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Advisory record · GHSA-m9w2-8782-2946

Host data leakage with 64-bit tables and Winch

CVSS 2.3 LowEPSS 0.0032 · 25th percentile

Published by the GitHub Advisory Database at 9 Apr 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
wasmtimecrates.io>=0.0.0-0, <36.0.7 || >=37.0.0, <42.0.2 || >=43.0.0, <43.0.136.0.7, 42.0.2, 43.0.1
Identifiers
GHSA-m9w2-8782-2946 · CVE-2026-34945 · RUSTSEC-2026-0086
Weakness (CWE)
CWE-681
Tags
Published
9 Apr 2026
Updated
12 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The wasmtime crate is vulnerable in versions before 36.0.7, from 37.0.0 before 42.0.2, and from 43.0.0 before 43.0.1. The source gives few details: it describes host data leakage involving 64-bit tables when using the Winch compiler, and points to the upstream GitHub advisory for more information. Upgrade to 36.0.7, 42.0.2, 43.0.1 or a later patched release.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
2.3 Low 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0032, the 25th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:24 UTC First seen by agentprime
  2. 31 Oct 2026, 14:24 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.