--- id: CVE-2026-18649 title: A flaw was found in the GStreamer gst-plugins-good package summary: >- 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, u… severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H' cwe: - CWE-770 vendor: Red Hat product: gstreamer1-plugins-good affected: - gstreamer1-plugins-good (all versions) - gstreamer1-plugins-good (all versions) - gstreamer1-plugins-good (all versions) - gstreamer1-plugins-good (all versions) - gstreamer1-plugins-good (all versions) - gstreamer1-plugins-good (all versions) - gstreamer1-plugins-good (all versions) - gstreamer1-plugins-good (all versions) - gstreamer1-plugins-good (all versions) - gstreamer1-plugins-good (all versions) - gstreamer1-plugins-good (all versions) - gstreamer1-plugins-good (all versions) - gstreamer1-plugins-good (all versions) - gstreamer1-plugins-good (all versions) patched: - enterprise_linux_appstream_eus_v_10_0 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_8 - enterprise_linux_appstream_e4s_v_9_2 - enterprise_linux_appstream_e4s_v_9_4 - enterprise_linux_appstream_eus_v_9_6 - enterprise_linux_appstream_v_9 published: '2026-08-06' updated: '2026-09-23' sourceUpdated: '2026-09-23T15:17:13.373' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18649' references: - url: 'https://0xsemizzz.vercel.app/projects/cve-2026-18649-gstreamer-rtp-dos/' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:53451' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:53452' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:56966' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:61588' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:61943' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:65959' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:65999' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:69232' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:70264' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:70584' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:70803' label: secalert@redhat.com - url: 'https://access.redhat.com/security/cve/CVE-2026-18649' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2510614' label: secalert@redhat.com - url: 'https://github.com/0xSemizzz/CVE-2026-18649' label: secalert@redhat.com - url: >- https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/113 label: secalert@redhat.com - url: 'https://0xsemizzz.vercel.app/blog/cve-2026-18649-gstreamer-rtp-dos/' label: secalert@redhat.com - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-18649.json - url: 'https://www.cve.org/CVERecord?id=CVE-2026-18649' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18649' tags: - nvd - cve.org - exploit-available - csaf - vex - red-hat ssvc: exploitation: none automatable: 'yes' technicalImpact: partial timestamp: '2026-08-06T13:42:01.159055Z' epss: 0.00961 epssPercentile: 0.59891 exploits: github: 1 githubRepos: - 'https://github.com/0xSemizzz/CVE-2026-18649' checkedAt: '2026-09-25T08:20:52.077Z' exploitAvailable: true ingestedAt: '2026-09-09T14:11:29.385Z' --- ## Overview 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. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2026:65959** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-09-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:65959) - **RHSA-2026:53451** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-08-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:53451) - **RHSA-2026:56966** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-08-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:56966) - **RHSA-2026:65999** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-09-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:65999) - **RHSA-2026:61588** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61588) - **RHSA-2026:61943** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6) · released 2026-09-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:61943) - **RHSA-2026:53452** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-08-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:53452) - **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 7 · no fix planned: Red Hat Enterprise Linux 7 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-18649.json) - **RHSA-2026:69232** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69232) - **RHSA-2026:70264** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS) · released 2026-09-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:70264) - **RHSA-2026:70584** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:70584) - **RHSA-2026:70803** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:70803)