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Advisory record · RUSTSEC-2026-0399

Use-after-free through `init_using_cdict` and `init_using_ddict`

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>=3.0.0, <7.4.0 || >=8.0.0-0, <8.2.07.4.0, 8.2.0
Identifiers
RUSTSEC-2026-0399
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 3.0.0 up to 7.4.0 (exclusive) and 8.0.0 up to 8.2.0 (exclusive) of zstd-safe are affected. In these versions, the init_using_cdict and init_using_ddict functions, which are experimental and deprecated, did not tie the lifetime of the context to the dictionary, so a dictionary could be dropped while the context still referenced it, causing a use-after-free. The source gives few details on the attacker's position or what they can achieve. 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.