Bug 2563562 (CVE-2026-119133) - CVE-2026-119133 wasmtime: wasmtime: Undefined behavior via misaligned VMContext layout
Summary: CVE-2026-119133 wasmtime: wasmtime: Undefined behavior via misaligned VMConte...
Keywords:
Status: NEW
Alias: CVE-2026-119133
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-29 17:42 UTC by OSIDB Bzimport
Modified: 2026-10-29 18:07 UTC (History)
2 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-10-29 17:42:29 UTC 
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.
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