What’s Vulnerable › Vulnerabilities

CVE-2026-53653: Grav: Unauthenticated denial of service via unbounded image derivative dimensions

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% 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-770

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.

Affected products

• getgrav grav: from 2.0.0-beta.1, < 2.0.0-rc.8; before 1.7.53

References

• 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
• https://github.com/getgrav/grav/security/advisories/GHSA-4x9g-vw65-vvf9

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