VDB
CVE-2026-34944
CVE-2026-34944
PUBLISHED
CVSS 4.099999904632568 MEDIUM
Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, On x86-64 platforms with SSE3 disabled Wasmtime's compilation of the f64x2.splat WebAssembly instruction with Cranelift may load 8 more bytes than is necessary. When signals-based-traps are disabled this can result in a uncaught segfault due to loading from unmapped guard pages. With guard pages disabled it's possible for out-of-sandbox data to be loaded, but this data is not visible to WebAssembly guests. This vulnerability is fixed in 24.0.7, 36.0.7, 42.0.2, and 43.0.1.
EPSS 0.01% · 1.9th percentile
Risk Scores
CVSS v4.0
4.099999904632568
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS Score
0.01%
1.9th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| bytecodealliance | wasmtime | < 24.0.7, >= 25.0.0, < 36.0.7, >= 37.0.0, < 42.0.2 |
| crates.io | wasmtime | 0, 43.0.0, 25.0.0 |
Timeline
- Apr 9, 2026 CVE Published
- Apr 10, 2026 Security Advisory
- Apr 20, 2026 CVE Updated
- May 18, 2026 EPSS Score
- May 19, 2026 EPSS Score
- May 20, 2026 EPSS Score
- May 21, 2026 EPSS Score
- May 22, 2026 EPSS Score
- May 23, 2026 EPSS Score
- May 24, 2026 EPSS Score
- May 25, 2026 EPSS Score
- May 26, 2026 EPSS Score