# CVE-2026-125704: Gstreamer: gstreamer: use-after-free in gstreamer core buffer value deserialization

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

A use-after-free flaw was found in GStreamer core buffer value deserialization. When crafted serialized buffer data contains an invalid character, an error path frees a mapped buffer before unmapping it. An application that parses untrusted caps or structure data could crash; a network-facing GStreamer Data Protocol receiver can process such data without user interaction. Further impact has not been established.

## Remediation

- workaround: There is no complete mitigation for applications that continue to deserialize untrusted GStreamer caps or structure strings. Restrict access to network-facing GStreamer Data Protocol receivers to trusted peers, and avoid passing externally supplied strings to gst_caps_from_string() or gst_structure_from_string() until an update is available. These measures reduce exposure only where the application can control those input paths. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (gstreamer1): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (gstreamer1): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (gstreamer1): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (gstreamer1): Version range not reported. Source: CNA: redhat
- GStreamer / gstreamer (gstreamer): ≥ 0.0.0; < 1.28.3 (affected, semver). Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-416

## Exploit evidence

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

## References

- https://access.redhat.com/security/cve/CVE-2026-125704 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2569128 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/11583.patch (CNA: redhat)

- https://gstreamer.freedesktop.org/security/sa-2026-0028.html (CNA: redhat)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-125704; retrieved 2026-11-10; source updated 2026-11-10

Revision: 88230626a284fb4b7f47a640655970170d7ce138b2a04691b96ea325c0800c88

Canonical: https://y2.dev/cve/CVE-2026-125704

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