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CVE-2026-59941— Dompdf: Uncontrolled resource consumption based on declared BMP dimensions

Quick assessment

Affected
dompdf dompdf
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.

dompdf是dompdf团队开源的一个 HTML 到 PDF 的转换器。 dompdf 3.16之前版本存在资源管理错误漏洞，该漏洞源于接受BMP图像时仅依据声明的头部尺寸生成PNG，未限制宽高，导致通过GD分配完整像素画布，造成内存放大，可能导致拒绝服务。

CVSS 6.3 · Medium EPSS 0.64% · P49

Affected Version Matrix 1

VendorProduct Version RangeStatus
dompdf dompdf < 3.1.6 affected
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I. Basic Information for CVE-2026-59941

Vulnerability Information
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Vulnerability Title
Dompdf: Uncontrolled resource consumption based on declared BMP dimensions
Source: CVE Program / CVE List V5
Vulnerability Description
Dompdf is an HTML to PDF converter for PHP. Versions 3.15 and prior accept a BMP image and generates a PDF-compatible PNG based only on its declared header dimensions and never bounds width × height before the image is converted through GD. A 58-byte BMP whose header declares e.g. 6000×6000 is accepted and later drives imagecreatetruecolor($width, $height) (and PHP's native BMP decoder) to allocate the full pixel canvas. A payload can fit in a single HTTP request: the BMP can be inlined as a data:image/bmp;base64,… URI inside attacker-controlled HTML, so no upload, no remote fetch, and no chroot-reachable file is required. I measured a 169-byte request driving a dompdf render to ~412 MB peak RSS and ~4.8 s of CPU/wall time, versus ~34 MB for an identically-sized benign request — roughly a 12× memory amplification per request, repeatable and unauthenticated. This issue has been fixed in version 3.16.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
dompdf 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
dompdf是dompdf团队开源的一个 HTML 到 PDF 的转换器。 dompdf 3.16之前版本存在资源管理错误漏洞，该漏洞源于接受BMP图像时仅依据声明的头部尺寸生成PNG，未限制宽高，导致通过GD分配完整像素画布，造成内存放大，可能导致拒绝服务。
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
dompdf dompdf < 3.1.6 -

II. Public POCs for CVE-2026-59941

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III. Intelligence Information for CVE-2026-59941

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Patches & Fixes for CVE-2026-59941 (1)

Vendor Advisories for CVE-2026-59941 (1)

Vendor Pages for CVE-2026-59941 (1)

Same Patch Batch · dompdf · 2026-07-28 · 6 CVEs total

CVE-2026-56722 6.3 MEDIUM Dompdf: Local file read due to improper file path validation in SVG images encoded as data
CVE-2026-59942 6.3 MEDIUM Dompdf: Denial of Service (DoS) via Resource Exhaustion using Oversized Image Bitmaps
CVE-2026-59943 6.3 MEDIUM Dompdf: Embedded SVG images can leak existence of files and directories within the filesys
CVE-2026-55554 2.3 LOW Dompdf: Chroot Validation Bypass
CVE-2026-55555 2.3 LOW Dompdf: File existence oracle via font-face stylesheet declaration

IV. Related Vulnerabilities

Same product: dompdf
Same vendor: dompdf
Same weakness: CWE-400

V. Comments for CVE-2026-59941

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