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Fencer Intel
high 7.8

CVE-2026-3084 json

GStreamer H.266 Codec Parser Integer Underflow Remote Code Execution Vulnerability

published 7mo ago modified 3mo ago also EUVD-2026-12127

cvss
7.8
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

Summary

GStreamer H.266 Codec Parser Integer Underflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation.

The specific flaw exists within the parsing of picture partitions. The issue results from the lack of proper validation of user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-28910.

Patch / fix

  • gstreamer gstreamer 1.28.1
  • gst-plugins-bad1.0 Debian 13 1.26.2-3+deb13u1
  • gst-plugins-bad1.0 Debian 14 1.28.1-1

debian advisories DEBIAN-CVE-2026-3084

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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-2026-3084 updated cvss 7.8

GStreamer: GStreamer: Remote Code Execution via integer underflow in H.266 Codec Parser

  • Red Hat Enterprise Linux 6 gstreamer, gstreamer-tools
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 mingw32-gstreamer1, mingw64-gstreamer1
    affected: workaround, no fix available
  • Red Hat Enterprise Linux 7 gstreamer, gstreamer1, gstreamer-tools
    not affected: vulnerable code not present
  • Red Hat Enterprise Linux 8 gstreamer1 Red Hat Enterprise Linux 9 gstreamer1 Red Hat Enterprise Linux 10 gstreamer1
    not affected: component not present

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
total
Assessed
7mo ago

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.0 7.8 CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • GStreamer GStreamer
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-191 Integer Underflow (Wrap or Wraparound)

References

Sources

Fencer Intel 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.