CVE-2025-67432 identifies a stack overflow vulnerability in the ZBarcode_Encode function of the Monkeybread Software MBS DynaPDF Plugin version 21.3.1.1. The vulnerability arises when the function processes specially crafted input data that exceeds the expected buffer size, leading to a stack overflow condition. This overflow can cause the application to crash, resulting in a Denial of Service (DoS) condition. The vulnerability does not currently have a CVSS score assigned, and no public exploits have been reported. The affected component, the DynaPDF Plugin, is used for PDF generation and barcode encoding within applications that integrate this plugin. The flaw specifically impacts the availability of services relying on this plugin, as the overflow causes application instability or crashes. There is no indication that the vulnerability allows for arbitrary code execution or privilege escalation. Exploitation does not require authentication or user interaction, meaning an attacker could trigger the DoS remotely if the vulnerable function is exposed to untrusted input. The vulnerability was reserved in December 2025 and published in February 2026, indicating recent discovery. No patches or mitigations have been officially released yet, highlighting the need for proactive defensive measures.

For European organizations, the primary impact of CVE-2025-67432 is service disruption due to Denial of Service conditions in applications using the MBS DynaPDF Plugin for barcode encoding. This can affect document processing workflows, automated PDF generation, and any business processes relying on barcode data encoding within PDFs. Industries such as logistics, manufacturing, retail, and government agencies that generate or process barcoded documents could experience operational interruptions. While the vulnerability does not appear to compromise confidentiality or integrity, the availability impact could lead to downtime, delayed processing, and potential financial losses. The lack of known exploits reduces immediate risk, but the ease of triggering a stack overflow with crafted input means attackers could leverage this vulnerability in targeted attacks or automated scanning campaigns. European organizations with integrated document management systems or custom software embedding this plugin are at risk. The impact is more significant for organizations lacking robust input validation or sandboxing around PDF generation components.

Since no official patch is currently available, European organizations should implement immediate mitigations to reduce risk. First, apply strict input validation and sanitization on all data passed to the barcode encoding functions to prevent malformed or oversized inputs. Employ application-level sandboxing or process isolation for components using the MBS DynaPDF Plugin to contain potential crashes and prevent cascading failures. Monitor application logs and crash reports for signs of stack overflow or abnormal termination related to barcode encoding. Where feasible, restrict access to services exposing the vulnerable plugin to trusted networks or authenticated users to limit exposure. Engage with Monkeybread Software for updates and apply patches promptly once released. Consider alternative PDF generation or barcode encoding libraries with a strong security track record if patching is delayed. Conduct security testing and fuzzing on the barcode encoding functionality to identify and remediate similar input handling issues proactively. Maintain incident response readiness to quickly address potential DoS incidents stemming from this vulnerability.