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CVE-2026-44216— Wasmtime: Panic when allocating a table exceeding the size of the host's address space

Quick assessment

Affected
bytecodealliance wasmtime
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 5.9 · Medium EPSS 0.58% · P46

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 3

VendorProduct Version RangeStatus
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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2026-44216

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Vendor Advisories for CVE-2026-44216 (1)

IV. Related Vulnerabilities

Same product: wasmtime
Same vendor: bytecodealliance
Same weakness: CWE-770

V. Comments for CVE-2026-44216

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