high8.7
CVE-2026-53653
Grav: Unauthenticated denial of service via unbounded image derivative dimensions
Impact
Grav is a file-based Web platform. Prior to 1.7.53 and 2.0.0-rc.8, Grav allows an unauthenticated visitor to exhaust server memory and CPU by requesting image derivatives with oversized dimensions through URL query image actions such as forceResize in Grav::fallbackUrl, which passes request parameters to ImageMedium magic actions without a dimension or pixel ceiling. This issue is fixed in versions 1.7.53 and 2.0.0-rc.8.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | getgrav/grav | >= 2.0.0-beta.1, < 2.0.0-rc.8 | 2.0.0-rc.8 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-4x9g-vw65-vvf9
- https://github.com/getgrav/grav/security/advisories/GHSA-4x9g-vw65-vvf9
- https://nvd.nist.gov/vuln/detail/CVE-2026-53653
- https://github.com/getgrav/grav/commit/d9f9f0369a07ae5c96cde700c7949e1237b29cf6
- https://github.com/getgrav/grav/commit/f4c0f42eea755cedad6f626b342c88d4cba72174
- https://github.com/getgrav/grav/releases/tag/1.7.53
- https://github.com/getgrav/grav/releases/tag/2.0.0-rc.8