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Advisory record · RUSTSEC-2026-0391

Data from an abandoned stream leaks into the next stream on a reused context

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
zstdcrates.io>=0.13.2, <0.13.4 || >=0.14.0-0, <0.14.30.13.4, 0.14.3
Identifiers
RUSTSEC-2026-0391
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.

Vulnerable versions of the zstd crate are 0.13.2 up to but not including 0.13.4, and 0.14.0 up to but not including 0.14.3. Applications that reuse one encoder or decoder context across streams can have data from an abandoned stream carried into the next one, including plaintext from one user appearing in another's output. Upgrade to zstd 0.13.4 or 0.14.3, 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.