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Advisory record · GHSA-4684-h2q9-2vcp

ZipStreamReader::extract() and ZipArchive::extract() apply Unix permissions through symlinks without confining the target

CVSS 9.1 CriticalCritical

Critical, because:

  • CVSS score 9.1: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 10 Oct 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
zipcrates.io>=0.0.0-0, <9.0.09.0.0
Identifiers
GHSA-4684-h2q9-2vcp · RUSTSEC-2026-0369
Published
10 Oct 2026
Updated
16 Oct 2026

Machine-written summary

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

The zip crate (versions before 9.0.0) has a flaw in ZipStreamReader::extract() and ZipArchive::extract(), which apply Unix permissions through extracted symlinks without confining the symlink target to the destination directory. The source gives few details on the exact conditions or what an attacker can do. Upgrade to zip 9.0.0 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

ScoreRatingCVSSVectorSource
9.1 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H 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.