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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| bytecodealliance | wasmtime | >= 30.0.0, < 36.0.8, >= 37.0.0, < 43.0.2, 44.0.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | rust-wasmtime | 36.0.8+dfsg-1 | — |
| Debian 13 | rust-wasmtime | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | rust-wasmtime | No fix yet | — |
| Ubuntu 26.04 LTS | rust-wasmtime | No fix yet | — |
| Ubuntu 25.10 | rust-wasmtime | No fix yet | — |
| Ubuntu 24.04 LTS | rust-wasmtime | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | rust +18 | 1.97.1-2.hum1 | RHSA-2026:45341 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | tree-sitter | 0.26.8-160000.2.1 | SUSE-SU-2026:22002-1 |
| SLES 16.0 | tree-sitter | 0.26.8-160000.2.1 | SUSE-SU-2026:22002-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tree-sitter | 0.26.8-3.1 | openSUSE-SU-2026:10802-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | wizer | 11.0.3-r12 | — |
| Wolfi rolling | yara-x | 1.16.0-r1 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| crates.io | wasmtime | >= 30.0.0, < 36.0.8 | 36.0.8 | GHSA-p8xm-42r7-89xg |
| crates.io | wasmtime | >= 37.0.0, < 43.0.2 | 43.0.2 | GHSA-p8xm-42r7-89xg |
| crates.io | wasmtime | >= 30.0.0, < 36.0.8 · >= 37.0.0, < 43.0.2 · >= 44.0.0, < 44.0.1 | 36.0.8, 43.0.2, 44.0.1 | RUSTSEC-2026-0114 |
Advisories 3
- RHSA-2026:45341 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- SUSE-SU-2026:22002-1 Security update for tree-sitter SUSE / openSUSE Security Updates · Jun 9, 2026
- openSUSE-SU-2026:10802-1 libtree-sitter0_26-0.26.8-3.1 on GA media SUSE / openSUSE Security Updates · May 18, 2026