Description
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.
Published: 2026-10-22
Score: 1 Low
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Fri, 23 Oct 2026 00:45:00 +0000

Type Values Removed Values Added
Description 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.
Title 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
First Time appeared Bytecodealliance
Bytecodealliance wasmtime
Weaknesses CWE-787
CWE-843
CPEs cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*
Vendors & Products Bytecodealliance
Bytecodealliance wasmtime
References
Metrics threat_severity

None

cvssV3_1

{'score': 3.8, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L'}

cvssV4_0

{'score': 1, 'vector': 'CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N'}

threat_severity

Low


Subscriptions

Bytecodealliance Wasmtime
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-22T19:13:59.314Z

Reserved: 2026-10-22T11:27:18.001Z

Link: CVE-2026-115393

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-10-22T19:17:47.033

Modified: 2026-10-22T19:17:47.150

Link: CVE-2026-115393

cve-icon Redhat

Severity : Low

Publid Date: 2026-10-22T19:13:59Z

Links: CVE-2026-115393 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T03:30:15Z

Weaknesses
  • CWE-787

    Out-of-bounds Write

  • CWE-843

    Access of Resource Using Incompatible Type ('Type Confusion')