---
id: "CVE-2026-121611"
page: "https://infrastack.ai/live/CVE-2026-121611"
kind: "vulnerability"
aliases: ["CVE-2026-121611"]
title: "GStreamer: crafted H.265 file can crash media apps via uninitialized memory"
severity: "medium"
cvss: 6.5
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["gst-plugins-bad", "gstreamer", "h265", "media-playback", "package"]
not_affected_if: ["no-h265-input"]
published_at: "2026-11-09T13:17:07+00:00"
first_seen_at: "2026-11-09T13:26:50+00:00"
updated_at: "2026-11-09T13:27:39+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121611", "first_seen_at": "2026-11-09T13:26:50+00:00"}]
exploit_sources: []
---

# GStreamer: crafted H.265 file can crash media apps via uninitialized memory

Link for people: https://infrastack.ai/live/CVE-2026-121611 (this .md is for agents)

A flaw in GStreamer's gst-plugins-bad H.265 (HEVC) parser reads uninitialized memory when a video parameter set declares more than one HRD parameter set. A crafted H.265 file or stream can make parsing behave unpredictably and crash any application using GStreamer to play it, causing denial of service.

_Summary, check and fix written by a model from the sources; labelled as such._

## Timeline

- 2026-11-09T13:26:50+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121611

## From the sources

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.

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