EUVD-2026-39935
GHSA-h2mr-gm7g-c3gr
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
File must be opened by the user (AV:L, UI:R); no privileges needed to open a file (PR:N); impact is crash only with no confidentiality or integrity consequence (C:N, I:N, A:H).
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionCVE.org
A stack overflow in the AP4_Array<AP4_TrunAtom::Entry>::EnsureCapacity component of axiomatic-systems Bento4 before v1.8.9allows attackers to cause a Denial of Service (DoS) via a crafted MP4 file.
AnalysisAI
Stack overflow in Bento4's MP4 parsing component allows an attacker to crash any application built on the library by supplying a crafted MP4 file. The flaw resides in AP4_Array<AP4_TrunAtom::Entry>::EnsureCapacity, a dynamic array growth function invoked while processing Track Run (trun) atoms, and affects all Bento4 releases before v1.8.9. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to actively open a specially crafted MP4 file using an application that links against a vulnerable Bento4 build (before v1.8.9). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 5.5 (Medium) with vector AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H accurately reflects a constrained threat model: exploitation is local in the sense that the victim must open the file, no network service is exposed, and impact is limited to availability (crash). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malformed MP4 file with a trun atom engineered to trigger unbounded array growth in EnsureCapacity, then delivers it to a target user via email, download link, or shared network drive. When the victim opens the file using a Bento4-based application (such as MPC-BE or mp42aac), the stack overflows and the application crashes. … |
| Remediation | Upgrade Bento4 to v1.8.9 or later, as stated in the CVE description. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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