CVE-2026-119610
Description
A flaw was found in GStreamer's gst-plugins-good, specifically in the H.264 RTP depayloader element. When processing MTAP16 or MTAP24 multi-time aggregation RTP packets, a signed/unsigned integer conversion error causes the remaining-length counter to underflow to a large positive value when the packet is truncated. This allows a remote, unauthenticated attacker to trigger an out-of-bounds heap read of up to approximately 64 KiB of process memory by sending a single malformed RTP packet. Successful exploitation can crash the receiving GStreamer pipeline (denial of service), and in relay or transcoding deployments where output is accessible to the attacker, may expose adjacent heap contents.
Statement
This vulnerability is rated Important severity because a remote, unauthenticated attacker can trigger an out-of-bounds heap read and denial of service with a single malformed H.264 RTP packet on any pipeline that auto-plugs the rtph264depay element. The vulnerable MTAP16/MTAP24 code path was introduced in upstream gst-plugins-good 1.28.0. Red Hat product impact analysis is in progress: RHEL and related products ship gstreamer1-plugins-good at versions below 1.28.0 today and are expected not to include this code path until rebased; Fedora 44 ships gstreamer1-plugins-good 1.28.8 and is affected pending confirmation.
Mitigation
Block untrusted H.264 RTP streams at the network perimeter (firewall or UDP ingress filter) to prevent malformed packets from reaching GStreamer pipelines. Alternatively, disable or avoid deploying the rtph264depay GStreamer element when processing RTP 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 | 8.2 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | Low | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Red Hat CVSS v3 Score Explanation
Network-delivered single UDP/RTP packet; unauthenticated; no user interaction required on server pipelines; DoS (crash) is high; heap-content leak into output stream is low (requires observable relay/transcode path)
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Memory
An attacker could get secret values such as cryptographic keys, PII, memory addresses, or other information that could be used in additional attacks.
Confidentiality
Technical Impact: Bypass Protection Mechanism
Out-of-bounds memory could contain memory addresses or other information that can be used to bypass ASLR and other protection mechanisms in order to improve the reliability of exploiting a separate weakness for code execution.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
An attacker could cause a segmentation fault or crash by causing memory to be read outside of the bounds of the buffer. This is especially likely when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string.
Other
Technical Impact: Varies by Context
The read operation could produce other undefined or unexpected results.
Acknowledgements
Upstream acknowledges Ada Logics (Ada Logics) and Claude (Anthropic) as the original reporters.
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