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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

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

Vulnerability Assessment

Weakness
CWE
CWE-191
ASVS 5.0
V15 - Secure Coding and Architecture Integer underflow checks
Exploitation Conditions

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. No authentication, network connectivity to the attacker, or special system configuration is required on the victim side - only the act of accessing a malicious file. The auto-plug behavior of playbin, decodebin, and gst-discoverer means file preview (e.g., hovering over a file in GNOME Files with thumbnailing enabled, or passing a file to gst-discoverer for metadata inspection) is sufficient - explicit media playback is not required. The trigger is highly specific to the payload size (exactly 106 or 107 bytes for the strd chunk), which limits opportunistic mass exploitation but is not a meaningful obstacle for targeted delivery. Exploitation is limited to systems running a GStreamer-based media stack (primarily Linux desktop and embedded Linux environments); macOS and Windows systems using alternative media frameworks are not affected unless they independently ship gst-plugins-good.
Impact

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. Attack complexity is low - the trigger condition (106 or 107-byte strd payload) is a precise but trivially constructible byte count, not a timing or race condition. The UI:R requirement is somewhat mitigated by the auto-plug behavior: gst-discoverer and thumbnail renderers used by file managers can trigger parsing without the user explicitly launching a media player, blurring the line between active user interaction and passive file preview. The C:L (heap information disclosure via adjacent memory in parsed metadata) and I:L (potential OOB write via date-format normalization) signals indicate this is not a pure DoS - memory leakage and potential controlled write do exist. No EPSS score was provided in the input data; without it, probability of exploitation must be inferred from structural signals. The absence of both a CISA KEV entry and any reported POC suggests exploitation has not been weaponized publicly at time of analysis. However, the low attack complexity, wide deployment surface of GStreamer in Linux desktop and embedded environments, and the auto-plug behavior elevate real-world risk above a typical UI:R finding. This is a genuine patching priority, not merely a paper score.
Exploit ScenarioDerived

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. No public exploit code has been identified at time of analysis, but the precise trigger byte count and low attack complexity make independent construction straightforward.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Aug 12, 2026

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. Because avidemux is auto-plugged by GStreamer's high-level components (playbin, decodebin, gst-discoverer), any application that opens or previews a media file - including GNOME Files, Nautilus, Totem, and many others - can trigger the vulnerability without user awareness. No public exploit or active exploitation (CISA KEV) has been identified at time of analysis; a vendor-released patch is available in gst-plugins-good 1.28.6.

RemediationAI

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). The upstream fix is also tracked via GitLab merge request https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/12231. Red Hat customers should apply the updated gstreamer1-plugins-good RPM once released via RHSA, tracking the issue at https://bugzilla.redhat.com/show_bug.cgi?id=2514801 and https://access.redhat.com/security/cve/CVE-2026-73433. If an immediate upgrade is not possible, a targeted workaround is to prevent the avidemux element from being auto-plugged by removing or disabling the gstreamer1-plugins-good package - this will impact AVI file playback and MJPEG support but eliminates the attack surface. Alternatively, restricting untrusted AVI file access in file managers (disabling thumbnail generation for video files in GNOME Files/Nautilus) reduces passive trigger risk, though it does not prevent explicit media player usage. Do not rely on network perimeter controls alone, as the file can be delivered via web download, email attachment, or shared storage.

Affected VersionsENISA

gst-plugins-good 0 <1.28.6

Affected Packages

euvd gst_plugins_good fix: 1.28.6

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Technical ContextAI · show details

The vulnerability resides in gst_avi_demux_parse_strd() within gst-plugins-good's AVI demuxer element, which processes stream format ('strd') chunks embedded in AVI container files. When parsing FUJIFILM-specific metadata headers, the function unconditionally subtracts first 98, then 10 bytes from an unsigned remaining-length counter. For strd payloads of exactly 106 or 107 bytes, these subtractions cause the counter to underflow to a very large 32-bit unsigned value (CWE-191: Integer Underflow). The inflated counter then permits subsequent null-terminated string scanning and date-format normalization to read and write far beyond the allocated heap buffer boundaries. CWE-191 (Integer Underflow) is the root cause; the secondary effects are CWE-125 (Out-of-Bounds Read) and CWE-787 (Out-of-Bounds Write). Affected CPE targets include cpe:2.3:a:red_hat:red_hat_enterprise_linux_7/8/9/10, reflecting GStreamer package delivery through Red Hat's ecosystem, though the upstream flaw is in the freedesktop.org gst-plugins-good source tree. The CVSS vector AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H reflects that the file can be delivered over the network, exploitation conditions are low-complexity, no authentication is required, but user interaction (opening or previewing a file) is necessary.

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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

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
High

Lifecycle Timeline

4
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)
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).

Executive ViewAI

Why It Matters

GStreamer's media preview functionality in GNOME desktop applications is vulnerable to crashes and data leaks through specially crafted AVI files, impacting end-user productivity and data security. No active attacks have been identified to date. The vulnerability affects any system where users open or preview media files using built-in or default applications.

Business Impact: High
Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score
0.1%
Top 97% exploitable
Prevalence
High
dominant multimedia framework across Linux desktop and embedded Linux deployments
Data Quality
7 sources
Confidence: High
EUVD NVD CVE.org EPSS Vulnrichment Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.1%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision
Scheduled
Exploitation
None
System Exposure· derived
Small
Automatable
No
Human Impact
High
Technical Impact
Partial

Priority Score

33
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +33
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Integer Overflow MEDIUM

Integer overflow occurs when an arithmetic operation produces a result that exceeds the maximum value a given integer type can store.

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

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Same weakness CWE-191 – Integer Underflow

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Same technique Buffer Overflow

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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

References

Advisories & patches
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-73433 ADVISORY https://ubuntu.com/security/notices/USN-8863-1 ADVISORY https://vuldb.com/vuln/389254 REF https://access.redhat.com/errata/RHSA-2026:55434 REF https://access.redhat.com/errata/RHSA-2026:55436 REF https://access.redhat.com/errata/RHSA-2026:56966 REF https://access.redhat.com/errata/RHSA-2026:65959 REF https://access.redhat.com/errata/RHSA-2026:68642 REF https://access.redhat.com/errata/RHSA-2026:68644 REF https://access.redhat.com/errata/RHSA-2026:68645 REF https://access.redhat.com/errata/RHSA-2026:69232 REF https://access.redhat.com/errata/RHSA-2026:70264 REF https://access.redhat.com/errata/RHSA-2026:70584 REF https://access.redhat.com/errata/RHSA-2026:70803 REF https://access.redhat.com/security/cve/CVE-2026-73433 REF https://bugzilla.redhat.com/show_bug.cgi?id=2514801 REF https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/12231 REF https://gstreamer.freedesktop.org/security/sa-2026-0072.html

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