Input validation error in Dompdf - CVE-2026-55554
Published: July 20, 2026
Vulnerability identifier: #VU138599
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-55554
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: dompdf
Affected software:
Dompdf
Dompdf
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to improper input validation in the validateLocalUri() method when processing attacker-controlled document paths or resources. A remote attacker can supply crafted HTML containing local file references to disclose sensitive information.
Exploitation requires control over a portion of the rendered HTML.
How to mitigate CVE-2026-55554
Install security update from vendor's website.