CVE-2026-61690: Grav: Decompression Bomb via ZipArchiver - Missing Extraction Limits

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-19 · updated 2026-09-09
Weakness: CWE-409

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.

Affected products

getgrav grav: before 2.0.1

References

https://github.com/getgrav/grav/commit/1c1003cfcab5344203d6fde1aaa1f9a4ee3413ff
https://github.com/getgrav/grav/releases/tag/2.0.1
https://github.com/getgrav/grav/security/advisories/GHSA-928x-9mpw-8h56
https://github.com/getgrav/grav/security/advisories/GHSA-928x-9mpw-8h56

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