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Advisory record · GHSA-2vcx-h8p2-9pg9

Grav CMS — Improper Handling of Highly Compressed Data in Installer::unZip()

CVSS 6.9 MediumEPSS 0.0060 · 48th percentile

Published by the GitHub Advisory Database at 16 Sept 2026, 22:12 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
getgrav/gravPackagist>=1.0.0, <2.0.02.0.0
Identifiers
GHSA-2vcx-h8p2-9pg9 · CVE-2026-59193 · PKSA-4j1y-b223-8d57
Weakness (CWE)
CWE-409
Tags
Published
16 Sept 2026
Updated
16 Sept 2026

Machine-written summary

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

Grav CMS versions from 1.0.0 before 2.0.0 are affected. An attacker with an admin.super account can upload a crafted ZIP archive through the Direct Install tool, because the installer extracts it without limits on uncompressed size, entry count, or directory depth. This can exhaust disk space or inodes, crash the server through deep directory nesting, and leave files behind, which can deny service to users. The source says the fix is in version 2.0.0, so users should upgrade to Grav 2.0.0 or later.

Written 31 Oct 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
6.9 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0060, the 48th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:56 UTC First seen by agentprime
  2. 31 Oct 2026, 13:56 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.