Description
Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime contains a possible panic which can happen when a flags-typed component model value is lifted with the Val type. If bits are set outside of the set of flags the component model specifies that these bits should be ignored but Wasmtime will panic when this value is lifted. This panic only affects wasmtime's implementation of lifting into Val, not when using the flags! macro. This additionally only affects flags-typed values which are part of a WIT interface. This has the risk of being a guest-controlled panic within the host which Wasmtime considers a DoS vector. This vulnerability is fixed in 24.0.7, 36.0.7, 42.0.2, and 43.0.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| bytecodealliance | wasmtime | < 24.0.7, >= 25.0.0, < 36.0.7, >= 37.0.0, < 42.0.2, >= 43.0.0, < 44.0.1 | — |
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 | 36.0.7+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 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tree-sitter | 0.26.8-2.1 | openSUSE-SU-2026:10715-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | wash | No fix yet | — |
| Wolfi rolling | wasmcloud | 2.0.4-r0 | — |
| Wolfi rolling | wizer | 11.0.3-r10 | — |
| Wolfi rolling | yara-x | 1.15.0-r2 | — |
| Wolfi rolling | zed | 0.228.0-r3 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| crates.io | wasmtime | < 24.0.7 | 24.0.7 | GHSA-m758-wjhj-p3jq |
| crates.io | wasmtime | >= 25.0.0, < 36.0.7 | 36.0.7 | GHSA-m758-wjhj-p3jq |
| crates.io | wasmtime | >= 37.0.0, < 42.0.2 | 42.0.2 | GHSA-m758-wjhj-p3jq |
| crates.io | wasmtime | >= 43.0.0, < 43.0.1 | 43.0.1 | GHSA-m758-wjhj-p3jq |
| crates.io | wasmtime | >= 0.0.0-0, < 24.0.7 · >= 25.0.0, < 36.0.7 · >= 37.0.0, < 42.0.2 · >= 43.0.0, < 43.0.1 | 24.0.7, 36.0.7, 42.0.2, 43.0.1 | RUSTSEC-2026-0085 |
Advisories 1
- openSUSE-SU-2026:10715-1 libtree-sitter0_26-0.26.8-2.1 on GA media SUSE / openSUSE Security Updates · May 7, 2026