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Advisory record · GHSA-hmmr-87qq-258j

wasip3 UDP `send` can deliver a datagram to an address only allowed for receiving

CVSS 6.4 Medium

Published by the GitHub Advisory Database at 29 Oct 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
wasmtime-wasicrates.io>=48.0.0, <48.0.8 || >=49.0.0, <49.0.5 || >=50.0.0, <50.0.148.0.8, 49.0.5, 50.0.1
Identifiers
GHSA-hmmr-87qq-258j · RUSTSEC-2026-0420
Published
29 Oct 2026
Updated
30 Oct 2026

Machine-written summary

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

The wasmtime-wasi crate versions 48.0.0 before 48.0.8, 49.0.0 before 49.0.5, and 50.0.0 before 50.0.1 are affected. The UDP send path in wasip3 can deliver a datagram to an address that was only permitted for receiving. The source gives few details on the required attacker position or privileges. Upgrade to 48.0.8, 49.0.5, or 50.0.1 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
6.4 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N OSV
  • CISA KEV Not listed.
  • EPSS No score.

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.