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Grav CMS CVE-2026-61690

| EUVDEUVD-2026-62534 MEDIUM
Improper Handling of Highly Compressed Data (Data Amplification) (CWE-409)
2026-08-19 GitHub_M GHSA-928x-9mpw-8h56
PHP Information Disclosure Grav
6.5
CVSS 3.1 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
6.5 MEDIUM

Network-reachable via web upload requiring a low-privilege authenticated account; impact is pure availability via disk exhaustion with no confidentiality or integrity effect.

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

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Patch available
Aug 19, 2026 - 16:17 EUVD
Source Code Evidence Fetched
Aug 19, 2026 - 16:08 vuln.today
Analysis Generated
Aug 19, 2026 - 16:08 vuln.today

DescriptionCVE.org

Grav is a file-based Web platform. Prior to 2.0.1, Grav ZipArchiver::extract() in system/src/Grav/Common/Filesystem/ZipArchiver.php passes archives to ZipArchive::extractTo() without enforcing the system.gpm.archive uncompressed-size, file-count, or nesting-depth limits. Code using Archiver::create('zip') to extract an attacker-controlled archive can exhaust disk space or inodes and make the site unavailable. This issue is fixed in version 2.0.1.

AnalysisAI

Disk-exhaustion denial of service in Grav CMS prior to 2.0.1 is reachable through the ZipArchiver::extract() code path, which passes attacker-controlled ZIP archives to PHP's ZipArchive::extractTo() without enforcing the platform's configured limits on uncompressed size, file count, or directory nesting depth. An authenticated attacker with plugin or theme upload access can submit a crafted decompression bomb to exhaust disk space or inodes, rendering the site unavailable. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated Grav session with sufficient privileges to upload or install archives through any code path invoking Archiver::create('zip') - specifically the ZipArchiver::extract() path triggered during plugin, theme, or package installation via the admin panel or GPM. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 6.5 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) accurately represents the threat profile: network-accessible, low complexity, requiring only a low-privilege authenticated account, with pure availability impact and no confidentiality or integrity exposure. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to Grav 2.0.1, released June 22, 2026, which introduces pre-extraction limit enforcement in ZipArchiver::extract() matching the caps already applied by GPM\Installer::unZip(). … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-61690 vulnerability details – vuln.today
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