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GStreamer gst-plugins-good CVE-2026-73433

| EUVDEUVD-2026-57444 MEDIUM
Integer Underflow (CWE-191)
2026-08-12 redhat GHSA-cq86-v72j-qxrj
Information Disclosure Integer Overflow Buffer Overflow Denial Of Service Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9
6.6
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
6.6 HIGH
AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
vuln.today AI
7.6 HIGH

Network-deliverable file triggers parsing without auth (PR:N); user must open or preview the file (UI:R); OOB write yields I:L, heap disclosure C:L, crash A:H.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
SUSE
8.6 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Red Hat
6.6 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
High

Lifecycle Timeline

5
Patch available
Aug 12, 2026 - 23:03 EUVD
Severity Changed
Aug 12, 2026 - 21:22 NVD
HIGH MEDIUM
CVSS changed
Aug 12, 2026 - 21:22 NVD
7.6 (HIGH) 6.6 (MEDIUM)
Analysis Generated
Aug 12, 2026 - 19:53 vuln.today
CVE Published
Aug 12, 2026 - 19:05 cve.org
HIGH 7.6

DescriptionCVE.org

A flaw was found in GStreamer gst-plugins-good (avidemux). When parsing FUJIFILM metadata in an AVI strd chunk, gst_avi_demux_parse_strd() decrements a remaining-length counter by fixed offsets (98 and 10 bytes) without verifying sufficient data remains. For crafted strd payloads of exactly 106 or 107 bytes, the counter underflows to a very large unsigned value, causing subsequent null-terminated string scanning to read far beyond the allocated heap buffer. Date-format normalization may also write beyond the buffer end. Confirmed impacts include heap out-of-bounds read, out-of-bounds write, heap information disclosure (adjacent data appearing in parsed metadata), and application crash/denial of service. The avidemux element is auto-plugged by playbin, decodebin, and gst-discoverer, so opening or previewing a crafted AVI is sufficient to trigger the issue. Fixed upstream in gst-plugins-good 1.28.6 (GStreamer-SA-2026-0072).

AnalysisAI

Integer underflow in GStreamer's avidemux element allows a remote unauthenticated attacker to trigger heap out-of-bounds read and write, heap memory disclosure, and application crash by delivering a crafted AVI file containing a malformed FUJIFILM strd chunk. The gst_avi_demux_parse_strd() function decrements its remaining-length counter by fixed offsets without bounds checking, causing unsigned integer wraparound for payloads of exactly 106 or 107 bytes. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Craft AVI with 106/107-byte FUJIFILM strd
Delivery
Deliver file via email/web/share
Exploit
Victim previews or opens file
Install
avidemux auto-plugs via playbin/decodebin
C2
Counter underflows to large unsigned value
Execute
OOB heap read leaks adjacent memory
Impact
OOB write via date normalization
Step 8
Info disclosure and/or crash
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target system has gst-plugins-good installed with a version of gst-plugins-good prior to 1.28.6 and that the target user opens or previews a crafted AVI file. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 7.6 score (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H) accurately reflects the severity. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a malicious AVI file containing a FUJIFILM strd chunk of exactly 106 or 107 bytes and delivers it to a target user via email, web download, or a shared network drive. When the target previews the file in a GNOME file manager or opens it in any GStreamer-based media player, the avidemux element auto-plugs and gst_avi_demux_parse_strd() triggers the integer underflow, causing the process to read and potentially write beyond the heap buffer - leaking adjacent heap memory contents into parsed metadata and potentially crashing the application. …
Remediation The primary remediation is upgrading gst-plugins-good to version 1.28.6, which contains the upstream fix per GStreamer Security Advisory SA-2026-0072 (https://gstreamer.freedesktop.org/security/sa-2026-0072.html). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all systems running GStreamer and gst-plugins-good versions prior to 1.28.6, focusing on GNOME desktop environments and media processing infrastructure. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 16.0 Affected

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CVE-2026-73433 vulnerability details – vuln.today
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