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GPAC MP4Box EUVDEUVD-2026-42590

| CVE-2026-15185 LOW
Out-of-bounds Read (CWE-125)
2026-07-09 VulDB GHSA-fp8c-v4q6-8572
Buffer Overflow Information Disclosure Gpac
1.9
CVSS 4.0 · Vendor: VulDB

Severity by source

Vendor (VulDB) PRIMARY
1.9 MEDIUM
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/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
3.3 LOW

Local attack vector with low privileges to supply crafted input; only low availability impact, no confidentiality or integrity loss, no scope change.

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

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/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
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Severity Changed
Jul 09, 2026 - 14:22 NVD
MEDIUM LOW
CVSS changed
Jul 09, 2026 - 14:22 NVD
4.8 (MEDIUM) 1.9 (LOW)
Analysis Generated
Jul 09, 2026 - 13:56 vuln.today

DescriptionCVE.org

A vulnerability was determined in GPAC 26.03-DEV. This affects the function vobsub_read_idx of the file /src/media_tools/vobsub.c of the component MP4Box. Executing a manipulation of the argument num_langs can lead to out-of-bounds read. The attack needs to be launched locally. The exploit has been publicly disclosed and may be utilized. This patch is called 532097084729a936bcdf6a27c41003f3bd7dc3ff. It is best practice to apply a patch to resolve this issue. Two different commits were applied to fix this issue.

AnalysisAI

Out-of-bounds read in GPAC MP4Box version 26.03-DEV allows local low-privileged attackers to cause a low-severity availability impact by supplying a crafted input that manipulates the num_langs argument in the vobsub_read_idx function of vobsub.c. A proof-of-concept exploit has been publicly disclosed via GitHub issue #3611 and the CVSS 4.0 E:P modifier confirms its availability. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Gain local low-privilege access
Delivery
Place crafted VobSub .idx file on system
Exploit
Invoke MP4Box against crafted file
Execution
vobsub_read_idx reads out-of-bounds on num_langs
Impact
MP4Box process crashes
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Vulnerability AssessmentAI

Exploitation Exploitation requires local access to the system and low-privilege execution rights (PR:L per CVSS 4.0). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 4.8 (Medium) reflects a realistic and appropriately calibrated risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A local attacker with low privileges places a crafted VobSub subtitle index file containing an out-of-range `num_langs` value on the target system, then invokes `MP4Box` to process it - for example, as part of an automated media transcoding pipeline that processes user-uploaded subtitle files. The `vobsub_read_idx` function reads beyond the intended buffer boundary, causing MP4Box to crash (availability impact). …
Remediation Apply the two upstream patch commits directly to the GPAC source tree: `532097084729a936bcdf6a27c41003f3bd7dc3ff` and `aa0fb77b82e51b159a2024c440cdf6b571b14d81`, both available at https://github.com/gpac/gpac/. … Detailed patch versions, workarounds, and compensating controls in full report.
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Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-42590 vulnerability details – vuln.today
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