cve.bz

CVE-2022-39394

9.8 criticalEPSS 0.4%

Critical (9.8) in bytecodealliance wasmtime. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in wasmtime 1.0.2, 2.0.2.

Wasmtime is a standalone runtime for WebAssembly. Prior to version 2.0.2, there is a bug in Wasmtime's C API implementation where the definition of the `wasmtime_trap_code` does not match its declared signature in the `wasmtime/trap.h` header file. This discrepancy causes the function implementation to perform a 4-byte write into a 1-byte buffer provided by the caller. This can lead to three zero bytes being written beyond the 1-byte location provided by the caller. This bug has been patched and users should upgrade to Wasmtime 2.0.2. This bug can be worked around by providing a 4-byte buffer casted to a 1-byte buffer when calling `wasmtime_trap_code`. Users of the `wasmtime` crate are not affected by this issue, only users of the C API function `wasmtime_trap_code` are affected.

Severity

CVSS 3.1

9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
0.4% chance of exploitation in the next 30 days; higher than 29% of CVEs (scores of 2026-10-31)
CWE
CWE-787
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-h84q-m8rr-3v9qcrates.iowasmtime>=2.0.0 <2.0.22.0.2
GHSA-h84q-m8rr-3v9qcrates.iowasmtime<1.0.21.0.2
RUSTSEC-2022-0097crates.iowasmtime>=0.0.0-0 <1.0.2
>=2.0.0 <2.0.2		1.0.2, 2.0.2

References

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