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Advisory record · GHSA-x84v-gj2h-g759

Guest controlled-size host heap allocation through WASIp3 streams

CVSS 6.9 MediumEPSS 0.0017 · 6th percentile

Published by the GitHub Advisory Database at 20 Aug 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, <46.0.3 || >=47.0.0, <47.0.446.0.3, 47.0.4
Identifiers
GHSA-x84v-gj2h-g759 · CVE-2026-115391 · RUSTSEC-2026-0268
Weakness (CWE)
CWE-770
Tags
Published
20 Aug 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 to before 46.0.3 and 47.0.0 to before 47.0.4 are affected. A guest program running inside Wasmtime can control the size of a host heap allocation through WASIp3 streams, which can cause excessive host memory use. The source gives few details on the exact impact or required conditions. Upgrade to Wasmtime 46.0.3 or 47.0.4, or later.

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
6.9 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:H CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0017, the 6th percentile, on 7 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.