Dashboard / CVE-2026-34983

CVE-2026-34983

LOW
INFO Priority: 0.00 BB Relevance: 2/100
Published: 2026-04-09 Modified: 2026-10-26 First seen: 2026-10-29 Status: active

Description

Wasmtime is a runtime for WebAssembly. In 43.0.0, cloning a wasmtime::Linker is unsound and can result in use-after-free bugs. This bug is not controllable by guest Wasm programs. It can only be triggered by a specific sequence of embedder API calls made by the host. Specifically, the following steps must occur to trigger the bug clone a wasmtime::Linker, drop the original linker instance, use the new, cloned linker instance, resulting in a use-after-free. This vulnerability is fixed in 43.0.1.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
bytecodealliance wasmtime 43.0.0

References & Advisories (1)

Bug Bounty Relevance

2 / 100

CVSS Score

1.0 / 10.0 v4.0
CVSS:4.0/AV:P/AC:H/AT:P/PR:H/UI:A/VC:L/VI:L/VA:L/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

EPSS — Exploitation Probability

0.12%
Raw Score 0.001170
Percentile 1.6%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00117
2026-10-28
0.00117

Intelligence Sources

nvd ref →

External Links