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GPAC CVE-2026-91086

| EUVDEUVD-2026-78301 LOW
Heap-based Buffer Overflow (CWE-122)
2026-09-15 VulDB GHSA-39g2-989c-6gxv
Buffer Overflow Heap Overflow Gpac N A
2.1
CVSS 4.0 · Vendor: VulDB

Severity by source

Vendor (VulDB) PRIMARY
2.1 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
6.3 MEDIUM

Remote delivery of malicious media file requires user interaction (UI:R); heap overflow yields limited C/I/A impact at user privilege level with unchanged scope.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

5
Source Code Evidence Fetched
Sep 15, 2026 - 07:32 vuln.today
Analysis Generated
Sep 15, 2026 - 07:32 vuln.today
Severity Changed
Sep 15, 2026 - 07:22 NVD
MEDIUM LOW
CVSS changed
Sep 15, 2026 - 07:22 NVD
5.3 (MEDIUM) 2.1 (LOW)
CVE Published
Sep 15, 2026 - 06:30 cve.org
LOW 2.1

DescriptionCVE.org

A security vulnerability has been detected in GPAC up to f1219cde. Affected by this issue is the function mpgviddmx_process of the file filters/reframe_mpgvid.c of the component MPEG Video Reframer. Such manipulation leads to heap-based buffer overflow. The attack can be executed remotely. The exploit has been disclosed publicly and may be used. Upgrading to version abi-16.23 can resolve this issue. The name of the patch is afca1f1181668d85941d51ed1adf647807d5d975. Upgrading the affected component is recommended.

AnalysisAI

Heap-based buffer overflow in GPAC's MPEG Video Reframer filter exposes users of versions up to commit f1219cde to memory corruption when processing a malformed MPEG video file. The vulnerable function mpgviddmx_process() in filters/reframe_mpgvid.c previously relied on gf_assert() to validate MPEG start codes without first confirming the buffer contains at least 3 bytes, enabling heap corruption on crafted input. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Delivery
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Execution
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Persist
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Vulnerability AssessmentAI

Exploitation Exploitation requires a user or automated pipeline to open or process a specially crafted MPEG video file using GPAC at or before commit f1219cde, specifically routing the file through the MPEG Video Reframer filter (mpgviddmx_process in filters/reframe_mpgvid.c). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 2.1 (AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L) is notably conservative for a heap overflow - the depressed score is driven primarily by the passive user interaction gate (UI:P) and the low C/I/A impact ratings. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade GPAC to release abi-16.23, available at github.com/gpac/gpac/releases/tag/abi-16.23. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-91086 vulnerability details – vuln.today
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