CVE-2026-44216— Wasmtime: Panic when allocating a table exceeding the size of the host's address space
Possible ATT&CK Techniques 1AI
T1496 · Resource HijackingAffected Version Matrix 3
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| bytecodealliance | wasmtime | >= 30.0.0, < 36.0.8 | affected |
>= 37.0.0, < 43.0.2 | affected | ||
44.0.0 | affected |
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I. Basic Information for CVE-2026-44216
Vulnerability Information
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Vulnerability Title
Wasmtime: Panic when allocating a table exceeding the size of the host's address space
Source: NVD (National Vulnerability Database)
Vulnerability Description
Wasmtime is a runtime for WebAssembly. From 30.0.0 to 36.0.8, 43.0.2, and 44.0.1, Wasmtime's allocation logic for a WebAssembly table contained checked arithmetic which panicked on overflow. This overflow is possible to trigger, and thus panic, when a table with an extremely large size is allocated. This is possible with the WebAssembly memory64 proposal where tables can have sizes in the 64-bit range as opposed to the previous 32-bit range which would not overflow. The panic happens when attempting to create a very large table, such as when instantiating a WebAssembly module or component. This vulnerability is fixed in 36.0.8, 43.0.2, and 44.0.1.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
不加限制或调节的资源分配
Source: NVD (National Vulnerability Database)
Vulnerability Title
wasmtime 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
wasmtime是Bytecode Alliance开源的一个轻量级WebAssembly运行时。 wasmtime 30.0.0至36.0.8版本、43.0.2版本和44.0.1版本存在安全漏洞，该漏洞源于WebAssembly表的分配逻辑包含检查算术，在分配极大尺寸表时发生溢出并导致恐慌，此问题可通过WebAssembly memory64提案触发。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| bytecodealliance | wasmtime | >= 30.0.0, < 36.0.8 | - |
II. Public POCs for CVE-2026-44216
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same product: wasmtime
- CVE-2026-35195
Wasmtime has an out-of-bounds write or crash when transcodin - CVE-2026-35186
Wasmtime has an improperly masked return value from `table.g - CVE-2026-34988
Wasmtime leaks data between pooling allocator instances - CVE-2026-34987
Wasmtime with Winch compiler backend on aarch64 may allow a - CVE-2026-34983
Wasmtime has a use-after-free bug after cloning `wasmtime::L
Same vendor: bytecodealliance
- CVE-2026-35195
Wasmtime has an out-of-bounds write or crash when transcodin - CVE-2026-35186
Wasmtime has an improperly masked return value from `table.g - CVE-2026-34988
Wasmtime leaks data between pooling allocator instances - CVE-2026-34987
Wasmtime with Winch compiler backend on aarch64 may allow a - CVE-2026-34983
Wasmtime has a use-after-free bug after cloning `wasmtime::L
Same weakness: CWE-770
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WordPress Plugin WPGraphQL 1.3.5 Denial of Service - CVE-2026-44679
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Allocation of Resources Without Limits or Throttling in GitL - CVE-2026-1659
Allocation of Resources Without Limits or Throttling in GitL
V. Comments for CVE-2026-44216
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