CVE-2026-119777
Description
A flaw was found in GStreamer's gst-plugins-bad H.266/VVC parser. When processing a malformed H.266 media file or stream, an integer overflow while parsing profile, tier, and level fields can lead to a stack-based buffer overflow. An attacker could cause an application to crash and may be able to execute code in the context of the affected application.
Statement
This vulnerability is rated as Important because a crafted H.266/VVC bitstream can cause a stack out-of-bounds write in GStreamer, potentially crashing the application or allowing code execution with the application's privileges. Exploitation requires a GStreamer-based application to process attacker-controlled H.266/VVC media; a user or service must open or ingest the file or stream. Based on the currently recorded package versions, gstreamer1-plugins-bad-free in RHEL 10.2.z, 10.3.z, and 10.4 and RHIVOS 2.1 and 2.1-core is affected. Fedora 43, including its MinGW package, is also affected. RHEL 7 through 9 and RHEL 10.0 ship versions that predate the vulnerable code. Fedora 44 and Rawhide ship versions in which the vulnerable code is no longer present.
Mitigation
There is no complete mitigation for this vulnerability. As a risk-reduction measure, disable H.266/VVC media ingestion in GStreamer-based applications and media pipelines where that feature is not required. Until a fixed package is available, do not open or transcode H.266/VVC files or streams from untrusted sources.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8.8 | N/A | 8.8 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | Required | N/A | Required |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Red Hat CVSS v3 Score Explanation
Upstream confirms the H.266/VVC parser processes network-delivered bitstreams (HTTP, HLS, DASH, RTSP, RTP, WebRTC) as well as local files. UI:R because a user or pipeline must open or play the content. Stack overflow can crash the process and may allow code execution.
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Write operations could cause memory corruption. In some cases, an adversary can modify control data such as return addresses in order to execute unexpected code.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
Attempting to access out-of-range, invalid, or unauthorized memory could cause the product to crash.
Other
Technical Impact: Unexpected State
Subsequent write operations can produce undefined or unexpected results.
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