CVE-2026-59193: Grav CMS — Improper Handling of Highly Compressed Data in Installer::unZip()

September 16, 2026

An authenticated admin.super user can crash Grav or fill the disk by uploading a specially crafted ZIP archive through the Direct Install tool. The method Installer::unZip() calls ZipArchive::extractTo() without any limit on uncompressed size, entry count, or directory depth, enabling Zip Bomb (CWE-409), stack overflow (CWE-674), and disk/inode exhaustion.

References

github.com/advisories/GHSA-2vcx-h8p2-9pg9
github.com/getgrav/grav/commit/23d6f2adf4ce11889c088ac8557c8314baeef781
github.com/getgrav/grav/releases/tag/2.0.0
github.com/getgrav/grav/security/advisories/GHSA-2vcx-h8p2-9pg9
nvd.nist.gov/vuln/detail/CVE-2026-59193

Code Behaviors & Features

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