What is CVE-2026-35186?

CVE-2026-35186 is a high-severity vulnerability in Bytecodealliance Wasmtime, classified under CWE-789. CVSS score: 7.5/10. Published 2026-04-09.

How severe is CVE-2026-35186?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Bytecodealliance Wasmtime

CVE-2026-35186

Wasmtime is a runtime for WebAssembly. From 25.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime's Winch compiler backend contains a bug where translating the table.grow operator causes the result to be incorrectly typed. For 32-bit table…

EPSS: 0.002 (11.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Bytecodealliance Wasmtime — versions 43.0.0, >= 43.0.0, < 44.0.1, >= 25.0.0, < 36.0.7

Weakness classification (CWE)

CWE-789

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-35186?: CVE-2026-35186 is a high-severity vulnerability in Bytecodealliance Wasmtime, classified under CWE-789. CVSS score: 7.5/10. Published 2026-04-09.
How severe is CVE-2026-35186?: High severity. CVSS v3 base score is 7.5 out of 10.