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Advisory record · GHSA-cfhf-m2cr-62wj

Mis-typed WebAssembly tag imports can lead to GC heap corruption

CVSS 5.9 MediumEPSS 0.0018 · 8th percentile

Published by the GitHub Advisory Database at 2 Oct 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
wasmtimecrates.io>=47.0.0, <48.0.4 || >=49.0.0, <49.0.248.0.4, 49.0.2
Identifiers
GHSA-cfhf-m2cr-62wj · CVE-2026-115383 · RUSTSEC-2026-0325
Weakness (CWE)
CWE-1287
Tags
Published
2 Oct 2026
Updated
24 Oct 2026

Machine-written summary

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

Wasmtime versions 47.0.0 to before 48.0.4 and 49.0.0 to before 49.0.2 are affected. The advisory title indicates that mis-typed WebAssembly tag imports can lead to garbage-collected heap corruption, but the source gives few details on how an attacker would trigger it. Upgrade to Wasmtime 48.0.4 or 49.0.2.

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 (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0018, the 8th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 22 Oct 2026, 19:13 UTC Confirmed by the CVE List
  2. 22 Oct 2026, 19:17 UTC Confirmed by NVD
  3. 31 Oct 2026, 14:24 UTC First seen by agentprime
  4. 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.