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Advisory record · RUSTSEC-2026-0410

WebAssembly allocator shim corrupts memory on allocation failure

No CVSS score

Published by OSV at 16 Oct 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
zstd-syscrates.io>=2.0.9, <2.1.22.1.2
Identifiers
RUSTSEC-2026-0410
Published
16 Oct 2026
Updated
26 Oct 2026

Machine-written summary

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

Versions 2.0.9 up to but not including 2.1.2 of the zstd-sys crate are affected. On wasm32, its malloc and free shim did not check for allocation failure, so when the instance could not grow its memory, a small crafted zstd frame could make decompression overwrite the bottom of the module's linear memory. The corruption stays inside the WebAssembly sandbox. Upgrade zstd-sys to 2.1.2 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

No source has published a CVSS score for this record yet.

  • 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.