# CVE-2026-125707: Gst-plugins-bad: gst-plugins-bad: off-by-one write in mxf demuxer temporal offset table

Status: published. Published: 2026-11-10. Updated: 2026-11-12.

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.

## Remediation

- workaround: 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. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (gstreamer1-plugins-bad-free): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (gstreamer-plugins-bad-free): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (gstreamer1-plugins-bad-free): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (gstreamer-plugins-bad-free): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (gstreamer1-plugins-bad-free): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (gstreamer1-plugins-bad-free): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 7.1 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H; source: CNA: redhat

- CVSS 3.1: 6.1 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.15% as of 2026-11-12; percentile 4.53%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-787

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-125707 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2569127 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://gstreamer.freedesktop.org/security/sa-2026-0027.html (CNA: redhat)

- https://access.redhat.com/security/cve/CVE-2026-125707 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2569127 (secalert@redhat.com)

- https://gstreamer.freedesktop.org/security/sa-2026-0027.html (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-125707; retrieved 2026-11-12; source updated 2026-11-12

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-125707; retrieved 2026-11-11; source updated 2026-11-10

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-125707; retrieved 2026-11-12; source updated Not reported

Revision: 52da80a7b125f47597f833bc1569dd792aa6f0b9b47cbbd54aba0d90950fd399

Canonical: https://y2.dev/cve/CVE-2026-125707

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