CVE-2026-3082: Critical Heap Buffer Overflow in GStreamer JPEG Parser Enables Remote Code Execution
A heap-based buffer overflow in GStreamer's JPEG parser, tracked as CVE-2026-3082, allows remote code execution via crafted input and carries a CVSS score of 7.8.
A critical vulnerability in GStreamer's JPEG parser, designated CVE-2026-3082, has been disclosed by the Zero Day Initiative (ZDI-26-163). The flaw is a heap-based buffer overflow that arises during the processing of Huffman tables within the JPEG parsing code. An attacker can exploit this by supplying specially crafted input that, when processed by an application using the GStreamer library, triggers a write beyond the bounds of a fixed-length heap buffer due to insufficient length validation.
The vulnerability carries a CVSS score of 7.8 (High) with the vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, indicating that exploitation requires user interaction but no privileges. Attack vectors may vary depending on the implementation, but the flaw can lead to arbitrary code execution in the context of the current process. This makes it particularly dangerous in environments where GStreamer is used to handle untrusted media files, such as in media players, streaming services, or content processing pipelines.
GStreamer has released a fix for the vulnerability in commit 7d3c258ed928cf59d126c8ea926b185f046f444c, available on the project's GitLab repository. The disclosure timeline shows the vulnerability was reported to the vendor on February 11, 2026, with the coordinated public release of the advisory occurring on March 6, 2026. The researcher who reported the flaw chose to remain anonymous.
GStreamer is a widely used multimedia framework that underpins many Linux desktop environments, embedded systems, and media applications. The library's extensive use in processing untrusted media files makes vulnerabilities like this a significant concern for system administrators and security teams. While the CVSS score reflects a local attack vector, the requirement for user interaction—such as opening a malicious file or visiting a compromised website—means that phishing or social engineering campaigns could be used to deliver the exploit.
The fix addresses the root cause by adding proper validation of the length of user-supplied data before copying it to the heap buffer. Organizations using GStreamer in their software stacks should prioritize applying the patch to mitigate the risk of remote code execution. This vulnerability joins a growing list of media-parsing flaws that have been targeted by attackers, underscoring the importance of rigorous input validation in multimedia libraries.