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TI-2026-42340 Aliases CVE-2026-59193GHSA-2vcx-h8p2-9pg9

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

Priority MEDIUM 64CWE-409Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.006 48th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed grav (getgrav): 2.0.0getgrav/grav (Packagist): 2.0.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
getgravgrav1.0.0 to before 2.0.02.0.0Patch availableCNA
—getgrav/grav (Packagist)1.0.0 to before 2.0.02.0.0Patch availableGHSA-2vcx-h8p2-9pg9
  • grav Vendorgetgrav Affected 1.0.0 to before 2.0.0 Fixed in 2.0.0 Patch available CNA
  • getgrav/grav (Packagist) Vendor— Affected 1.0.0 to before 2.0.0 Fixed in 2.0.0 Patch available GHSA-2vcx-h8p2-9pg9

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:getgrav:grav:*:*:*:*:*:*:*:*1.0.0 to before 2.0.0Vulnerablegetgrav
cpe:2.3:a:getgrav:grav:2.0.0:beta1:*:*:*:*:*:*2.0.0 beta1Vulnerablegetgrav
  • cpe:2.3:a:getgrav:grav:*:*:*:*:*:*:*:* Versions 1.0.0 to before 2.0.0 Vulnerable ·getgrav
  • cpe:2.3:a:getgrav:grav:2.0.0:beta1:*:*:*:*:*:* Versions 2.0.0 beta1 Vulnerable ·getgrav

Remediation

  • Fix · CNA grav (getgrav) Fixed in 2.0.0
  • Fix · GHSA-2vcx-h8p2-9pg9 getgrav/grav (Packagist) Fixed in 2.0.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-59193
  2. 2026-10-03 Alias added: GHSA-2vcx-h8p2-9pg9

References

Exploit 1

Patch 1

Advisory 1

Other 2

  • TI-2025-28971 Cross Site Scripting vulnerability in grav v.1.7.48 and before allows an attacker to… CVSS 3.1CRITICAL 9.8
  • TI-2021-22428 GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2) CVSS 4.0CRITICAL 9.3
  • TI-2025-41064 In grav <1.7.49.5, a SSRF (Server-Side Request Forgery) vector may be triggered via Twig… CVSS 3.1CRITICAL 9.1
  • TI-2026-30888 Grav: Unauthenticated Path Traversal & Arbitrary File Write in FormFlash component. CVSS 4.0HIGH 8.8
  • TI-2025-40773 Security Sandbox Bypass with SSTI (Server Side Template Injection) in the Grav CMS CVSS 3.1HIGH 8.8
  • TI-2025-40768 Grav is vulnerable to RCE via SSTI through Twig Sandbox Bypass CVSS 4.0HIGH 8.7
See all 56 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences