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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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-53653 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-53653

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-53653 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-53653

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.