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Fencer Vulns
medium 6.5

CVE-2026-53701 json

Gstreamer1-plugins-bad-free: gstreamer: out-of-bounds write in h.266/vvc pps picture partition parser

published 2026-06-11 4 mo ago modified 2026-11-05 3 d ago also EUVD-2026-36294

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits
0
none known

Summary

An out-of-bounds write vulnerability was found in GStreamer's H.266/VVC PPS picture partition parser in gst-plugins-bad. In the multi-slice-in-tile processing of gst_h266_parser_parse_picture_partition() (gsth266parser.c), the loop iterates without checking that the slice index stays within bounds, writing past three fixed-size arrays (slice_height_in_ctus, slice_top_left_ctu_x, slice_top_left_ctu_y) in the GstH266PPS structure. While the initial proof-of-concept demonstrated a 4-byte out-of-bounds write, the code permits larger writes across multiple iterations. A crafted H.266/VVC media file can trigger this vulnerability.

Patch / fix

  • gst-plugins-bad1.0 Debian 13 1.26.2-3+deb13u2
  • gst-plugins-bad1.0 Debian 14 1.28.3-1

debian advisories DEBIAN-CVE-2026-53701

  • gst-plugins-bad1.0 Ubuntu 26.04 LTS 1.28.2-1ubuntu1.1

ubuntu advisories UBUNTU-CVE-2026-53701

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • gstreamer-plugins-bad SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.26.7-160000.3.1

suse advisories SUSE-SU-2026:22752-1SUSE-SU-2026:22817-1

  • gstreamer-plugins-bad openSUSE Leap 16.0 1.26.7-160000.3.1

opensuse advisories openSUSE-SU-2026:21370-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-53701 updated cvss 6.5

gstreamer1-plugins-bad-free: GStreamer: Out-of-bounds write in H.266/VVC PPS picture partition parser

  • Red Hat Enterprise Linux 7 gstreamer1-plugins-bad-free, gstreamer1-plugins-bad-free-gtk, gstreamer1-plugins-bad-free 1.26.7-2.el10 Red Hat Enterprise Linux 8 gstreamer1-plugins-bad-free, gstreamer1-plugins-bad-free 1.26.7-2.el10 Red Hat Enterprise Linux 9 gstreamer1-plugins-bad-free, gstreamer1-plugins-bad-free-libs, gstreamer1-plugins-bad-free 1.26.7-2.el10 Red Hat Enterprise Linux 10 gstreamer1-plugins-bad-free 1.26.7-2.el10
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.