CVE-2023-4756Public exploit

Crash via recursive blank-line parsing

Published Sep 4, 2023 · Updated Sep 19, 2024

Stack-based buffer overflow in GPAC before 2.3-DEV allows local users to crash MP4Box by processing a crafted scene file. The gf_bt_check_line function in src/scene_manager/loader_bt.c recursively reloads empty lines without bounding recursion, exhausting the process stack. Triggering requires MP4Box to process attacker-supplied BT/X3D scene content, and the demonstrated consequence is an application crash.

CVSS severity5.9
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in GPAC before 2.3-DEV allows local users to crash MP4Box by processing a crafted scene file. The gf_bt_check_line function in src/scene_manager/loader_bt.c recursively reloads empty lines without bounding recursion, exhausting the process stack. Triggering requires MP4Box to process attacker-supplied BT/X3D scene content, and the demonstrated consequence is an application crash.

The record

CVE
CVE-2023-4756
Published
Sep 4, 2023
Updated
Sep 19, 2024
Vendor
GPAC Project
Product
GPAC
Classifications
CWE-787, CWE-121, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <2.3-DEV

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

GPAC Project · GPACversion=unspecified <2.3-DEV

Published CVSS scores

5.9huntr.devCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-121Stack-based Buffer Overflow
T1204.002User Execution: Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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