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CVE-2026-12892

Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad: 1-byte heap out-of-bounds read in h.264 nal extension slice parser

4.4 MediumFix available

A flaw was found in GStreamer's gst-plugins-bad package. When processing a specially crafted H.264 video file containing malformed MVC or SVC extension slice NAL units, a 1-byte heap out-of-bounds read can occur during parsing. This happens when the parser attempts to check slice boundary information without first verifying that the NAL unit contains enough data beyond the extension header. An attacker could exploit this by tricking a user into opening a malicious H.264 video file, potentially causing the application to crash or leak a single byte of heap memory.

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
Low
Integrity
None
Availability
Low

Exploit likelihood

0.16%Unchanged since Jun 24, 2026
90%50%10%1%

What each source reports

CVE List Score used 4.4

Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad: 1-byte heap out-of-bounds read in h.264 nal extension slice parser

A flaw was found in GStreamer's gst-plugins-bad package. When processing a specially crafted H.264 video file containing malformed MVC or SVC extension slice NAL units, a 1-byte heap out-of-bounds read can occur during parsing. This happens when the parser attempts to check slice boundary information without first verifying that the NAL unit contains enough data beyond the extension header. An attacker could exploit this by tricking a user into opening a malicious H.264 video file, potentially causing the application to crash or leak a single byte of heap memory.

Record
CVE-2026-12892
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Weakness
CWE-125
Updated
2026-11-05
EUVDEUVD-2026-38607 4.4

A flaw was found in GStreamer's gst-plugins-bad package. When processing a specially crafted H.264 video file containing malformed MVC or SVC extension slice NAL units, a 1-byte heap out-of-bounds read can occur during parsing. This happens when the parser attempts to check slice boundary information without first verifying that the NAL unit contains enough data beyond the extension header. An attacker could exploit this by tricking a user into opening a malicious H.264 video file, potentially causing the application to crash or leak a single byte of heap memory.

Record
EUVD-2026-38607
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Updated
2026-11-05
GitHub AdvisoriesGHSA-mc62-3gf7-rphg 4.4

A flaw was found in GStreamer's gst-plugins-bad package. When processing a specially crafted H...

A flaw was found in GStreamer's gst-plugins-bad package. When processing a specially crafted H.264 video file containing malformed MVC or SVC extension slice NAL units, a 1-byte heap out-of-bounds read can occur during parsing. This happens when the parser attempts to check slice boundary information without first verifying that the NAL unit contains enough data beyond the extension header. An attacker could exploit this by tricking a user into opening a malicious H.264 video file, potentially causing the application to crash or leak a single byte of heap memory.

Record
GHSA-mc62-3gf7-rphg
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Weakness
CWE-125
Updated
2026-11-02
NVD 4.4

A flaw was found in GStreamer's gst-plugins-bad package. When processing a specially crafted H.264 video file containing malformed MVC or SVC extension slice NAL units, a 1-byte heap out-of-bounds read can occur during parsing. This happens when the parser attempts to check slice boundary information without first verifying that the NAL unit contains enough data beyond the extension header. An attacker could exploit this by tricking a user into opening a malicious H.264 video file, potentially causing the application to crash or leak a single byte of heap memory.

Record
CVE-2026-12892
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Weakness
CWE-125
Updated
2026-11-05
OSVDEBIAN-CVE-2026-12892 4.4

A flaw was found in GStreamer's gst-plugins-bad package. When processing a specially crafted H.264 video file containing malformed MVC or SVC extension slice NAL units, a 1-byte heap out-of-bounds read can occur during parsing. This happens when the parser attempts to check slice boundary information without first verifying that the NAL unit contains enough data beyond the extension header. An attacker could exploit this by tricking a user into opening a malicious H.264 video file, potentially causing the application to crash or leak a single byte of heap memory.

Record
DEBIAN-CVE-2026-12892
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Updated
2026-11-02
OSVUBUNTU-CVE-2026-12892 4.4

A flaw was found in GStreamer's gst-plugins-bad package. When processing a specially crafted H.264 video file containing malformed MVC or SVC extension slice NAL units, a 1-byte heap out-of-bounds read can occur during parsing. This happens when the parser attempts to check slice boundary information without first verifying that the NAL unit contains enough data beyond the extension header. An attacker could exploit this by tricking a user into opening a malicious H.264 video file, potentially causing the application to crash or leak a single byte of heap memory.

Record
UBUNTU-CVE-2026-12892
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Updated
2026-11-02
Show 7 moreShow less
OSVopenSUSE-SU-2026:21370-1 No score

Security update for gstreamer-plugins-bad

This update for gstreamer-plugins-bad fixes the following issues

  • CVE-2026-12891: unchecked aspect_ratio_idc value used as an array index in the H.266 parser could cause a global out- of-bounds read (bsc#1268872).
  • CVE-2026-12892: 1-byte heap out-of-bounds read in H.264 NAL extension slice parser (bsc#1268971).
  • CVE-2026-14935: webrtcbin accepts remote SDP without a=fingerprint due to inverted presence check (bsc#1271051).
  • CVE-2026-52720: invalid check of total area instead of individual dimensions could trigger a heap out-of-bounds write (bsc#1268406).
  • CVE-2026-52721: crafted PCAP records during IPv4 or TCP header parsing could cause an out-of-bounds read (bsc#1268408).
  • CVE-2026-52722: crafted VMnc stream with large cursor dimensions can overflow signed integer (bsc#1268410).
  • CVE-2026-53701: multi-slice-in-tile partitions without slice index bounds checks could trigger an out-of-bounds write (bsc#1268172).
  • CVE-2026-53702: incorrect loop bound during H.265 SEI message parsing could result in a stack buffer overflow (bsc#1268168).
  • CVE-2026-59692: unvalidated peer certificate Subject DN printed during a DTLS handshake could cause a stack buffer overflow (bsc#1271168).
Record
openSUSE-SU-2026:21370-1
Updated
2026-11-02
OSVSUSE-SU-2026:22752-1 No score

Security update for gstreamer-plugins-bad

This update for gstreamer-plugins-bad fixes the following issues

  • CVE-2026-12891: unchecked aspect_ratio_idc value used as an array index in the H.266 parser could cause a global out- of-bounds read (bsc#1268872).
  • CVE-2026-12892: 1-byte heap out-of-bounds read in H.264 NAL extension slice parser (bsc#1268971).
  • CVE-2026-14935: webrtcbin accepts remote SDP without a=fingerprint due to inverted presence check (bsc#1271051).
  • CVE-2026-52720: invalid check of total area instead of individual dimensions could trigger a heap out-of-bounds write (bsc#1268406).
  • CVE-2026-52721: crafted PCAP records during IPv4 or TCP header parsing could cause an out-of-bounds read (bsc#1268408).
  • CVE-2026-52722: crafted VMnc stream with large cursor dimensions can overflow signed integer (bsc#1268410).
  • CVE-2026-53701: multi-slice-in-tile partitions without slice index bounds checks could trigger an out-of-bounds write (bsc#1268172).
  • CVE-2026-53702: incorrect loop bound during H.265 SEI message parsing could result in a stack buffer overflow (bsc#1268168).
  • CVE-2026-59692: unvalidated peer certificate Subject DN printed during a DTLS handshake could cause a stack buffer overflow (bsc#1271168).
Record
SUSE-SU-2026:22752-1
Updated
2026-11-02
OSVSUSE-SU-2026:22817-1 No score

Security update for gstreamer-plugins-bad

This update for gstreamer-plugins-bad fixes the following issues

  • CVE-2026-12891: unchecked aspect_ratio_idc value used as an array index in the H.266 parser could cause a global out- of-bounds read (bsc#1268872).
  • CVE-2026-12892: 1-byte heap out-of-bounds read in H.264 NAL extension slice parser (bsc#1268971).
  • CVE-2026-14935: webrtcbin accepts remote SDP without a=fingerprint due to inverted presence check (bsc#1271051).
  • CVE-2026-52720: invalid check of total area instead of individual dimensions could trigger a heap out-of-bounds write (bsc#1268406).
  • CVE-2026-52721: crafted PCAP records during IPv4 or TCP header parsing could cause an out-of-bounds read (bsc#1268408).
  • CVE-2026-52722: crafted VMnc stream with large cursor dimensions can overflow signed integer (bsc#1268410).
  • CVE-2026-53701: multi-slice-in-tile partitions without slice index bounds checks could trigger an out-of-bounds write (bsc#1268172).
  • CVE-2026-53702: incorrect loop bound during H.265 SEI message parsing could result in a stack buffer overflow (bsc#1268168).
  • CVE-2026-59692: unvalidated peer certificate Subject DN printed during a DTLS handshake could cause a stack buffer overflow (bsc#1271168).
Record
SUSE-SU-2026:22817-1
Updated
2026-11-02
OSVSUSE-SU-2026:3058-1 No score

Security update for gstreamer-plugins-bad

This update for gstreamer-plugins-bad fixes the following issues

  • CVE-2026-12892: 1-byte heap out-of-bounds read in H.264 NAL extension slice parser (bsc#1268971).
  • CVE-2026-14935: webrtcbin accepts remote SDP without a=fingerprint due to inverted presence check (bsc#1271051).
  • CVE-2026-52720: invalid check of total area instead of individual dimensions could trigger a heap out-of-bounds write (bsc#1268406).
  • CVE-2026-52721: crafted PCAP records during IPv4 or TCP header parsing could cause an out-of-bounds read (bsc#1268408).
  • CVE-2026-52722: crafted VMnc stream with large cursor dimensions can overflow signed integer (bsc#1268410).
  • CVE-2026-53702: incorrect loop bound during H.265 SEI message parsing could result in a stack buffer overflow (bsc#1268168).
  • CVE-2026-59692: unvalidated peer certificate Subject DN printed during a DTLS handshake could cause a stack buffer overflow (bsc#1271168).
Record
SUSE-SU-2026:3058-1
Updated
2026-11-02
OSVSUSE-SU-2026:3125-1 No score

Security update for gstreamer-plugins-bad

This update for gstreamer-plugins-bad fixes the following issues:

  • CVE-2026-12892: 1-byte heap out-of-bounds read in H.264 NAL extension slice parser (bsc#1268971).
  • CVE-2026-14935: webrtcbin accepts remote SDP without a=fingerprint due to inverted presence check (bsc#1271051).
  • CVE-2026-52720: invalid check of total area instead of individual dimensions could trigger a heap out-of-bounds write (bsc#1268406).
  • CVE-2026-52721: crafted PCAP records during IPv4 or TCP header parsing could cause an out-of-bounds read (bsc#1268408).
  • CVE-2026-52722: crafted VMnc stream with large cursor dimensions can overflow signed integer (bsc#1268410).
  • CVE-2026-53702: incorrect loop bound during H.265 SEI message parsing could result in a stack buffer overflow (bsc#1268168).
  • CVE-2026-59692: unvalidated peer certificate Subject DN printed during a DTLS handshake could cause a stack buffer overflow (bsc#1271168).
Record
SUSE-SU-2026:3125-1
Updated
2026-11-02
OSVSUSE-SU-2026:3133-1 No score

Security update for gstreamer-plugins-bad

This update for gstreamer-plugins-bad fixes the following issues

  • CVE-2026-12892: 1-byte heap out-of-bounds read in H.264 NAL extension slice parser (bsc#1268971).
  • CVE-2026-14935: webrtcbin accepts remote SDP without a=fingerprint due to inverted presence check (bsc#1271051).
  • CVE-2026-52720: invalid check of total area instead of individual dimensions could trigger a heap out-of-bounds write (bsc#1268406).
  • CVE-2026-52721: crafted PCAP records during IPv4 or TCP header parsing could cause an out-of-bounds read (bsc#1268408).
  • CVE-2026-52722: crafted VMnc stream with large cursor dimensions can overflow signed integer (bsc#1268410).
  • CVE-2026-53702: incorrect loop bound during H.265 SEI message parsing could result in a stack buffer overflow (bsc#1268168).
  • CVE-2026-59692: unvalidated peer certificate Subject DN printed during a DTLS handshake could cause a stack buffer overflow (bsc#1271168).
Record
SUSE-SU-2026:3133-1
Updated
2026-11-02
OSVSUSE-SU-2026:3299-1 No score

Security update for gstreamer-plugins-bad

This update for gstreamer-plugins-bad fixes the following issues:

  • CVE-2026-12892: 1-byte heap out-of-bounds read in H.264 NAL extension slice parser (bsc#1268971).
  • CVE-2026-52720: invalid check of total area instead of individual dimensions could trigger a heap out-of-bounds write (bsc#1268406).
  • CVE-2026-52721: crafted PCAP records during IPv4 or TCP header parsing could cause an out-of-bounds read (bsc#1268408).
  • CVE-2026-52722: crafted VMnc stream with large cursor dimensions can overflow signed integer payload-size arithmetic (bsc#1268410).
  • CVE-2026-53702: incorrect loop bound during H.265 SEI message parsing could result in a stack buffer overflow (bsc#1268168).
  • CVE-2026-59692: unvalidated peer certificate Subject DN printed during a DTLS handshake could cause a stack buffer overflow (bsc#1271168).
Record
SUSE-SU-2026:3299-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
gst-plugins-bad1.0
Debian:12
 before 1.22.0-4+deb12u8, plus listed versions
1.22.0-41.22.0-4+deb12u11.22.0-4+deb12u21.22.0-4+deb12u31.22.0-4+deb12u41.22.0-4+deb12u51.22.0-4+deb12u61.22.0-4+deb12u7
1.22.0-4+deb12u8
gst-plugins-bad1.0
Debian:13
 before 1.26.2-3+deb13u3, plus listed versions
1.26.2-31.26.2-3+deb13u11.26.2-3+deb13u2
1.26.2-3+deb13u3
gst-plugins-bad1.0
Debian:14
 before 1.28.5-1, plus listed versions
1.26.10-11.26.10-21.26.2-31.26.3-11.26.4-1
Show 25 moreShow less
1.26.5-11.26.5-21.26.6-11.26.6-21.26.6-31.26.6-41.26.6-51.26.7-11.26.7-21.26.8-11.26.9-11.27.1-11.27.2-11.27.50-11.27.90-11.27.90-21.27.90-31.28.0-11.28.1-11.28.1-21.28.1-31.28.2-11.28.2-21.28.3-11.28.4-1
1.28.5-1
gstreamer-plugins-bad
SUSE:Linux Micro 6.2
From an advisory covering 9 CVEs
 before 1.26.7-160000.3.1
1.26.7-160000.3.1
gstreamer-plugins-bad
SUSE:Linux Enterprise Server 16.0
From an advisory covering 9 CVEs
 before 1.26.7-160000.3.1
1.26.7-160000.3.1
gstreamer-plugins-bad
SUSE:Linux Enterprise Server for SAP applications 16.0
From an advisory covering 9 CVEs
 before 1.26.7-160000.3.1
1.26.7-160000.3.1
gstreamer-plugins-bad
SUSE:Linux Enterprise Module for Basesystem 15 SP7
From an advisory covering 7 CVEs
 before 1.24.0-150600.4.9.1
1.24.0-150600.4.9.1
gstreamer-plugins-bad
SUSE:Linux Enterprise Module for Desktop Applications 15 SP7
From an advisory covering 7 CVEs
 before 1.24.0-150600.4.9.1
1.24.0-150600.4.9.1
gstreamer-plugins-bad
SUSE:Linux Enterprise Module for Package Hub 15 SP7
From an advisory covering 7 CVEs
 before 1.24.0-150600.4.9.1
1.24.0-150600.4.9.1
gstreamer-plugins-bad
SUSE:Linux Enterprise Server 15 SP6-LTSS
From an advisory covering 7 CVEs
 before 1.24.0-150600.4.9.1
1.24.0-150600.4.9.1
Show 21 moreShow less
Affected packages
PackageAffectedFixed
gstreamer-plugins-bad
SUSE:Linux Enterprise Server for SAP Applications 15 SP6
From an advisory covering 7 CVEs
 before 1.24.0-150600.4.9.1
1.24.0-150600.4.9.1
gstreamer-plugins-bad
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS
From an advisory covering 7 CVEs
 before 1.22.0-150500.3.34.1
1.22.0-150500.3.34.1
gstreamer-plugins-bad
SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS
From an advisory covering 7 CVEs
 before 1.22.0-150500.3.34.1
1.22.0-150500.3.34.1
gstreamer-plugins-bad
SUSE:Linux Enterprise Server 15 SP5-LTSS
From an advisory covering 7 CVEs
 before 1.22.0-150500.3.34.1
1.22.0-150500.3.34.1
gstreamer-plugins-bad
SUSE:Linux Enterprise Server for SAP Applications 15 SP5
From an advisory covering 7 CVEs
 before 1.22.0-150500.3.34.1
1.22.0-150500.3.34.1
gstreamer-plugins-bad
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS
From an advisory covering 7 CVEs
 before 1.20.1-150400.3.29.1
1.20.1-150400.3.29.1
gstreamer-plugins-bad
SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS
From an advisory covering 7 CVEs
 before 1.20.1-150400.3.29.1
1.20.1-150400.3.29.1
gstreamer-plugins-bad
SUSE:Linux Enterprise Server 15 SP4-LTSS
From an advisory covering 7 CVEs
 before 1.20.1-150400.3.29.1
1.20.1-150400.3.29.1
gstreamer-plugins-bad
SUSE:Linux Enterprise Server for SAP Applications 15 SP4
From an advisory covering 7 CVEs
 before 1.20.1-150400.3.29.1
1.20.1-150400.3.29.1
gstreamer-plugins-bad
SUSE:Linux Enterprise Server 12 SP5-LTSS
From an advisory covering 6 CVEs
 before 1.8.3-18.21.1
1.8.3-18.21.1
gstreamer-plugins-bad
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5
From an advisory covering 6 CVEs
 before 1.8.3-18.21.1
1.8.3-18.21.1
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
gst-plugins-bad1.0
Ubuntu:25.10
 All versions, plus listed versions
1.26.0-1ubuntu21.26.2-1ubuntu11.26.3-1ubuntu11.26.4-1ubuntu11.26.5-1ubuntu2
 None known
gst-plugins-bad1.0
Ubuntu:26.10
 All versions, plus listed versions
1.28.2-1ubuntu11.28.2-1ubuntu21.28.4-1ubuntu11.28.4-1ubuntu21.28.6-1ubuntu1
 None known
gst-plugins-bad1.0
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.26.5-1ubuntu21.27.2-1ubuntu11.27.90-1ubuntu21.28.0-1ubuntu21.28.1-2ubuntu2
Show 4 moreShow less
1.28.1-2ubuntu31.28.2-1ubuntu11.28.2-1ubuntu1.11.28.2-1ubuntu1.2
 None known
gstreamer-plugins-bad
openSUSE:Leap 16.0
From an advisory covering 9 CVEs
 before 1.26.7-160000.3.1
1.26.7-160000.3.1

History

History
RecordedChangedSources
affected
referencesCVE List, NVD
factsEUVD
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

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

In short

CVE-2026-12892 is a medium vulnerability (CVSS 4.4) in Gstreamer, published June 23, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.16%, the 4th percentile. Fixed in gst-plugins-bad1.0 1.22.0-4+deb12u8.

References

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