CVE-2026-75143
Description
A flaw was found in FFmpeg. A heap buffer overflow in the RIST protocol reader allows a remote attacker to trigger memory corruption by sending an oversized packet to an FFmpeg instance receiving a RIST stream. The librist_read() function ignores its buffer size argument, copying the full payload into the caller-provided buffer without bounds checking. This could lead to denial of service or arbitrary code execution.
Statement
The ffmpeg package is not shipped in base Red Hat Enterprise Linux. It is available through EPEL and Fedora with librist support enabled. Red Hat Enterprise Linux AI ships a reduced FFmpeg build that explicitly excludes librist, making the RIST code path unreachable. Red Hat OpenShift AI container images do not directly install FFmpeg. Exploitation requires the victim to be actively receiving a RIST stream, which is a niche broadcast video protocol not used in typical RH product deployments.
Mitigation
No mitigation is currently available for this flaw.
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 | 9.8 | N/A | 9.8 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| 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:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Buffer overflows often can be used to execute arbitrary code, which is usually outside the scope of the product's implicit security policy. This can often be used to subvert any other security service.
Availability
Technical Impact: Modify Memory; DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU)
Buffer overflows generally lead to crashes. Other attacks leading to lack of availability are possible, including putting the product into an infinite loop.
Acknowledgements
Upstream acknowledges Joshua Rogers (AISLE Research) as the original reporter.
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
