CVE-2026-53653 Grav: Unauthenticated denial of service via unbounded image derivative dimensions
Unauthenticated attackers can exhaust server resources by requesting image derivatives with oversized dimensions, causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-53653?
CVE-2026-53653 is a high-severity denial of service vulnerability in getgrav grav, published on 10 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-770
Which versions are affected by CVE-2026-53653?
4 open source packages ship an affected version, including getgrav/grav.
| Package | Affected | Fixed in |
|---|---|---|
getgrav/grav Packagist | All versions | 1.7.53 |
getgrav/grav Packagist | All versions | 1.7.53 |
getgrav/grav Packagist | From 2.0.0-beta.1 | 2.0.0-rc.8 |
getgrav/grav Packagist | From 2.0.0-beta.1 | 2.0.0-rc.8 |
How do I fix CVE-2026-53653?
Upgrade getgrav/grav to a fixed version for your release line: 1.7.53 or 2.0.0-rc.8.
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-2026-53653 being exploited?
There is no known exploitation of CVE-2026-53653 in the wild and no public exploit code.
Sources
Also known as GHSA-4x9g-vw65-vvf9.