What is CVE-2022-39394?

CVE-2022-39394 is a low-severity vulnerability in Bytecodealliance Wasmtime, classified under Out-of-bounds Write. CVSS score: 3.8/10. Published 2022-11-10.

How severe is CVE-2022-39394?

Low severity. CVSS v3 base score is 3.8 out of 10.

Buffer overflow in Bytecodealliance Wasmtime

CVE-2022-39394

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.

Vulnerability class: Buffer Overflow

EPSS: 0.003 (23.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.8 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L.

Affected products

Bytecodealliance Wasmtime — versions < 2.0.2

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

security-advisories@github.com (Third Party Advisory)
security-advisories@github.com (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2022-39394?: CVE-2022-39394 is a low-severity vulnerability in Bytecodealliance Wasmtime, classified under Out-of-bounds Write. CVSS score: 3.8/10. Published 2022-11-10.
How severe is CVE-2022-39394?: Low severity. CVSS v3 base score is 3.8 out of 10.