CVE-2026-18393
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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
2026-09-17
AI Q&A
2026-08-28
EPSS Evaluated
2026-09-15
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.

Detection Guidance

To detect this vulnerability, monitor for crashes or memory corruption when processing TDSC-encoded video files. Check FFmpeg versions for the vulnerable code in libavcodec/tdsc.c. Use network traffic analysis to identify untrusted video file transfers. Commands like 'ffmpeg -version' can show the installed version, but detection primarily relies on avoiding untrusted content until patched.

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.

Compliance Impact

This vulnerability could potentially lead to arbitrary code execution or denial of service, which may result in unauthorized access to sensitive data. Such breaches could violate compliance requirements under GDPR or HIPAA if exploited.

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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