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Advisory record · GHSA-m665-v7pm-7grj

zip: Critical Parser Differential & Security Control Bypass via Dual-Header Inconsistencies (Zip Cloaking) Leading to Arbitrary File Overwrite & RCE

CVSS 10.0 CriticalCriticalEPSS 0.0032 · 25th percentile

Critical, because:

  • CVSS score 10.0: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 28 Oct 2026, 21:09 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
zipcrates.io<9.0.59.0.5
Identifiers
GHSA-m665-v7pm-7grj · CVE-2026-115905
Weakness (CWE)
CWE-20 · CWE-436
Tags
Published
28 Oct 2026
Updated
28 Oct 2026

Machine-written summary

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

The zip crate (affected versions 9.0.4 and earlier, fixed in 9.0.5) reads filenames differently depending on the reader: ZipArchive uses the central directory header, while ZipStreamReader uses the local file header when extracting. An attacker who can supply a crafted archive can make a security gateway that inspects it with ZipArchive see a benign filename while a streaming extractor writes a different file, potentially overwriting existing files. The source gives little detail on exploitation conditions. Upgrade to zip 9.0.5 or later; no other workaround is listed.

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
10.0 Critical 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0032, the 25th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 26 Oct 2026, 16:24 UTC Confirmed by the CVE List
  2. 26 Oct 2026, 17:17 UTC Confirmed by NVD
  3. 31 Oct 2026, 14:24 UTC First seen by agentprime
  4. 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.