# CVE-2026-18649: Gstreamer1-plugins-good: gst-plugins-good: unbounded memory growth in rtph264depay and rtph265depay rtp depayloaders > Remote attackers can cause denial of service in GStreamer applications by sending fragmented RTP packets that exhaust memory due to missing size limits in H.264/H.265 depayloaders. - **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 6 Aug 2026 - **Updated:** 23 Sep 2026 - **Also known as:** ALSA-2026:53451, ALSA-2026:53452, CLSA-2026-1786699059, CLSA-2026-1786714360, DEBIAN-CVE-2026-18649, ECHO-49ac-ba0f-ce98, GHSA-wr93-5xph-995g, RHSA-2026:53451, RHSA-2026:53452, RHSA-2026:61588, RHSA-2026:61943, RHSA-2026:65999, RLSA-2026:53451, RLSA-2026:53452, ROOT-OS-DEBIAN-12-CVE-2026-18649, ROOT-OS-DEBIAN-13-CVE-2026-18649, UBUNTU-CVE-2026-18649, USN-8778-1 ## What is CVE-2026-18649? CVE-2026-18649 is a high-severity denial of service vulnerability in Red Hat Enterprise Linux 10, published on 6 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official 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. Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling) ## Which versions are affected by CVE-2026-18649? | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `gstreamer1-plugins-good` | AlmaLinux:10 | All versions | 1.26.7-2.el10_2.3 | | `gstreamer1-plugins-good-gtk` | AlmaLinux:10 | All versions | 1.26.7-2.el10_2.3 | | `gstreamer1-plugins-good` | AlmaLinux:9 | All versions | 1.22.12-7.el9_8.2 | | `gstreamer1-plugins-good-gtk` | AlmaLinux:9 | All versions | 1.22.12-7.el9_8.2 | | `gstreamer1-plugins-good` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.26.7-2.el10_2.3 | | `gstreamer1-plugins-good-debuginfo` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.26.7-2.el10_2.3 | | `gstreamer1-plugins-good-debugsource` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.26.7-2.el10_2.3 | | `gstreamer1-plugins-good-gtk` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.26.7-2.el10_2.3 | | `gstreamer1-plugins-good-gtk-debuginfo` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.26.7-2.el10_2.3 | | `gstreamer1-plugins-good-qt6-debuginfo` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.26.7-2.el10_2.3 | | `gstreamer1-plugins-good` | Red Hat:enterprise_linux:9::appstream | All versions | 0:1.22.12-7.el9_8.2 | | `gstreamer1-plugins-good-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:1.22.12-7.el9_8.2 | | `gstreamer1-plugins-good-debugsource` | Red Hat:enterprise_linux:9::appstream | All versions | 0:1.22.12-7.el9_8.2 | | `gstreamer1-plugins-good-gtk` | Red Hat:enterprise_linux:9::appstream | All versions | 0:1.22.12-7.el9_8.2 | | `gstreamer1-plugins-good-gtk-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:1.22.12-7.el9_8.2 | | `gstreamer1-plugins-good-qt-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:1.22.12-7.el9_8.2 | | `gstreamer1-plugins-good` | Red Hat:rhel_e4s:9.2::appstream | All versions | 0:1.18.4-8.el9_2.2 | | `gstreamer1-plugins-good-debuginfo` | Red Hat:rhel_e4s:9.2::appstream | All versions | 0:1.18.4-8.el9_2.2 | | `gstreamer1-plugins-good-debugsource` | Red Hat:rhel_e4s:9.2::appstream | All versions | 0:1.18.4-8.el9_2.2 | | `gstreamer1-plugins-good-gtk` | Red Hat:rhel_e4s:9.2::appstream | All versions | 0:1.18.4-8.el9_2.2 | | `gstreamer1-plugins-good-gtk-debuginfo` | Red Hat:rhel_e4s:9.2::appstream | All versions | 0:1.18.4-8.el9_2.2 | | `gstreamer1-plugins-good-qt-debuginfo` | Red Hat:rhel_e4s:9.2::appstream | All versions | 0:1.18.4-8.el9_2.2 | | `gstreamer1-plugins-good` | Red Hat:rhel_e4s:9.4::appstream | All versions | 0:1.22.1-4.el9_4.2 | | `gstreamer1-plugins-good-debuginfo` | Red Hat:rhel_e4s:9.4::appstream | All versions | 0:1.22.1-4.el9_4.2 | | `gstreamer1-plugins-good-debugsource` | Red Hat:rhel_e4s:9.4::appstream | All versions | 0:1.22.1-4.el9_4.2 | | `gstreamer1-plugins-good-gtk` | Red Hat:rhel_e4s:9.4::appstream | All versions | 0:1.22.1-4.el9_4.2 | | `gstreamer1-plugins-good-gtk-debuginfo` | Red Hat:rhel_e4s:9.4::appstream | All versions | 0:1.22.1-4.el9_4.2 | | `gstreamer1-plugins-good-qt-debuginfo` | Red Hat:rhel_e4s:9.4::appstream | All versions | 0:1.22.1-4.el9_4.2 | | `gstreamer1-plugins-good` | Red Hat:rhel_eus:9.6::appstream | All versions | 0:1.22.12-5.el9_6.2 | | `gstreamer1-plugins-good-debuginfo` | Red Hat:rhel_eus:9.6::appstream | All versions | 0:1.22.12-5.el9_6.2 | | `gstreamer1-plugins-good-debugsource` | Red Hat:rhel_eus:9.6::appstream | All versions | 0:1.22.12-5.el9_6.2 | | `gstreamer1-plugins-good-gtk` | Red Hat:rhel_eus:9.6::appstream | All versions | 0:1.22.12-5.el9_6.2 | | `gstreamer1-plugins-good-gtk-debuginfo` | Red Hat:rhel_eus:9.6::appstream | All versions | 0:1.22.12-5.el9_6.2 | | `gstreamer1-plugins-good-qt-debuginfo` | Red Hat:rhel_eus:9.6::appstream | All versions | 0:1.22.12-5.el9_6.2 | | `gstreamer1-plugins-good` | Rocky Linux:10 | All versions | 0:1.26.7-2.el10_2.3 | | `gstreamer1-plugins-good` | Rocky Linux:9 | All versions | 0:1.22.12-7.el9_8.2 | ## How do I fix CVE-2026-18649? Apply the vendor's patch. ## Is CVE-2026-18649 being exploited? There is no known exploitation of CVE-2026-18649 in the wild and no public exploit code. Public exploit code: - Proof of concept for CVE-2026-18649, a remote denial of service vulnerability in GStreamer's H.264 RTP depayloader (rtph264depay). (github_poc): https://github.com/0xSemizzz/CVE-2026-18649 ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-18649 and fix it if it is affected. What it is: CVE-2026-18649 is a high-severity denial of service vulnerability in Red Hat Enterprise Linux 10, published on 6 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2026-18649 in the wild and no public exploit code. Affected product: Red Hat Enterprise Linux 10. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2026-18649/ (Markdown: https://insights.sbomify.com/CVE-2026-18649/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-18649 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-18649 - OSV: https://osv.dev/vulnerability/CVE-2026-18649 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-18649/ Summaries are generated and may contain mistakes; the official description above is the record.