CVE-2026-59941
Dompdf: Uncontrolled resource consumption based on declared BMP dimensions
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.
INFO
Published Date :
July 28, 2026, 9:17 p.m.
Last Modified :
Aug. 4, 2026, 4:34 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update Dompdf to version 3.16 or later.
- Remove or sanitize uploaded BMP files.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-59941.
| URL | Resource |
|---|---|
| https://github.com/dompdf/dompdf/commit/7c65e7bbeccf146b2409740405af73949ad129d0 | Patch |
| https://github.com/dompdf/dompdf/releases/tag/v3.1.6 | Release Notes |
| https://github.com/dompdf/dompdf/security/advisories/GHSA-8hg6-c449-896m | Exploit Vendor Advisory |
| https://github.com/dompdf/dompdf/security/advisories/GHSA-8hg6-c449-896m | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-59941 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-59941
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-59941 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-59941 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 04, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:dompdf_project:dompdf:*:*:*:*:*:*:*:* versions up to (excluding) 3.1.6 Added Reference Type GitHub, Inc.: https://github.com/dompdf/dompdf/commit/7c65e7bbeccf146b2409740405af73949ad129d0 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/dompdf/dompdf/releases/tag/v3.1.6 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/dompdf/dompdf/security/advisories/GHSA-8hg6-c449-896m Types: Exploit, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/dompdf/dompdf/security/advisories/GHSA-8hg6-c449-896m Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 29, 2026
Action Type Old Value New Value Added Reference https://github.com/dompdf/dompdf/security/advisories/GHSA-8hg6-c449-896m Added SSVC {'id': 'CVE-2026-59941', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-29T12:41:13.459265Z'} -
New CVE Received by [email protected]
Jul. 28, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'dompdf', 'product': 'dompdf', 'versions': [{'status': 'affected', 'version': '< 3.1.6'}]}] Added 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-400 Added Reference https://github.com/dompdf/dompdf/commit/7c65e7bbeccf146b2409740405af73949ad129d0 Added Reference https://github.com/dompdf/dompdf/releases/tag/v3.1.6 Added Reference https://github.com/dompdf/dompdf/security/advisories/GHSA-8hg6-c449-896m