CVE-2026-44756 in Extended Passport Processing
Summary
by MITRE • 09/08/2026
A memory safety vulnerability exists in the Extended Passport Protocol (EPP) processing library. Under specific conditions, an unauthenticated attacker could exploit a crafted network request containing a malformed EPP header, potentially resulting in undefined behavior and abnormal program termination. Successful exploitation may have a high impact on the confidentiality, integrity, and availability of the application.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability identified within the Extended Passport Protocol processing library represents a critical memory safety flaw that stems from insufficient validation of input data during the parsing of EPP headers. The Extended Passport Protocol is often utilized in identity management systems to facilitate secure authentication and authorization exchanges, making its underlying libraries foundational to system integrity. When an unauthenticated attacker submits a specifically crafted network request containing a malformed or maliciously constructed EPP header, the processing library fails to properly bounds-check memory operations associated with parsing these headers. This lack of rigorous input sanitization allows for conditions where the application attempts to access memory regions outside its allocated boundaries, leading directly to undefined behavior as described in common vulnerability classifications such as CWE-125 Out-of-bounds Read or potentially CWE-787 Out-of-bounds Write depending on the specific nature of the malformed header and how it interacts with internal buffers.
The operational impact of this flaw is severe due to its potential for remote code execution or denial of service without prior authentication. Because the vulnerability can be triggered by an unauthenticated actor, the attack surface is significantly expanded compared to vulnerabilities requiring valid credentials. The immediate consequence of exploiting this memory safety issue is abnormal program termination, which directly impacts the availability component of the CIA triad. However, given that many EPP implementations run with elevated privileges or handle sensitive identity data, successful exploitation could extend beyond simple crashes. An attacker might leverage the undefined behavior to execute arbitrary code on the host system, thereby compromising confidentiality and integrity by exfiltrating passport credentials, session tokens, or other sensitive authentication artifacts stored in memory during processing.
From a threat modeling perspective, this vulnerability aligns with techniques observed in advanced persistent threats where attackers target identity infrastructure components to establish footholds within enterprise networks. The exploitation vector corresponds to ATT&CK technique T1190 Exploit Public-Facing Application, as the flaw resides in a network-facing service component that processes external inputs. Furthermore, the memory corruption aspect maps closely to CWE-416 Use After Free or CWE-78 Buffer Overflow if the malformed header causes heap corruption during dynamic allocation phases within the EPP parser. The high impact rating is justified by the fact that compromising an identity protocol library often serves as a pivot point for broader network compromise, allowing attackers to impersonate legitimate users or bypass access controls entirely.
Mitigation strategies must prioritize immediate patching of the affected processing library with vendor-provided updates that address these memory safety issues through rigorous input validation and bounds checking. In environments where patching is not immediately feasible, network-level mitigations such as strict firewall rules restricting access to EPP endpoints only from trusted IP ranges can reduce exposure. Additionally, implementing Web Application Firewalls configured to detect anomalous header structures or oversized payloads may help block exploitation attempts before they reach the vulnerable application logic. Long-term remediation should involve adopting memory-safe programming languages for new development and integrating static analysis tools into the CI/CD pipeline to catch similar buffer handling errors early in the software lifecycle, ensuring that future iterations of identity management protocols are resilient against such low-level memory corruption attacks.