Is CVE-2026-34944 actively exploited?

CVE-2026-34944 has no public evidence of in-the-wild exploitation as of 2026-04-20.

What is the CVSS score for CVE-2026-34944?

CVE-2026-34944 has a CVSS score of 4.1 (MEDIUM severity). Vector: 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.

How do I patch CVE-2026-34944?

Patch guidance is available from bytecodealliance security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-34944.

CVE-2026-34944 - remediation guidance & executive summary

Q: Which products are affected by CVE-2026-34944?

4 products: bytecodealliance wasmtime, bytecodealliance wasmtime, bytecodealliance wasmtime, bytecodealliance wasmtime.

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 Metrics

Vector: 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
Complexity: low
Privileges: low
User Action: active
Confidentiality: undefined
Integrity: undefined
Availability: undefined
Weaknesses: CWE-248

Metadata

Primary Vendor: BYTECODEALLIANCE
Published: 4/9/2026
Last Modified: 4/20/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

bytecodealliance : wasmtimebytecodealliance : wasmtimebytecodealliance : wasmtimebytecodealliance : wasmtime

Remediation Guidance

Executive Summary

Cite this page

CVE-2026-34944. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2026-34944

View on NIST NVD

CVE-2026-34944 vulnerability