CVE-2026-44216: CWE-770: Allocation of Resources Without Limits or Throttling in bytecodealliance wasmtime
CVE-2026-44216 is a medium severity vulnerability in the Wasmtime WebAssembly runtime by bytecodealliance. It involves unchecked allocation logic for WebAssembly tables that can cause a panic due to arithmetic overflow when allocating extremely large tables under the WebAssembly memory64 proposal. This affects Wasmtime versions from 30. 0. 0 up to but not including 36. 0. 8, versions from 37. 0. 0 up to but not including 43. 0.
AI Analysis
Technical Summary
Wasmtime, a runtime for WebAssembly, had a vulnerability (CWE-770) in its allocation logic for WebAssembly tables where checked arithmetic would panic on overflow. This overflow can be triggered by allocating extremely large tables enabled by the WebAssembly memory64 proposal, which allows table sizes in the 64-bit range. The panic occurs during the creation of such large tables, for example when instantiating a WebAssembly module or component. Affected versions include >=30.0.0 and <36.0.8, >=37.0.0 and <43.0.2, and version 44.0.0. The vulnerability is resolved in versions 36.0.8, 43.0.2, and 44.0.1.
Potential Impact
The vulnerability can cause Wasmtime to panic and terminate execution when attempting to allocate extremely large WebAssembly tables, potentially leading to denial of service conditions. There is no indication of code execution or data corruption impacts. No known exploits in the wild have been reported.
Mitigation Recommendations
Fixed versions are available: 36.0.8, 43.0.2, and 44.0.1. Users should upgrade to one of these versions to remediate the vulnerability. Patch status is confirmed by the versioning information in the advisory. No additional mitigation steps are indicated.
CVE-2026-44216: CWE-770: Allocation of Resources Without Limits or Throttling in bytecodealliance wasmtime
Description
CVE-2026-44216 is a medium severity vulnerability in the Wasmtime WebAssembly runtime by bytecodealliance. It involves unchecked allocation logic for WebAssembly tables that can cause a panic due to arithmetic overflow when allocating extremely large tables under the WebAssembly memory64 proposal. This affects Wasmtime versions from 30. 0. 0 up to but not including 36. 0. 8, versions from 37. 0. 0 up to but not including 43. 0.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Wasmtime, a runtime for WebAssembly, had a vulnerability (CWE-770) in its allocation logic for WebAssembly tables where checked arithmetic would panic on overflow. This overflow can be triggered by allocating extremely large tables enabled by the WebAssembly memory64 proposal, which allows table sizes in the 64-bit range. The panic occurs during the creation of such large tables, for example when instantiating a WebAssembly module or component. Affected versions include >=30.0.0 and <36.0.8, >=37.0.0 and <43.0.2, and version 44.0.0. The vulnerability is resolved in versions 36.0.8, 43.0.2, and 44.0.1.
Potential Impact
The vulnerability can cause Wasmtime to panic and terminate execution when attempting to allocate extremely large WebAssembly tables, potentially leading to denial of service conditions. There is no indication of code execution or data corruption impacts. No known exploits in the wild have been reported.
Mitigation Recommendations
Fixed versions are available: 36.0.8, 43.0.2, and 44.0.1. Users should upgrade to one of these versions to remediate the vulnerability. Patch status is confirmed by the versioning information in the advisory. No additional mitigation steps are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-05T15:13:47.572Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a05e888ec166c07b0eee360
Added to database: 5/14/2026, 3:21:44 PM
Last enriched: 5/14/2026, 3:37:57 PM
Last updated: 5/15/2026, 6:30:41 AM
Views: 6
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