CVE-2026-121611
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Use of Uninitialized Memory in GStreamer gst-plugins-bad H.265 Parser
Vulnerability report for CVE-2026-121611, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-11-09
Last updated on: 2026-11-09
Assigner: redhat-SADP
Description
Description
A flaw was found in GStreamer's gst-plugins-bad package. A use of uninitialized memory vulnerability exists in the H.265 (HEVC) bitstream parser when processing Video Parameter Sets that declare more than one HRD (Hypothetical Reference Decoder) parameter set. A remote attacker could exploit this by providing a crafted H.265 media file or stream that, when processed by an application using GStreamer, causes unpredictable parser behavior and may crash the application. This can lead to a denial of service for any application using GStreamer to play back H.265 content.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | * |
| Red Hat | Red Hat Enterprise Linux 8 | * |
| Red Hat | Red Hat Enterprise Linux 9 | * |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-457 | The code uses a variable that has not been initialized, leading to unpredictable or unintended results. |
