CVE-2026-126407
Wasmtime before 36.0.20 Denial of Service via Borrowed Resource Transfer
CVSS Score
4.8
EPSS Score
0.0%
EPSS Percentile
0th
Wasmtime before 36.0.20, 37.0.0 before 48.0.8, 49.0.0 before 49.0.5, and 50.0.0 before 50.0.1 allocates untracked host memory when a component receives a borrow of a resource it defines itself, bypassing the per-store handle limit. A malicious guest component can repeatedly transfer such borrowed resources to consume arbitrary host memory, causing denial of service.
| CWE | CWE-770 |
| Vendor | bytecodealliance |
| Product | wasmtime |
| Published | Nov 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
bytecodealliance / wasmtime
0 < 36.0.20
bytecodealliance / wasmtime
37.0.0 < 48.0.8
bytecodealliance / wasmtime
49.0.0 < 49.0.5
bytecodealliance / wasmtime
50.0.0 < 50.0.1