CVE-2026-19695 in Gammu
Summary
by MITRE • 08/13/2026
Gammu DCT3 trace file parser crash in 4.6.0 to 4.6.7 allows denial of service
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Analysis
by VulDB Data Team • 08/13/2026
The vulnerability in Gammu DCT3 trace file parser represents a critical denial of service condition that affects versions 4.6.0 through 4.6.7 of the software. This issue manifests when the application processes specially crafted DCT3 trace files, leading to an unexpected crash and subsequent system unavailability. The flaw exists within the parsing logic that handles these specific file formats, where improper input validation allows malicious or malformed data to trigger memory corruption or execution flow disruption.
This vulnerability operates at the input processing layer of the Gammu application, specifically targeting the DCT3 trace file handling mechanism. The technical root cause stems from insufficient boundary checking and validation routines within the parser implementation. When encountering certain byte sequences or structural anomalies in the trace files, the parser fails to properly handle the data flow, resulting in stack corruption, memory access violations, or arbitrary code execution paths that ultimately lead to process termination. The flaw aligns with CWE-121 Stack-based Buffer Overflow and CWE-125 Out-of-bounds Read categories, demonstrating how inadequate input sanitization can create exploitable conditions.
The operational impact of this vulnerability extends beyond simple service disruption as it can be leveraged by attackers to systematically deny service to legitimate users. An attacker who can convince a target system to process a malicious DCT3 trace file can effectively crash the Gammu application, potentially causing extended downtime for mobile device communication services. This becomes particularly concerning in environments where automated processes rely on Gammu for device management, as the denial of service could cascade into broader operational failures. The vulnerability affects systems that process or receive DCT3 trace files from external sources, including mobile network operators and device management platforms.
Mitigation strategies should focus on input validation and robust error handling within the parser component. Immediate remediation involves updating to patched versions of Gammu where the parsing logic has been hardened against malformed inputs. Organizations should implement strict file validation procedures before processing any DCT3 trace files, particularly those received from untrusted sources. The implementation of defensive programming practices including bounds checking, memory allocation verification, and proper exception handling can significantly reduce the attack surface. Additionally, deployment of network segmentation and access controls can limit exposure by restricting which systems can process these specific file types. This vulnerability demonstrates the importance of secure coding practices and input validation as outlined in the software security principles of the MITRE ATT&CK framework under the technique of T1499 - Endpoint Denial of Service.