Preliminary research

How a single typo led to RCE in Firefox

AI-collected research leads through 2 October 2026, including bounded month-by-month reviews of selected social and community sources from January through September. Unranked, incomplete, not community-vetted, and subject to change.

Traces a one-character bitwise-operator error in Firefox WasmGC array forwarding through garbage collection and Ion-compiled WebAssembly to a use-after-free. Heap shaping and JIT primitives turn the bug into a demonstrated browser code-execution exploit.

In the archive

• Collected in the 2026 preliminary research sweep

Tags

• browser
• firefox
• webassembly
• jit
• use-after-free
• memory-corruption
• rce

This page is the archive's own catalogue record. The research is the work of its author, first published at the original source. Preserved copies are kept so the citation survives its host.