Wasmtime 47.0.0 before 48.0.8 Cross-Engine Type Confusion via StructType Supertype

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-126409
StatePUBLISHED
AssignerVulnCheck
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-13 10:17:46 UTC
Updated2026-11-13 10:17:46 UTC
DescriptionWasmtime 47.0.0 before 48.0.8, 49.0.0 before 49.0.5, and 50.0.0 before 50.0.1 contains a cross-engine type confusion vulnerability because StructType::with_finality_and_supertype does not validate that the supplied supertype belongs to the same Engine. Embedders using multiple engines that create a GC struct type with another engine's supertype can trigger runtime panics or GC heap corruption, causing denial of service; guest WebAssembly cannot trigger it.

Risk And Classification

Primary CVSS: v4.0 1.8 LOW from [email protected]

CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-843 | CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary1.8LOWCVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS1.8LOWCVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
3.1[email protected]Primary2LOWCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
3.1CNACVSS2LOWCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Attack Requirements
Present
Privileges Required
High
User Interaction
Active
Confidentiality
None
Integrity
None
Availability
Low
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
High
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Bytecodealliance Wasmtime affected 47.0.0 48.0.8 semver Not specified
CNA Bytecodealliance Wasmtime unaffected 48.0.8 semver Not specified
CNA Bytecodealliance Wasmtime affected 49.0.0 49.0.5 semver Not specified
CNA Bytecodealliance Wasmtime unaffected 49.0.5 semver Not specified
CNA Bytecodealliance Wasmtime affected 50.0.0 50.0.1 semver Not specified
CNA Bytecodealliance Wasmtime unaffected 50.0.1 semver Not specified

References

ReferenceSourceLinkTags
github.com/bytecodealliance/wasmtime/security/advisories/GHSA-qw58-7h65-... [email protected] github.com
www.vulncheck.com/advisories/wasmtime-47.0.0-before-48.0.8-cross-engine-type-co... [email protected] www.vulncheck.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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