CVE-2026-115393

Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 before 46.0.2, and 47.0.0 before 47.0.3 contains a type confusion vulnerability because several Store APIs fail to validate that objects belong to the Store's Engine. Embedders mixing objects between Engines via Instance::new, StructRefPre::new, or Tag::new can trigger trampoline signature mismatches causing out-of-bounds stack writes, GC heap corruption, or panics.

CVSS v3 3.8 LOW

3.8^/10

CVSS v3 : LOW

Vector :

Exploitability : 0.3 / Impact : 3.4

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required HIGH

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-hgjw-h833-99q9
https://www.vulncheck.com/advisories/wasmtime-before-24.0.12-25.0.0-before-36.0.13-37.0.0-before-46.0.2-and-47.0.0-before-47.0.3-cross-engine-type-confusion

Configurations

No configuration.

History

22 Oct 2026, 19:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-22 19:17

Updated : 2026-10-29 13:17

NVD link : CVE-2026-115393

Mitre link : CVE-2026-115393

CVE.ORG link : CVE-2026-115393

JSON object : View

Products Affected

No product.

CWE

CWE-787

Out-of-bounds Write

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