Vulnerability · Published Jul 10, 2026 · Assigned by GitHub_M

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

Medium 6.9

In plain English

A medium-severity security flaw in grav from getgrav. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.6%top 51.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	getgrav/grav	2.0.0	GHSA-2vcx-h8p2-9pg9

Affected products (as reported)

Vendor	Product	Versions
getgrav	grav	>= 1.0.0, < 2.0.0

Weakness: CWE-409 · Vector: 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

References

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