mdex vulnerabilities

A vulnerability in the mdex and mdex_native libraries allows an unauthenticated attacker to cause a denial of service via unbounded memory allocation. The parse_highlight_lines function in the LumisAdapter component expands a user-controlled line range from a fenced code block without an upper bound, allocating huge vectors. A payload with a range like 1-2000000000 can exhaust host memory and abort the BEAM process.

A cross-site scripting (XSS) vulnerability was found in the MDEx library due to improper input neutralization in Markdown processing. An attacker can inject arbitrary HTML/JavaScript that executes in the browser of every user viewing the rendered output.

XSS vulnerability in the mdex library for Elixir allows an attacker to inject JavaScript code via improper validation of URL schemes in Markdown to Quill Delta processing. An attacker can supply a malicious link with javascript: scheme in Markdown text, which is copied verbatim to the Delta attribute and executed in the victim's browser when rendered to HTML.

A vulnerability in the mdex library (and mdex_native) allows a DoS attack by supplying a deeply nested Markdown document. Recursive conversion functions lack a maximum depth check, causing a C stack overflow and crashing the entire BEAM node.

A missing release of memory after effective lifetime vulnerability in mdex and mdex_native 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 document containing escaped-tag nodes, leading to unlimited memory consumption and process crash.

A vulnerability in the MDEx library for Elixir/Erlang allows exhaustion of the atom table by processing a specially crafted JSON document. The json_to_node/1 function creates new atoms for each unique node_type value, which are never garbage collected, leading to a crash of the entire BEAM virtual machine.