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Advisory record · GHSA-q49f-xg75-m9xw

Host panic when Winch compiler executes `table.fill`

CVSS 5.9 MediumEPSS 0.0036 · 29th 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-q49f-xg75-m9xw · CVE-2026-34946 · RUSTSEC-2026-0089
Weakness (CWE)
CWE-670
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 package is affected in versions before 36.0.7, from 37.0.0 before 42.0.2, and from 43.0.0 before 43.0.1. The Winch compiler can panic the host when it executes table.fill, and the source gives few further details on who can trigger it or what the impact is beyond the crash. Upgrade to 36.0.7, 42.0.2, or 43.0.1, depending on your release line.

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
5.9 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0036, the 29th 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.