CVE-2026-34944
MEDIUM EPSS 13.4%
Published Apr 9, 20262mo ago · Modified Jun 17, 20261w ago
4.1 CVSS 4.0
Published Apr 9, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago
Description
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction A
Scope X
Threat Intelligence
EPSS Exploit Probability
13.4% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-248
Affected Products 4
| Vendor | Product | Version | Range |
|---|---|---|---|
| bytecodealliance | wasmtime | * | <24.0.7 |
| bytecodealliance | wasmtime | * | ≥25.0.0 – <36.0.7 |
| bytecodealliance | wasmtime | * | ≥37.0.0 – <42.0.2 |
| bytecodealliance | wasmtime | * | ≥43.0.0 – <43.0.1 |
References 1
- github.com https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-qqfj-4vcm-26hv
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.