Medium severity · published Aug 28, 2026
CVE-2026-18393
Ffmpeg: ffmpeg: heap buffer overflow in tdsc_load_cursor() via cur_fmt_mono cursor
5.4
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H
Attack vector
Adjacent
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Enterprise Linux AI (RHEL AI) 3 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat OpenShift AI (RHOAI) · Red Hat
All versions, or not specified · source: vendor
Affected product
RH
Red Hat Enterprise Linux AI (RHEL AI) 3
Red Hat
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18393
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-18393
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-18393
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2520309
github.com
https://github.com/FFmpeg/FFmpeg/commit/242ff799c75f20bade946314c8d741d0887ee11c
patchwork.ffmpeg.org
https://patchwork.ffmpeg.org/project/ffmpeg/patch/177767065817.63.1948165304485903849@29965ddac10e/
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