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Fencer Vulns
medium 6.5

CVE-2026-53702 json

Gstreamer1-plugins-bad-free: gstreamer: stack buffer overflow in h.265 buffering period sei parser

published 2026-06-11 4 mo ago modified 2026-11-05 3 d ago also EUVD-2026-36295

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 13%
public exploits
0
none known

Summary

A stack buffer overflow flaw was found in the GStreamer H.265 codec parser library (gst-plugins-bad). When parsing a buffering period SEI message, the parser uses an incorrect loop bound derived from cpb_cnt_minus1[i] (the loop index) instead of the sub-layer 0 CPB count cpb_cnt_minus1[0] from the referenced Sequence Parameter Set. A crafted H.265 video file or stream can cause the parser to write beyond the bounds of stack-allocated CPB delay arrays, resulting in a crash or potential stack memory corruption.

Patch / fix

  • gst-plugins-bad1.0 Debian 12 1.22.0-4+deb12u8
  • gst-plugins-bad1.0 Debian 14 1.28.3-1

debian advisories DEBIAN-CVE-2026-53702

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

ubuntu advisories UBUNTU-CVE-2026-53702

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 for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 1.20.1-150400.3.29.1
  • gstreamer-plugins-bad SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 1.22.0-150500.3.34.1
  • gstreamer-plugins-bad SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.26.7-160000.3.1
  • gstreamer-plugins-bad SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Package Hub 15 SP7 +2 more 1.24.0-150600.4.9.1
  • gstreamer-plugins-bad SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 1.8.3-18.21.1

suse advisories SUSE-SU-2026:3299-1SUSE-SU-2026:3133-1SUSE-SU-2026:3125-1SUSE-SU-2026:22752-1SUSE-SU-2026:22817-1SUSE-SU-2026:3058-1

  • 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-2026-53702 updated cvss 6.5

gstreamer1-plugins-bad-free: GStreamer: Stack buffer overflow in H.265 buffering period SEI 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

0.23% chance of exploitation in the next 30 days, higher than 13% 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.