CVE-2026-35201: rdiscount has an Out-of-bounds Read

April 6, 2026

A signed length truncation bug causes an out-of-bounds read in the default Markdown parse path. Inputs larger than INT_MAX are truncated to a signed int before entering the native parser, allowing the parser to read past the end of the supplied buffer and crash the process

References

github.com/advisories/GHSA-6r34-94wq-jhrc
github.com/davidfstr/rdiscount
github.com/davidfstr/rdiscount/commit/b1a16445e92e0d12c07594dedcdc56f80b317761
github.com/davidfstr/rdiscount/security/advisories/GHSA-6r34-94wq-jhrc
nvd.nist.gov/vuln/detail/CVE-2026-35201

Code Behaviors & Features

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