A flaw was found in GStreamer's gst-plugins-bad H.265 video parser. When parsing a specially crafted H.265 bitstream containing a Screen Content Coding (SCC) extension with certain palette predictor initializer settings, an integer underflow in the upper-bound computation allows the parser to accept an out-of-range value for the number of palette predictor entries. This causes the parser to write beyond the end of a fixed-size array, resulting in memory corruption and an application crash.
Successful exploitation requires an attacker to provide a malformed H.265 media file to a vulnerable application, and is limited to a denial-of-service impact.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://access.redhat.com/security/cve/CVE-2026-119727
secalert@redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2564118
secalert@redhat.com
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/10902.patch
secalert@redhat.com
https://gstreamer.freedesktop.org/security/sa-2026-0012.html
secalert@redhat.com