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

Quick assessment

Affected
getgrav grav
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

getgrav Grav是getgrav个人开发者开源的一套可扩展的内容管理系统。 getgrav Grav 1.7.53之前版本和2.0.0-rc.8之前版本存在资源管理错误漏洞，该漏洞源于通过URL查询图像操作（如Grav::fallbackUrl中的forceResize）请求超大尺寸图像衍生时，未对维度或像素上限进行限制，可能导致未经身份验证的访问者耗尽服务器内存和CPU。

AI Predicted 7.5 Difficulty: Easy EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
getgrav grav >= 2.0.0-beta.1, < 2.0.0-rc.8 affected
< 1.7.53 affected
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I. Basic Information for CVE-2026-53653

Vulnerability Information
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Vulnerability Title
Grav: Unauthenticated denial of service via unbounded image derivative dimensions
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
getgrav Grav 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
getgrav Grav是getgrav个人开发者开源的一套可扩展的内容管理系统。 getgrav Grav 1.7.53之前版本和2.0.0-rc.8之前版本存在资源管理错误漏洞，该漏洞源于通过URL查询图像操作（如Grav::fallbackUrl中的forceResize）请求超大尺寸图像衍生时，未对维度或像素上限进行限制，可能导致未经身份验证的访问者耗尽服务器内存和CPU。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
getgrav grav >= 2.0.0-beta.1, < 2.0.0-rc.8 -

II. Public POCs for CVE-2026-53653

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III. Intelligence Information for CVE-2026-53653

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Patches & Fixes for CVE-2026-53653 (2)

Vendor Advisories for CVE-2026-53653 (1)

Vendor Pages for CVE-2026-53653 (1)

Same Patch Batch · getgrav · 2026-07-10 · 10 CVEs total

CVE-2026-55885 6.8 MEDIUM Grav: Admin Backup Zip File Exposes Account Credentials and Configuration Secrets
CVE-2026-61450 6.5 MEDIUM Grav before 2.0.2 Config Exfiltration via offsetGet Filter
CVE-2026-61455 6.5 MEDIUM Grav before 2.0.1 Decompression Bomb via ZipArchiver
CVE-2026-55890 4.8 MEDIUM Grav: Stored CSS injection via Markdown image ?style=… reaches MediaObjectTrait::style()
CVE-2026-61456 4.6 MEDIUM Grav before 1.0.3 Stored XSS via SVG Upload API
CVE-2026-58493 grav-plugin-database: DSN Parameter Injection via Unsanitized Configuration Values in Conn
CVE-2026-58492 grav-plugin-database: SQL Injection in PDO::tableExists() due to Unsanitized Table Name In
CVE-2026-59193 Grav CMS — Improper Handling of Highly Compressed Data in Installer::unZip()
CVE-2026-59190 Grav Admin Plugin — IDOR Privilege Escalation via saveUser()

IV. Related Vulnerabilities

Same product: grav
Same vendor: getgrav
Same weakness: CWE-770

V. Comments for CVE-2026-53653

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