CVE-2023-39562Public exploit

Process crash via freed bitstream alignment

Published Aug 28, 2023 · Updated Oct 2, 2024

Heap use-after-free in GPAC 2.3-DEV-rev449-g5948e4f70-master allows attackers to crash MP4Box by supplying a crafted media file. During ISO media box parsing, gf_isom_box_parse_ex frees a temporary GF_BitStream, after which gf_bs_align reads the freed object while gf_bs_skip_bytes handles malformed box lengths. Opening the file with MP4Box and requesting XMT conversion triggers the abort; user interaction is required, and the demonstrated consequence is a process crash.

CVSS severity5.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap use-after-free in GPAC 2.3-DEV-rev449-g5948e4f70-master allows attackers to crash MP4Box by supplying a crafted media file. During ISO media box parsing, gf_isom_box_parse_ex frees a temporary GF_BitStream, after which gf_bs_align reads the freed object while gf_bs_skip_bytes handles malformed box lengths. Opening the file with MP4Box and requesting XMT conversion triggers the abort; user interaction is required, and the demonstrated consequence is a process crash.

The record

CVE
CVE-2023-39562
Published
Aug 28, 2023
Updated
Oct 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 2, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1203Exploitation for Client Execution

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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