EUVD-2026-53768
GHSA-wr93-5xph-995g
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable with no auth or interaction required; impact is process termination only, no confidentiality or integrity loss.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
Lifecycle Timeline
2DescriptionCVE.org
A flaw was found in the GStreamer gst-plugins-good package. The rtph264depay and rtph265depay RTP depayloader elements do not enforce a maximum size limit on the reassembly buffer used during fragmented RTP packet processing. A remote, unauthenticated attacker can send a continuous stream of RTP fragments without ever transmitting an end-of-fragment marker, causing the reassembly buffer to grow without bound until process memory is exhausted. This results in a denial of service through process termination.
AnalysisAI
Unbounded memory growth in GStreamer's RTP H.264 and H.265 depayloader elements allows a remote unauthenticated attacker to exhaust process memory and terminate any application consuming RTP video streams. The rtph264depay and rtph265depay elements in gst-plugins-good lack an upper bound on their internal reassembly buffer, meaning an attacker who continuously sends fragmented RTP packets while withholding the end-of-fragment marker can grow that buffer without limit. No public exploit has been identified at time of analysis, and CISA KEV listing is absent, but the CVSS vector (AV:N/AC:L/PR:N/UI:N) indicates this is trivially exploitable against any exposed GStreamer RTP pipeline.
Technical ContextAI
GStreamer's gst-plugins-good provides RTP depayloader elements (rtph264depay, rtph265depay) that reconstruct fragmented RTP payloads carrying H.264 and H.265 compressed video before passing them downstream for decoding. RTP fragmentation is standard in video streaming - large NAL units are split across multiple RTP packets and reassembled at the receiver using a start/continuation/end bit scheme. The flaw (CWE-770: Allocation of Resources Without Limits or Throttling) is the complete absence of a size ceiling on the internal reassembly buffer. Because the code only completes and flushes the buffer upon receiving an end-of-fragment marker, an attacker who never sends that marker causes indefinite buffer accumulation. Affected deployments are documented in CPE as the gst-plugins-good package across Red Hat Enterprise Linux 7, 8, 9, and 10 (cpe:2.3:a:red_hat:red_hat_enterprise_linux_{7,8,9,10}).
RemediationAI
The primary remediation is to apply the vendor-supplied patch once released by Red Hat for RHEL 7, 8, 9, and 10 via the standard errata process; monitor https://access.redhat.com/security/cve/CVE-2026-18649 for errata availability. An upstream fix exists as GStreamer Security merge request #113 at https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/113, but a tagged release version incorporating this fix has not been independently confirmed from available data, so 'upstream fix available (PR/commit); released patched version not independently confirmed' is the correct patch status. Until a patch is applied, compensating controls should target the attack surface directly: restrict RTP ingress to trusted source IP ranges at the network perimeter or host firewall, reducing exposure to untrusted senders. Applications that do not require H.264 or H.265 RTP input should disable or remove the rtph264depay and rtph265depay elements from their GStreamer pipelines. Enforcing OS-level memory limits (ulimit -v or systemd MemoryMax) on the GStreamer process will bound the damage to a single process crash rather than full host memory exhaustion, at the cost of potentially terminating legitimate streams under high load.
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View allVendor StatusVendor
SUSE
Severity: Important| Product | Status |
|---|---|
| SUSE Liberty Linux 10 | Fixed |
| SUSE Liberty Linux 9 | Fixed |
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External POC / Exploit Code
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