CVE-2026-125707
Description
A flaw was found in GStreamer's MXF demuxer. When an application processes a crafted MXF file, an off-by-one bounds check can allow a one-byte write past the logical end of a temporal offset array. This may corrupt memory and cause the application to crash. The extent of the impact has not been demonstrated by a runtime test.
Statement
This vulnerability is rated Moderate because processing a crafted MXF file can trigger an out-of-range write in the demuxer's process. A user or ingest service must process the file; no attacker account is required. Based on current manifest versions and the upstream affected range, RHEL 7 ELS, RHEL 8, RHEL 9, and RHEL 10 streams through 10.3 are affected, with fixes deferred under the Moderate-severity policy. The RHEL 6 ELS affect is out of support scope for this issue. RHEL 10.4 and RHIVOS 2.1 are not affected. Fedora 43 packages are affected; Fedora 44 and Rawhide packages are not affected. The legacy 0.10 package branches were classified from the upstream version range and were not separately code-verified.
Mitigation
Where MXF processing is not required, set GST_PLUGIN_FEATURE_RANK=mxfdemux:NONE before launching a GStreamer application to prevent automatic selection of mxfdemux for untrusted files. This does not protect pipelines that explicitly instantiate mxfdemux.
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 | 6.1 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | Required | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | Low | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Red Hat CVSS v3 Score Explanation
AV:L/AC:L/PR:N/UI:R/S:U: a crafted MXF file must be processed by a local GStreamer application; no account or race is required. C:N: static review found a write, not the advisory's claimed read, and no disclosure path was established. I:L: an attacker-influenced byte can be written past the reverse temporal offset array's logical end. A:H: potential process crash from memory corruption is assessed, but no runtime test demonstrated a crash or established whether the write crosses allocated capacity. Static comparison confirmed the > to >= fix in 1.28.3.
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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