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Grav CMS CVE-2026-59193

| EUVDEUVD-2026-42951 MEDIUM
Improper Handling of Highly Compressed Data (Data Amplification) (CWE-409)
2026-07-10 GitHub_M
Denial Of Service Grav
6.9
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
6.9 MEDIUM
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
4.9 MEDIUM

Network-reachable upload endpoint but PR:H reflects mandatory admin.super authentication; purely availability impact with no scope change to other systems.

3.1 AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Jul 10, 2026 - 18:01 EUVD
Analysis Generated
Jul 10, 2026 - 17:35 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Disk exhaustion and crash vulnerability in Grav's Direct Install tool allows an authenticated admin.super user to upload a specially crafted ZIP archive that decompresses without bound, filling the server disk or crashing the process. Affecting all Grav releases prior to 2.0.0, the root cause is the Installer::unZip method invoking PHP's ZipArchive::extractTo with no enforced limits on uncompressed size, entry count, or directory depth - a classic zip bomb attack surface. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Obtain admin.super credentials
Delivery
Authenticate to Grav admin panel
Exploit
Navigate to Direct Install tool
Install
Upload crafted zip bomb archive
C2
Trigger unbound ZipArchive::extractTo
Execute
Exhaust disk or crash PHP process
Impact
Grav instance unavailable
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated session with the admin.super role in Grav - the highest privilege tier, not standard admin. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H) scores 6.9, accurately reflecting the trade-off between network accessibility and the high-privilege prerequisite. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has obtained admin.super credentials - through credential stuffing, phishing, or insider access - navigates to Grav's Direct Install tool and uploads a crafted ZIP archive containing deeply nested or highly repetitive entries that expand to many gigabytes upon extraction. ZipArchive::extractTo proceeds without limit, writing data until available disk space is consumed or the PHP process is killed, taking the Grav site offline. …
Remediation Upgrade to Grav 2.0.0, which introduces extraction limits in Installer::unZip to prevent zip bomb decompression. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-59193 vulnerability details – vuln.today
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