CVE-2026-61690 Grav: Decompression Bomb via ZipArchiver - Missing Extraction Limits
Attackers can cause denial of service in Grav by uploading malicious archives that bypass extraction limits, exhausting disk resources.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-61690?
CVE-2026-61690 is a medium-severity denial of service vulnerability in getgrav grav, published on 19 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-409
Which versions are affected by CVE-2026-61690?
How do I fix CVE-2026-61690?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-61690 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-61690 exists.