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.
Published: 2026-11-13
Score: 1 Low
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

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Tracking

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Advisories

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History

Fri, 13 Nov 2026 09:45:00 +0000

Type Values Removed Values Added
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.
Title Wasmtime 47.0.0 before 48.0.8 Denial of Service via TypedFunc Type-Check Panic
First Time appeared Bytecodealliance
Bytecodealliance wasmtime
Weaknesses CWE-617
CPEs cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*
Vendors & Products Bytecodealliance
Bytecodealliance wasmtime
References
Metrics cvssV3_1

{'score': 1.8, 'vector': 'CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L'}

cvssV4_0

{'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'}


Subscriptions

Bytecodealliance Wasmtime
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-13T09:35:42.943Z

Reserved: 2026-11-10T21:32:21.765Z

Link: CVE-2026-126408

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-11-13T10:17:45.823

Modified: 2026-11-13T10:17:45.963

Link: CVE-2026-126408

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-13T19:15:21Z

Weaknesses