CVE-2026-115383

5.9 mediumEPSS 0.2%

Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains an improper validation vulnerability that accepts components whose core modules import WebAssembly tags with a subtype of the original type. Malicious guests can mis-type exception object payloads to corrupt the GC heap, causing Wasmtime to panic when the exceptions proposal is enabled.

CVSS 4.0: 5.9CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 4.8CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H
EPSS: 0.2% chance of exploitation in the next 30 days; higher than 7% of CVEs (scores of 2026-10-25)
CWE: CWE-1287
Published: 2026-10-22
Modified: 2026-10-22
Record from: the NVD, synced 2026-10-23

Packages (OSV)

Advisory	Ecosystem	Package	Affected	Fixed in
RUSTSEC-2026-0325	crates.io	wasmtime	>=47.0.0 <48.0.4 >=49.0.0 <49.0.2	48.0.4, 49.0.2

References

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-cfhf-m2cr-62wj
https://www.vulncheck.com/advisories/wasmtime-47.0.0-before-48.0.4-and-49.0.0-before-49.0.2-gc-heap-corruption-via-tag-imports

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