CVE-2026-54079 in validation
Summary
by MITRE • 07/29/2026
veraPDF validation provides PDF/A and PDF/UA validation, feature reporting, and metadata repair. From 1.17.35 until 1.30.2 and 1.31.71, veraPDF-validation contains an XML External Entity (XXE) vulnerability in validation-model/src/main/java/org/verapdf/gf/model/impl/pd/GFPDAcroForm.java in the getdynamicRender() method, where a crafted PDF containing a malicious XFA stream can cause external entity expansion during PDF/UA-1 validation and allow local file disclosure or outbound server-side requests. This issue is fixed in versions 1.30.2 and 1.31.71.
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Analysis
by VulDB Data Team • 07/29/2026
The veraPDF validation library represents a critical component in digital document compliance testing, specifically designed to validate PDF/A and PDF/UA standards while providing feature reporting and metadata repair capabilities. This tool serves as an essential verification mechanism for organizations requiring strict adherence to PDF standards, particularly in archival and accessibility contexts where document integrity is paramount.
The vulnerability manifests within the validation-model module at the specific file path validation-model/src/main/java/org/verapdf/gf/model/impl/pd/GFPDAcroForm.java in the getdynamicRender() method. This represents a classic XML External Entity processing flaw that occurs during PDF/UA-1 validation procedures when processing XFA (XML Forms Architecture) streams within crafted malicious PDF files. The vulnerability stems from insufficient input sanitization and improper XML parsing mechanisms that fail to disable external entity resolution during document validation processes.
When exploited, this XXE vulnerability enables attackers to construct malicious PDF documents containing specially crafted XFA streams that trigger external entity expansion upon validation. The attack vector specifically targets the PDF/UA-1 validation workflow where the system attempts to render dynamic content from the XFA data structure. This flaw allows for local file disclosure attacks where sensitive system files can be accessed and exfiltrated, as well as outbound server-side requests that can be used for command and control communications or further reconnaissance activities.
The impact of this vulnerability extends beyond simple information disclosure, as it represents a potential pathway for attackers to escalate privileges within systems running veraPDF validation services. Organizations relying on automated PDF validation workflows become particularly vulnerable since the attack can be executed through standard document processing pipelines without requiring user interaction or specialized knowledge of the system internals. This makes the vulnerability particularly dangerous in enterprise environments where PDF validation is performed automatically on incoming documents.
The security implications align with CWE-611 (Improper Restriction of XML External Entity Reference) and map directly to ATT&CK techniques including T1059 (Command and Scripting Interpreter) and T1071.004 (Application Layer Protocol: DNS) for network exfiltration activities. The vulnerability demonstrates poor input validation practices in XML processing components that should have implemented proper security controls such as disabling external entity resolution, using secure XML parsers, or implementing strict input sanitization measures.
Mitigation strategies should focus on immediate remediation through version upgrades to 1.30.2 or 1.31.71 where the XXE vulnerability has been addressed. Organizations should also implement network segmentation and firewall rules to limit outbound connections from validation servers, particularly when processing untrusted PDF documents. Additional protective measures include implementing strict input validation for all document processing workflows, conducting regular security assessments of validation pipelines, and ensuring that automated document processing systems operate with minimal privileges to reduce potential impact if exploitation occurs. The fix demonstrates the importance of proper XML parsing security controls in document processing applications and serves as a reminder of the critical need for secure coding practices in validation and parsing components that handle untrusted input data streams.