Bug 2569389

Summary: CVE-2026-125704 gstreamer1: gstreamer: Use-after-free in GStreamer core buffer value deserialization [fedora-43]
Product: [Fedora] Fedora Reporter: lcelant
Component: gstreamer1Assignee: Wim Taymans <wtaymans>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: 43CC: dominik, gwync, multimedia-sig, wtaymans
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["6a0a391a-f83c-4c96-8dbd-82db34dcb18a"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2569128    

Description lcelant 2026-11-10 10:35:39 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

GStreamer-SA-2026-0028. In GStreamer core gst_value_deserialize_buffer() (subprojects/gstreamer/gst/gstvalue.c), the invalid-hex-character error path calls gst_buffer_unref(buffer) before gst_buffer_unmap(buffer, &info), so the unmap can access freed buffer memory. A crafted serialized GstBuffer value in a caps or structure string reaches this path. In a network-facing GStreamer Data Protocol receiver, gdpdepay can pass supplied CAPS data through gst_dp_caps_from_packet() to gst_caps_from_string() without prior content validation. Static review of upstream 1.28.2 confirmed the ordering bug and the network entry path; no dynamic PoC, ASan trace, information disclosure, or code-execution primitive was established. Upstream versions before 1.28.3 are affected; 1.28.3 contains the fix (merge request !11583). The public advisory does not identify a reporter.