CVE-2026-53429 Unbounded native memory leak in mdex escaped-tag rendering enables unauthenticated denial of service

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-2026-53428: Memory Allocation with Excessive Size Value

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-2026-54888: Uncontrolled Recursion

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-2026-53427: Improper Neutralization of Input During Web Page Generation

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-2026-53429: Missing Release of Memory after Effective Lifetime

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...