CVE-2026-18393

Ffmpeg: ffmpeg: heap buffer overflow in tdsc_load_cursor() via cur_fmt_mono cursor

Published Aug 28, 2026 CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Workaround

Avoid opening untrusted TDSC-encoded video content with vulnerable FFmpeg consumers until a patched version is available.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Ffmpeg
Ffmpeg ffmpeg
Red Hat
Red Hat red Hat Openshift Ai (rhoai)
Vendors & Products Ffmpeg
Ffmpeg ffmpeg
Red Hat
Red Hat red Hat Openshift Ai (rhoai)
Type Values Removed Values Added
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.
Title Ffmpeg: ffmpeg: heap buffer overflow in tdsc_load_cursor() via cur_fmt_mono cursor
First Time appeared Redhat
Redhat enterprise Linux Ai
Redhat openshift Ai
Weaknesses CWE-787
CPEs cpe:/a:redhat:enterprise_linux_ai:3
cpe:/a:redhat:openshift_ai
Vendors & Products Redhat
Redhat enterprise Linux Ai
Redhat openshift Ai
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Aug 28, 2026, 3:55 PM
Reserved
Jul 30, 2026, 2:46 PM
Status
Awaiting Analysis
Published
Aug 28, 2026, 12:16 PM
Modified
Aug 28, 2026, 8:17 PM