CVE-2026-7135Public exploit

Local crash via truncated extended-language box size

Published Apr 27, 2026 · Updated Apr 27, 2026

Out-of-bounds access in GPAC MP4Box 26.03-DEV-rev105-g8f39a1eb3-master allows local users to crash MP4Box via a crafted MP4 file. In elng_box_read, a 64-bit elng payload size is cast to 32 bits for allocation and reading, then reused untruncated as a heap index. A local user must supply a Linux sparse file whose logical size passes the parser guard; the demonstrated consequence is an immediate process crash.

CVSS severity5.3
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in GPAC MP4Box 26.03-DEV-rev105-g8f39a1eb3-master allows local users to crash MP4Box via a crafted MP4 file. In elng_box_read, a 64-bit elng payload size is cast to 32 bits for allocation and reading, then reused untruncated as a heap index. A local user must supply a Linux sparse file whose logical size passes the parser guard; the demonstrated consequence is an immediate process crash.

The record

CVE
CVE-2026-7135
Published
Apr 27, 2026
Updated
Apr 27, 2026
Vendor
GPAC Project
Product
GPAC
Classifications
CWE-119, CWE-125, T1203
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=26.03-DEV-rev105-g8f39a1eb3-master

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

GPAC Project · GPACversion=26.03-DEV-rev105-g8f39a1eb3-master

Published CVSS scores

4.3VulDBAV:L/AC:L/Au:S/C:P/I:P/A:P
1.9VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
5.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-125Out-of-bounds Read
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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