Grav: Decompression Bomb via ZipArchiver - Missing Extraction Limits
Priority HIGH 68CWE-409Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0053 45th percentileScored 2026-11-07
Fix Fixed grav (getgrav): 2.0.1getgrav/grav (Packagist): 2.0.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| getgrav | grav | before 2.0.1 | 2.0.1 | Patch available | CNA |
| — | getgrav/grav (Packagist) | before 2.0.1 | 2.0.1 | Patch available | GHSA-928x-9mpw-8h56 |
- grav Vendorgetgrav Affected before 2.0.1 Fixed in 2.0.1 Patch available CNA
- getgrav/grav (Packagist) Vendor— Affected before 2.0.1 Fixed in 2.0.1 Patch available GHSA-928x-9mpw-8h56
Remediation
- Fix · CNA grav (getgrav) Fixed in 2.0.1
- Fix · GHSA-928x-9mpw-8h56 getgrav/grav (Packagist) Fixed in 2.0.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-61690
- 2026-10-03 Alias added: GHSA-928x-9mpw-8h56
References
More getgrav vulnerabilities
- TI-2026-30893 Grav: Privilege Escalation via Missing Server-Side Validation of groups/access CVSS 3.1CRITICAL 9.4
- 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-2021-04523 Unauthenticated Arbitrary YAML Write/Update leads to Code Execution CVSS 3.1CRITICAL 9.8
- TI-2026-50940 Grav CMS before 2.0.16 Origin Validation Bypass via Referer CVSS 4.0CRITICAL 9.3
- TI-2026-46446 Grav before 2.0.7 Remote Code Execution via Blueprint dynamicData CVSS 4.0CRITICAL 9.3
- TI-2021-22428 GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2) CVSS 4.0CRITICAL 9.3
Sources
- CVE-2026-61690 · CVE Program
- CVE-2026-61690 · NVD
- FIRST EPSS
- GHSA-928x-9mpw-8h56 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences