CVE-2010-0409 in GMIME
Summary
by MITRE
Buffer overflow in the GMIME_UUENCODE_LEN macro in gmime/gmime-encodings.h in GMime before 2.4.15 allows context-dependent attackers to cause a denial of service (application crash) or possibly execute arbitrary code via input data for a uuencode operation.
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Analysis
by VulDB Data Team • 04/30/2026
The vulnerability identified as CVE-2010-0409 represents a critical buffer overflow condition within the GMime library's encoding handling mechanisms. This issue specifically affects the GMIME_UUENCODE_LEN macro located in the gmime-encodings.h header file, which is part of the GMime email message handling library used extensively in various email clients and server applications. The flaw exists in versions prior to 2.4.15, making it a significant concern for systems that rely on this library for processing email content, particularly when handling uuencoded data streams.
The technical implementation of this vulnerability stems from inadequate bounds checking within the GMIME_UUENCODE_LEN macro, which is responsible for calculating the required buffer space for uuencoded data operations. When processing maliciously crafted input data, the macro fails to properly validate the size of the input, leading to memory corruption that can manifest as either a controlled application crash or potentially arbitrary code execution. The vulnerability is context-dependent, meaning that an attacker must have the ability to influence the input data being processed by the GMime library, typically through email message content or file attachments that are subsequently decoded by applications using this library.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as the potential for arbitrary code execution makes it particularly dangerous for email server applications, desktop email clients, and any system that processes untrusted email content through the GMime library. Attackers could exploit this weakness by crafting specially formatted email messages containing malicious uuencoded data that, when processed by vulnerable applications, would trigger the buffer overflow condition. This could result in complete system compromise, data exfiltration, or further propagation within network environments where such applications are deployed. The vulnerability affects a wide range of email processing systems including mail servers, desktop email clients, and content filtering solutions that utilize GMime for handling encoded email content.
Mitigation strategies for CVE-2010-0409 primarily focus on immediate version upgrading to GMime 2.4.15 or later, which contains the necessary patches to address the buffer overflow condition. System administrators should prioritize patching affected applications that depend on GMime, particularly email servers and clients that process untrusted email content. Additional defensive measures include implementing strict input validation and sanitization for email content, deploying email security appliances that can detect and block malicious uuencoded content, and configuring applications to limit the size of processed email attachments. From a cybersecurity perspective, this vulnerability aligns with CWE-121, which addresses stack-based buffer overflow conditions, and represents a classic example of how encoding libraries can become attack vectors when proper input validation is not implemented. The ATT&CK framework categorizes this as a code injection technique, specifically related to buffer overflow vulnerabilities that can be exploited through crafted input data processing, emphasizing the importance of robust input validation and memory safety practices in application development and security hardening.