AIKIDO-2026-409601
mdex is vulnerable to Unbounded memory allocation
69
Medium Risk
This Affects:
mdexTL;DR
mdex allows unbounded memory allocation when rendering Markdown that contains a fenced code block with an oversized highlight_lines range in its info string. The native adapter (LumisAdapter::parse_highlight_lines in lumis_adapter.rs) eagerly expands the attacker-controlled inclusive line range into a Vec<usize> with no upper bound, allocating roughly 8 bytes per line.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
mdex is vulnerable to Unbounded memory allocation in versions 0.11.0 - 0.12.2.
How to fix this
Upgrade the mdex library to the patch version.
Links
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SOC 2Compliant
ISO 27001Compliant