CVE-2026-5056
Received Received - Intake

Stack-based Buffer Overflow in GStreamer qtdemux

Publication date: 2026-07-29

Last updated on: 2026-07-30

Assigner: Zero Day Initiative

Description
GStreamer qtdemux Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The specific flaw exists within the parsing of UncompressedFrameConfigBox structures. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29392.

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Meta Information

Published
2026-07-29
Last Modified
2026-07-30
Generated
2026-07-30
AI Q&A
2026-07-30
EPSS Evaluated
N/A
NVD
CVE-2026-5056

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
gstreamer gstreamer *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

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Executive Summary

This is a stack-based buffer overflow in GStreamer's qtdemux component. It occurs when parsing UncompressedFrameConfigBox structures due to insufficient validation of user-supplied data length before copying to a fixed stack buffer. Attackers can exploit this to execute arbitrary code on affected systems.

Impact Analysis

If you use GStreamer with qtdemux functionality, an attacker could remotely execute code on your system by sending specially crafted media files. This could lead to full system compromise, data theft, or further network attacks depending on your environment.

Mitigation Strategies

Update GStreamer to the latest patched version immediately to address the stack-based buffer overflow in qtdemux. Disable or restrict access to media parsing functions if updates are not immediately available.

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