CVE-2026-18649
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.88%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.88% probability · 57th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-770
- Source
- secalert@redhat.com
References
- https://0xsemizzz.vercel.app/blog/cve-2026-18649-gstreamer-rtp-dos/
- https://access.redhat.com/errata/RHSA-2026:53451
- https://access.redhat.com/errata/RHSA-2026:53452
- https://access.redhat.com/errata/RHSA-2026:56966
- https://access.redhat.com/errata/RHSA-2026:61588
- https://access.redhat.com/errata/RHSA-2026:61943
- https://access.redhat.com/errata/RHSA-2026:65959
- https://access.redhat.com/errata/RHSA-2026:65999
- https://access.redhat.com/security/cve/CVE-2026-18649
- https://bugzilla.redhat.com/show_bug.cgi?id=2510614
- https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/113
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.