CVE-2026-18393
Received Received - Intake

Heap Buffer Overflow in FFmpeg via TDSC Cursor Processing

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: redhat-SADP

Description
A flaw was found in FFmpeg. The tdsc_load_cursor() function writes beyond the bounds of a heap-allocated buffer when processing crafted TDSC cursor data. A remote attacker could exploit this by supplying a specially crafted video file, potentially leading to a denial of service or arbitrary code execution.

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Meta Information

Published
2026-08-28
Last Modified
2026-08-28
Generated
2026-08-28
AI Q&A
2026-08-28
EPSS Evaluated
N/A
NVD
CVE-2026-18393
EUVD
EUVD-2026-67655

Affected Vendors & Products

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

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.

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Executive Summary

This vulnerability is a heap-based buffer overflow in FFmpeg's tdsc_load_cursor() function. It occurs when processing specially crafted TDSC cursor data in video files. The flaw allows writing beyond allocated memory, which could be exploited by an attacker to cause a denial of service or execute arbitrary code.

Impact Analysis

If exploited, this vulnerability could allow an attacker to crash the application (denial of service) or run malicious code on your system. This might lead to unauthorized access, data theft, or system compromise if you process untrusted video files containing the crafted TDSC cursor data.

Mitigation Strategies

Update FFmpeg to the latest patched version immediately to address the heap buffer overflow in tdsc_load_cursor(). Disable processing of untrusted or suspicious video files until patched. Monitor network traffic for unusual video file transfers.

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