PatchSiren cyber security CVE debrief
CVE-2026-53653 getgrav CVE debrief
CVE-2026-53653 is a high-severity vulnerability in Grav, a file-based web platform. An unauthenticated visitor can exhaust server memory and CPU by requesting image derivatives with oversized dimensions through URL query image actions. This issue is fixed in Grav versions 1.7.53 and 2.0.0-rc.8. The vulnerability class is related to image derivative generation, and the likely operational impact is server resource exhaustion. The source confidence is limited, and defenders should review the context and verify the affected scope.
- Vendor
- getgrav
- Product
- grav
- CVSS
- HIGH 8.7
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-07-10
- Original CVE updated
- 2026-07-10
- Advisory published
- 2026-07-10
- Advisory updated
- 2026-07-10
Who should care
Administrators and users of Grav versions prior to 1.7.53 and 2.0.0-rc.8 should apply the patches to prevent server resource exhaustion. Operators, platform administrators, vulnerability management teams, and security teams should review the vulnerability and apply patches or mitigations as needed.
Technical summary
The vulnerability exists in Grav's image derivative generation. An unauthenticated visitor can exploit this by requesting image derivatives with oversized dimensions, leading to server memory and CPU exhaustion. The issue is caused by the lack of dimension or pixel ceiling in Grav::fallbackUrl, which passes request parameters to ImageMedium magic actions. The affected product context is Grav versions prior to 1.7.53 and 2.0.0-rc.8.
Defensive priority
High priority should be given to applying patches for Grav versions prior to 1.7.53 and 2.0.0-rc.8 to prevent potential server resource exhaustion.
Recommended defensive actions
- Apply patches for Grav versions prior to 1.7.53 and 2.0.0-rc.8
- Restrict access to image derivative generation
- Monitor server resources for unusual activity
- Review compensating controls for exposed systems while remediation is scheduled and verified
- Check relevant monitoring, detection, and logs for exposed assets that need extra review
- Track exceptions, retest remediated assets, and close the item only after evidence is documented
- Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
Evidence notes
The CVE record was published on 2026-07-10T17:16:57.857Z and has not been modified since then. The NVD entry is currently Deferred. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the vendor. The vulnerability exists in Grav's image derivative generation, allowing an unauthenticated visitor to exhaust server memory and CPU by requesting image derivatives with oversized dimensions.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-10T17:16:57.857Z and has not been modified since then. The NVD entry is currently Deferred.