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Advisory record · GHSA-c9gc-w9vx-w86p

Outgoing HTTP body write allows guest-driven host memory exhaustion

CVSS 6.9 MediumEPSS 0.0011 · 1st percentile

Published by the GitHub Advisory Database at 24 Sept 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
wasmtime-wasi-httpcrates.io>=0.0.0-0, <36.0.16 || >=37.0.0, <48.0.3 || >=49.0.0, <49.0.136.0.16, 48.0.3, 49.0.1
Identifiers
GHSA-c9gc-w9vx-w86p · CVE-2026-115388 · RUSTSEC-2026-0313
Weakness (CWE)
CWE-400
Tags
Published
24 Sept 2026
Updated
24 Oct 2026

Machine-written summary

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

Wasmtime's wasmtime-wasi-http crate is vulnerable in versions before 36.0.16, from 37.0.0 before 48.0.3, and from 49.0.0 before 49.0.1. The source gives few details beyond a title describing outgoing HTTP body writes allowing guest-driven host memory exhaustion, so the attack conditions are not specified. Upgrade wasmtime-wasi-http to 36.0.16, 48.0.3, or 49.0.1, 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
6.9 Medium 4.0 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0011, the 1st percentile, on 7 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.