# CVE-2026-44216: rust-wasmtime: Wasmtime is a runtime for WebAssembly

CVE-2026-44216 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-44216, released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-44216
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0032
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 14, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | rust-wasmtime Debian 14 | 36.0.8+dfsg-1 | [DEBIAN-CVE-2026-44216](https://patchblox.com/security/data/fix/linux/debian-cve-2026-44216.md) | May 15, 2026 |
| Linux | tree-sitter sles 16.0 | 0.26.8-160000.2.1 | [SUSE-SU-2026:22002-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22002-1.md) | Jun 1, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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