Bug 2569506

Summary: CVE-2026-125712 gstreamer1-plugins-base: gst-plugins-base: Missing bounds checks in RTCP SDES packet parsing [fedora-43]
Product: [Fedora] Fedora Reporter: lcelant
Component: gstreamer1-plugins-baseAssignee: Wim Taymans <wtaymans>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: 43CC: gwync, multimedia-sig, negativo17, wtaymans
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["d188c79d-da55-4ee2-81a9-c8d6f2862f1a"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 2569130    

Description lcelant 2026-11-10 12:22:17 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-2026-0030 affects gst-plugins-base RTCP SDES parsing in versions before 1.28.4. Static review of upstream 1.28.3 confirmed that gst_rtcp_packet_sdes_get_entry() in gst-libs/gst/rtp/gstrtcpbuffer.c checks the entry type and length header but does not verify that the attacker-controlled entry value length fits within the received RTCP packet. A crafted SDES entry delivered to an active RTP/RTCP session can therefore cause an out-of-bounds read, with a possible receiver crash or limited adjacent-memory disclosure. The parser also undercounts the packet length by four bytes in several SDES walk functions; this undercount alone appears to make those loop bounds stricter, while the missing entry-value check is independently sufficient for the read. The flaw was verified by static source review only; no build or PoC was run. Upstream fixed this in gst-plugins-base 1.28.4 (GStreamer merge request 11791).