Bug 2559338 (CVE-2026-115389) - CVE-2026-115389 wasmtime: wasmtime: Denial of Service via untracked host memory allocation in Val API
Summary: CVE-2026-115389 wasmtime: wasmtime: Denial of Service via untracked host memo...
Keywords:
Status: NEW
Alias: CVE-2026-115389
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-22 20:44 UTC by OSIDB Bzimport
Modified: 2026-10-22 20:59 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
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Description OSIDB Bzimport 2026-10-22 20:44:36 UTC 
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 does not adequately account for host allocations when lifting guest values through the dynamically-typed Val API, bypassing the hostcall fuel limit. A malicious WebAssembly guest can return crafted values that allocate at least ~100x more host memory than tracked, causing denial of service.
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