CVE-2026-119133

CVSS 2.6 (low) · published 2026-10-29

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.

Weakness: CWE-758

Source: NVD CVE-2026-119133

References

• https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-p79w-pv2r-29qp
• https://www.vulncheck.com/advisories/wasmtime-47.0.0-before-48.0.6-and-49.0.0-before-49.0.3-misaligned-vmcontext-via-exception-tags

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