CVE-2026-61455: Grav before 2.0.1 Decompression Bomb via ZipArchiver

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-10 · updated 2026-10-25
Weakness: CWE-409

Description

Grav before 2.0.1 contains a decompression bomb vulnerability in ZipArchiver::extract() that lacks limits on uncompressed size, file count, and nesting depth. Attackers can supply a crafted ZIP archive that expands to fill available disk space, causing denial of service by exhausting storage resources.

Affected products

getgrav grav: before 2.0.1 — fixed in 2.0.1

How to fix

Upgrade to a fixed version: getgrav grav 2.0.1. Check the vendor advisory for mitigations.

References

https://github.com/getgrav/grav/security/advisories/GHSA-928x-9mpw-8h56
https://www.vulncheck.com/advisories/grav-before-decompression-bomb-via-ziparchiver
https://github.com/getgrav/grav/security/advisories/GHSA-928x-9mpw-8h56

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