CVE-2026-34942 Detail
Received
This CVE record has recently been published to the CVE List and has been included within the NVD dataset. DescriptionWasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime's implementation of transcoding strings into the Component Model's utf16 or latin1+utf16 encodings improperly verified the alignment of reallocated strings. This meant that unaligned pointers could be passed to the host for transcoding which would trigger a host panic. This panic is possible to trigger from malicious guests which transfer very specific strings across components with specific addresses. Host panics are considered a DoS vector in Wasmtime as the panic conditions are controlled by the guest in this situation. This vulnerability is fixed in 24.0.7, 36.0.7, 42.0.2, and 43.0.1. Metrics
NVD enrichment efforts reference publicly available information to associate
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CVSS 4.0 Severity and Vector Strings:
CNA: GitHub, Inc.
CVSS-B 5.9 MEDIUM
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
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Weakness Enumeration
Quick InfoCVE Dictionary Entry:CVE-2026-34942 NVD Published Date: 04/09/2026 NVD Last Modified: 04/09/2026 Source: GitHub, Inc. |
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