What is CVE-2026-59943?

Dompdf is an HTML to PDF converter for PHP. In versions 3.15 and prior, if a malicious actor can supply unrestricted content for rendering by Dompdf they can utilize the SVG rendering functionality to leak filesystem information when rendering PDF files using image references within a data-URI encoded SVG document. Using an element inside a data-URI embedded SVG, an attacker can attempt to embed other files via the href or xlink:href attributes. When processing a file that does not exist (e.g. file:///DOESNOTEXIST), dompdf behaves differently than it does when accessing a file or directory that actually exists on the filesystem. This issue has been fixed in version 3.16.

How severe is CVE-2026-59943?

CVE-2026-59943 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-59943 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-59943?

CVE-2026-59943 affects Dompdf Project Dompdf. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-59943?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-59943 published?

CVE-2026-59943 was published on 2026-07-28 and last updated on 2026-08-04.

CVE-2026-59943

CVE-2026-59943 is a medium-severity vulnerability in Dompdf Project Dompdf with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-209.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.3
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-209
Affected product: Dompdf Project Dompdf
Published: 2026-07-28
Last modified: 2026-08-04

Description

Dompdf is an HTML to PDF converter for PHP. In versions 3.15 and prior, if a malicious actor can supply unrestricted content for rendering by Dompdf they can utilize the SVG rendering functionality to leak filesystem information when rendering PDF files using image references within a data-URI encoded SVG document. Using an <image> element inside a data-URI embedded SVG, an attacker can attempt to embed other files via the href or xlink:href attributes. When processing a file that does not exist (e.g. file:///DOESNOTEXIST), dompdf behaves differently than it does when accessing a file or directory that actually exists on the filesystem. This issue has been fixed in version 3.16.

Frequently asked questions

What is CVE-2026-59943?: Dompdf is an HTML to PDF converter for PHP. In versions 3.15 and prior, if a malicious actor can supply unrestricted content for rendering by Dompdf they can utilize the SVG rendering functionality to leak filesystem information when rendering PDF files using image references within a data-URI encoded SVG document. Using an <image> element inside a data-URI embedded SVG, an attacker can attempt to embed other files via the href or xlink:href attributes. When processing a file that does not exist (e.g. file:///DOESNOTEXIST), dompdf behaves differently than it does when accessing a file or directory that actually exists on the filesystem. This issue has been fixed in version 3.16.
How severe is CVE-2026-59943?: CVE-2026-59943 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-59943 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-59943?: CVE-2026-59943 affects Dompdf Project Dompdf. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-59943?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-59943 published?: CVE-2026-59943 was published on 2026-07-28 and last updated on 2026-08-04.

References

Affected products (1)

cpe:2.3:a:dompdf_project:dompdf:*:*:*:*:*:*:*:*

More vulnerabilities in Dompdf Project Dompdf

CVE-2023-24813 — Critical (CVSS 10.0): Dompdf is an HTML to PDF converter written in php. Due to the difference in the attribute parser of Dompdf and…
CVE-2023-23924 — Critical (CVSS 10.0): Dompdf is an HTML to PDF converter. The URI validation on dompdf 2.0.1 can be bypassed on SVG parsing by passing…
CVE-2021-3902 — Critical (CVSS 9.8): An improper restriction of external entities (XXE) vulnerability in dompdf/dompdf's SVG parser allows for Server-Side…
CVE-2021-3838 — Critical (CVSS 9.8): DomPDF before version 2.0.0 is vulnerable to PHAR deserialization due to a lack of checking on the protocol before…
CVE-2022-28368 — Critical (CVSS 9.8): Dompdf 1.2.1 allows remote code execution via a .php file in the src:url field of an @font-face Cascading Style Sheets…
CVE-2014-5013 — High (CVSS 8.8): DOMPDF before 0.6.2 allows remote code execution, a related issue to CVE-2014-2383.

All CVEs affecting Dompdf Project Dompdf →

Other CWE-209 (Generation of Error Message Containing Sensitive Information) vulnerabilities

CVE-2025-62168 — Critical (CVSS 10.0): Squid is a caching proxy for the Web. In Squid versions prior to 7.2, a failure to redact HTTP authentication…
CVE-2025-68110 — Critical (CVSS 9.9): ChurchCRM is an open-source church management system. Versions prior to 6.5.3 may disclose database information in an…
CVE-2025-46658 — Critical (CVSS 9.8): An issue was discovered in ExonautWeb in 4C Strategies Exonaut 21.6. There are verbose error messages.
CVE-2024-28285 — Critical (CVSS 9.8): A Fault Injection vulnerability in the SymmetricDecrypt function in cryptopp/elgamal.h of Cryptopp Crypto++ 8.9, allows…
CVE-2023-40767 — Critical (CVSS 9.8): User enumeration is found in in PHPJabbers Make an Offer Widget v1.0. This issue occurs during password recovery, where…
CVE-2023-40766 — Critical (CVSS 9.8): User enumeration is found in in PHPJabbers Ticket Support Script v3.2. This issue occurs during password recovery,…

Browse all CWE-209 (Generation of Error Message Containing Sensitive Information) vulnerabilities →