RUSTSEC-2026-0380Critical· 9.9▾ MidnightBit-packing in Cranelift compiler causes silent overflow and miscompilation
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 54.5 · likelihood 0 · exploitation 0
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Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-897f-g5gm-fmxm For more information see the GitHub-hosted security advisory.
wasmtime >= 37.0.0, < 43.0.0Upgrade to a patched release:
wasmtime 43.0.0Connected by shared product, vendor, weakness, or advisory.
CVE-2026-115889Critical· 9.9Wasmtime: Bit-packing in Cranelift compiler causes silent overflow and miscompilation
CVE-2026-115892Medium· 5.7Panic lowering a host-created component model stream into a guest that expects a different payload type
CVE-2026-115893Critical· 9.9Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_table` instruction
CVE-2026-115392High· 7.9Filesystem sandbox escape when paths or symlinks contain trailing slashes
CVE-2026-115393Low· 3.8Stores can mix up type indices between engines
CVE-2026-115391Medium· 5.8Guest controlled-size host heap allocation through WASIp3 streams