CVE-2026-119133

Low

Description

Wasmtime 47.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a memory misalignment flaw in VMContext layout that causes undefined behavior when modules contain an odd number of exception tags. A WebAssembly module with an odd tag count misaligns subsequent host fields in embedders with exceptions enabled, although no exploitation path is currently known.

SeverityLow

CVSS2.6

Exploit probability—

ProductBytecodealliance Wasmtime

PublishedOct 29, 2026

First seenNov 4, 2026

Weakness typeCWE-758CWE-758

How to fix

Update

bytecodealliance wasmtime48.0.6, 49.0.3 or later

Vendor advisories

github.com/bytecodealliance/wasmtime/security/advisories/GHSA-p79w-pv2r-29qp

Affected products

Product	Affected versions	Fixed in
bytecodealliance wasmtime	47.0.0 ≤ v < 48.0.6, 49.0.0 ≤ v < 49.0.3	48.0.6, 49.0.3

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