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Advisory record · GHSA-9pvw-hwfg-92h5

Panic lowering a host-created component model stream into a guest that expects a different payload type

CVSS 5.7 MediumEPSS 0.0043 · 37th percentile

Published by the GitHub Advisory Database at 19 Oct 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
wasmtimecrates.io>=46.0.0, <48.0.7 || >=49.0.0, <49.0.448.0.7, 49.0.4
Identifiers
GHSA-9pvw-hwfg-92h5 · CVE-2026-115892 · RUSTSEC-2026-0378
Weakness (CWE)
CWE-248 · CWE-843
Tags
Published
19 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 46.0.0 up to but not including 48.0.7, and 49.0.0 up to but not including 49.0.4, are affected. The description gives few details beyond a panic when lowering a host-created component model stream into a guest that expects a different payload type. Users should upgrade to Wasmtime 48.0.7 or 49.0.4.

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
5.7 Medium 4.0 CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0043, the 37th 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.