CVE-2026-59942
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk32th percentile - higher than 32% of all known CVEs
Summary
In Dompdf versions 3.15 and prior, there is a Denial of Service (DoS) vulnerability via resource exhaustion. An attacker can submit a specially crafted HTML document with a single image of massive dimensions (e.g., 30,000x30,000 pixels), causing large memory and CPU allocation. This issue is fixed in version 3.16.
Risk Assessment
An unauthenticated attacker can cause a complete Denial of Service on the web server by sending a single HTTP request with crafted HTML.
Recommendation
Update Dompdf to version 3.16 or later.
Other vulnerabilities in Dompdf
See all- CVE-2026-59943Medium
In Dompdf versions 3.15 and prior, if an attacker can supply unrestricted content for rendering, they can utilize SVG rendering to leak filesystem information. Using an <image> element inside a data-URI embedded SVG, an attacker can attempt to embed other files. The difference in behavior when accessing existing vs. non-existing files enables information disclosure. This issue is fixed in version 3.16.
- CVE-2026-59941High
In Dompdf versions 3.15 and prior, a BMP image is accepted and a PDF-compatible PNG is generated based only on its declared header dimensions, without bounding width × height before conversion via GD. A small BMP (58 bytes) with a header declaring e.g. 6000×6000 causes full pixel canvas allocation, leading to significant memory amplification (up to 12x). This issue is fixed in version 3.16.
- CVE-2026-56722Medium
Dompdf versions 3.15 and earlier allow an attacker controlling HTML input to bypass restrictions by embedding a file path in an SVG image delivered via data: URI. During SVG processing, the second pass does not enforce the same protections as the first, leading to arbitrary image file reads from the server's filesystem.
- CVE-2026-55555High
Dompdf versions 3.15 and prior are vulnerable to a File Existence Oracle attack via manipulation of the CSS @font-face directive. An attacker can exploit the difference in behavior when referencing existing vs. non-existing local files (via file:// protocol) as an oracle to enumerate files on the server, even with CHROOT restrictions. This issue has been fixed in version 3.16.
- CVE-2026-55554High
In Dompdf versions 3.15 and prior, the validateLocalUri() method enforces CHROOT boundaries via a prefix check after path normalization. Because normalization strips the trailing directory separator, the check can be bypassed (e.g., /var/www also matches /var/www2). An attacker controlling part of the rendered HTML can read files outside the allowed directory. This issue has been fixed in version 3.16.
Original NVD description (English source)
Dompdf is an HTML to PDF converter for PHP. Versions 3.15 and prior are vulnerable to a Denial of Service (DoS) attack via resource exhaustion. An attacker can crash the PHP process by providing a specially crafted HTML document containing a single image with massive dimensions (e.g., 30,000x30,000 pixels). While Dompdf implements internal checks to validate image dimensions, these can be bypassed by using a high-entropy image (such as random noise) encoded in Base64 and wrapped in specific CSS containers. The vulnerability exists because the dimension validation happens early, but the resource allocation for calculating the object's bounding box and internal buffers during the rendering phase does not strictly limit the cumulative CPU time or memory usage for a single object that has passed the initial check. An unauthenticated remote attacker can cause a complete Denial of Service on the web server by submitting a crafted HTML string. This affects any application that allows users to provide HTML content or URLs that are subsequently converted to PDF using Dompdf. This issue has been fixed in version 3.16.