a...

CVE-2026-53427 Cross-site scripting in MDEx via unescaped highlight_lines_class code-fence attribute

Improper Neutralization of Input During Web Page Generation 'Cross-site Scripting' vulnerability in leandrocp MDEx allows stored or reflected cross-site scripting via attacker-controlled Markdown. When syntax highlighting and full info-string forwarding render: fullinfostring: true are enabled, t...