What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 4.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-10 · updated 2026-10-25
• Weakness: CWE-409

Description

Grav is a file-based Web platform. Prior to 2.0.0, an authenticated admin.super user can crash Grav or fill the disk by uploading a specially crafted ZIP archive through the Direct Install tool because Installer::unZip calls ZipArchive::extractTo without limits on uncompressed size, entry count, or directory depth. This issue is fixed in version 2.0.0.

Affected products

• getgrav grav: from 1.0.0 before 2.0.0; 2.0.0-beta1 — fixed in 2.0.0

How to fix

Upgrade to a fixed version: getgrav grav 2.0.0. Check the vendor advisory for mitigations.

References

• https://github.com/getgrav/grav/commit/23d6f2adf4ce11889c088ac8557c8314baeef781
• https://github.com/getgrav/grav/releases/tag/2.0.0
• https://github.com/getgrav/grav/security/advisories/GHSA-2vcx-h8p2-9pg9
• https://github.com/getgrav/grav/security/advisories/GHSA-2vcx-h8p2-9pg9

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