CVE-2026-126408

low

Description

Wasmtime 47.0.0 before 48.0.8, 49.0.0 before 49.0.5, and 50.0.0 before 50.0.1 contains an insufficient type-check in the TypedFunc embedder API for I31, Option<I31>, and Option<NoneRef> parameter or result types, reaching an unreachable!() path. A malicious guest module exporting a function that uses another anyref-hierarchy type can panic the host embedding, causing denial of service.

References

https://www.vulncheck.com/advisories/wasmtime-47.0.0-before-48.0.8-denial-of-service-via-typedfunc-type-check-panic

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-3982-jqvv-277m

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-125035

Details

Source: Mitre, NVD

Published: 2026-11-13

Updated: 2026-11-13

Risk Information

CVSS v2

Base Score: 1.2

Vector: CVSS2#AV:A/AC:H/Au:M/C:N/I:N/A:P

Severity: Low

CVSS v3

Base Score: 1.8

Vector: CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L

Severity: Low

CVSS v4

Base Score: 1

Vector: CVSS:4.0/AV:A/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Severity: Low

EPSS

EPSS: 0.00226