CVE-2026-115383
mediumpriority · track · 19EPSS 0.002 · 8 %ileUSEPSS · scored 2026-10-28
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.1–5.9
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- RUSTSEC-2026-0325Mis-typed WebAssembly tag imports can lead to GC heap corruption2026-10-02vendor · osvUS
This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-cfhf-m2cr-62wj For more information see the GitHub-hosted security advisory.
also known as (1)
Other names and identifiers for this entity.
sources
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references (2) nvd
External citations — patches, advisories, analysis.
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