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CVE-2025-6663

GStreamer H266 Codec Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability

7.8 HighFix available

GStreamer H266 Codec Parsing Stack-based Buffer Overflow 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 H266 sei messages. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-27381.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.39%Up 0.4 points since Jul 8, 2025
90%50%10%1%

What each source reports

CVE List Score used 7.8

GStreamer H266 Codec Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability

GStreamer H266 Codec Parsing Stack-based Buffer Overflow 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 H266 sei messages. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-27381.

Record
CVE-2025-6663
CVSS 3.0
7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-121
Updated
2026-11-02
EUVDEUVD-2025-20240 7.8

GStreamer H266 Codec Parsing Stack-based Buffer Overflow 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 H266 sei messages. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-27381.

Record
EUVD-2025-20240
CVSS 3.0
7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-8539-chjx-chcc 7.8

GStreamer H266 Codec Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability....

GStreamer H266 Codec Parsing Stack-based Buffer Overflow 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 H266 sei messages. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-27381.

Record
GHSA-8539-chjx-chcc
CVSS 3.0
7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-121, CWE-787
Updated
2026-11-02
NVD 7.8

GStreamer H266 Codec Parsing Stack-based Buffer Overflow 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 H266 sei messages. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-27381.

Record
CVE-2025-6663
CVSS 3.0
7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-121, CWE-787
Updated
2026-11-02
OSVALPINE-CVE-2025-6663 7.8

GStreamer H266 Codec Parsing Stack-based Buffer Overflow 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 H266 sei messages. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-27381.

Record
ALPINE-CVE-2025-6663
CVSS 3.0
7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-03
OSV 7.8

GStreamer H266 Codec Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability

GStreamer H266 Codec Parsing Stack-based Buffer Overflow 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 H266 sei messages. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-27381.

Record
CVE-2025-6663
CVSS 3.0
7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-121
Updated
2026-11-02
OSVDEBIAN-CVE-2025-6663 7.8

GStreamer H266 Codec Parsing Stack-based Buffer Overflow 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 H266 sei messages. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-27381.

Record
DEBIAN-CVE-2025-6663
CVSS 3.0
7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2025-6663 7.8

GStreamer H266 Codec Parsing Stack-based Buffer Overflow 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 H266 sei messages. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-27381.

Record
UBUNTU-CVE-2025-6663
CVSS 3.0
7.8 HighCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
gst-plugins-bad
Alpine:v3.22
before 1.26.3-r0
1.26.3-r0
gst-plugins-bad
Alpine:v3.23
before 1.26.3-r0
1.26.3-r0
gst-plugins-bad
Alpine:v3.24
before 1.26.3-r0
1.26.3-r0
gst-plugins-bad1.0
Debian:13
before 1.26.2-3
1.26.2-3
gst-plugins-bad1.0
Debian:14
before 1.26.2-3
1.26.2-3
gst-plugins-bad1.0
Ubuntu:Pro:14.04:LTS
All versions, plus listed versions
1.2.0-3ubuntu51.2.1-1ubuntu11.2.1-1ubuntu21.2.2-1ubuntu11.2.2-1ubuntu2
Show 6 moreShow less
1.2.2-1ubuntu41.2.3-1ubuntu11.2.3-1ubuntu21.2.4-1~ubuntu11.2.4-1~ubuntu1.11.2.4-1~ubuntu1.1+esm1
None known
gst-plugins-bad1.0
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
1.6.0-1ubuntu11.6.1-1ubuntu11.6.2-1ubuntu11.7.1-1ubuntu11.7.1-1ubuntu3
Show 11 moreShow less
1.7.1-1ubuntu41.7.2-1ubuntu11.7.90-1ubuntu21.7.91-1ubuntu11.8.0-1ubuntu11.8.1-1ubuntu0.11.8.2-1ubuntu0.11.8.2-1ubuntu0.21.8.3-1ubuntu0.21.8.3-1ubuntu0.2+esm11.8.3-1ubuntu0.2+esm2
None known
gst-plugins-bad1.0
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
1.12.3-1ubuntu11.12.3-1ubuntu21.12.3-2ubuntu11.12.4-2ubuntu11.12.4-2ubuntu2
Show 8 moreShow less
1.13.1-1ubuntu11.13.91-1ubuntu11.14.0-1ubuntu11.14.1-1ubuntu1~ubuntu18.04.11.14.4-1ubuntu1~ubuntu18.04.11.14.5-0ubuntu1~18.04.11.14.5-0ubuntu1~18.04.1+esm11.14.5-0ubuntu1~18.04.1+esm2
None known
gst-plugins-bad1.0
Ubuntu:Pro:20.04:LTS
All versions, plus listed versions
1.16.1-1ubuntu11.16.1-1ubuntu31.16.1-1ubuntu41.16.1-1ubuntu51.16.1-1ubuntu6
Show 9 moreShow less
1.16.1-1ubuntu81.16.2-1ubuntu11.16.2-1ubuntu21.16.2-2ubuntu11.16.2-2.1ubuntu11.16.3-0ubuntu11.16.3-0ubuntu1.11.16.3-0ubuntu1.1+esm11.16.3-0ubuntu1.1+esm2
None known
gst-plugins-bad1.0
Ubuntu:Pro:22.04:LTS
All versions, plus listed versions
1.18.5-1ubuntu11.18.5-1ubuntu31.20.0-2ubuntu21.20.1-1ubuntu21.20.3-0ubuntu11.20.3-0ubuntu1.11.20.3-0ubuntu1.1+esm21.20.3-0ubuntu1.1+esm3
None known
gst-plugins-bad1.0
Ubuntu:Pro:24.04:LTS
All versions, plus listed versions
1.22.4-1ubuntu11.22.4-1ubuntu21.22.4-1ubuntu41.22.9-2ubuntu11.24.0-1ubuntu3
Show 4 moreShow less
1.24.0-1ubuntu41.24.2-1ubuntu41.24.2-1ubuntu4+esm11.24.2-1ubuntu4+esm2
None known

History

History
RecordedChangedSources
affected, aliases, referencesOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-6663 is a high vulnerability (CVSS 7.8) in Gstreamer, published July 7, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.39%, the 33rd percentile. Fixed in gst-plugins-bad 1.26.3-r0.

References

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