CVE-2025-26306 in libming
Summary
by MITRE • 02/20/2025
A memory leak has been identified in the readSizedString function in util/read.c of libming v0.4.8, which allows attackers to cause a denial of service via a crafted file.
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Analysis
by VulDB Data Team • 09/12/2025
The vulnerability CVE-2025-26306 represents a critical memory management flaw within the libming library version 0.4.8, specifically within the readSizedString function located in util/read.c. This memory leak occurs when processing crafted input files that exploit improper memory allocation and deallocation patterns during string parsing operations. The libming library is commonly used for parsing and manipulating macromedia flash files, making this vulnerability particularly concerning for applications that handle user-supplied flash content. The flaw manifests when the function fails to properly release allocated memory resources after processing sized string data structures, leading to progressive memory consumption over time.
The technical implementation of this vulnerability stems from inadequate memory management practices within the readSizedString function where allocated memory blocks are not consistently freed upon function exit or error conditions. This type of memory leak falls under CWE-401: Improper Release of Memory Before Removing Last Reference, which is classified as a fundamental memory management error that can be exploited to exhaust system resources. The vulnerability is particularly dangerous because it operates at the parsing layer of file processing, meaning that any application utilizing libming to process untrusted input files becomes susceptible to memory exhaustion attacks. Attackers can craft malicious flash files that trigger the memory leak with each processed string, causing progressive memory consumption until system resources are depleted.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as it can be leveraged in various attack scenarios that align with ATT&CK technique T1499.004: Endpoint Denial of Service. Applications that rely on libming for flash file processing become vulnerable to resource exhaustion attacks, potentially affecting web servers, content management systems, or any software that processes user-uploaded flash content. The vulnerability's exploitation is relatively straightforward since it requires only the creation of a specially crafted file that triggers the memory leak during normal parsing operations. This makes it particularly dangerous in environments where automated processing of user content occurs, as the memory leak can accumulate unnoticed until system performance degrades significantly or complete system failure occurs.
Mitigation strategies for CVE-2025-26306 should prioritize immediate patching of affected libming versions to address the memory leak in readSizedString function. Organizations should implement input validation and sanitization measures that limit file size and content complexity when processing flash files, reducing the potential impact of exploitation. Additionally, monitoring system memory usage and implementing resource limits on applications that utilize libming can help detect and prevent exploitation attempts. The vulnerability highlights the importance of proper memory management practices in C-based libraries and underscores the need for comprehensive code review processes that identify and address memory leak patterns. Security teams should also consider implementing intrusion detection systems that monitor for unusual memory consumption patterns that may indicate exploitation attempts, while maintaining updated threat intelligence feeds that track vulnerabilities in commonly used third-party libraries.