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Advisory record · RUSTSEC-2026-0400

Use-after-free of a dictionary after a one-shot call on a context with an open stream

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-safecrates.io>=3.0.1, <7.4.0 || >=8.0.0-0, <8.2.07.4.0, 8.2.0
Identifiers
RUSTSEC-2026-0400
Published
16 Oct 2026
Updated
2 Nov 2026

Machine-written summary

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

Versions of zstd-safe from 3.0.1 before 7.4.0, and from 8.0.0 before 8.2.0, are affected. A use-after-free can occur when an application uses one compression or decompression context for a stream left unfinished and then a one-shot call, causing later streaming output to include freed heap memory. Exploitation requires the application to mix streaming and one-shot calls on one context without a reset in between. Upgrade to zstd-safe 7.4.0 or 8.2.0.

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.