CVE-2026-95121

Code execution via unchecked RTP offset subtraction

Published Oct 13, 2026 · Updated Oct 13, 2026

Integer underflow in TechSmith MP4v2 2.0.0 RTP parsing allows attackers to execute arbitrary code via a crafted MP4 file. MP4RtpAtom::ReadHntiType() in src/atom_rtp.cpp subtracts the current file position from the atom end without checking their order, producing a near-2^64 allocation size for an undersized atom. A consuming application must parse the file; the supplied record reports code execution, but public exploitability details and version applicability remain unverified.

CVSS severityUnavailable
Unscored
EPSS probability0.14%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in TechSmith MP4v2 2.0.0 RTP parsing allows attackers to execute arbitrary code via a crafted MP4 file. MP4RtpAtom::ReadHntiType() in src/atom_rtp.cpp subtracts the current file position from the atom end without checking their order, producing a near-2^64 allocation size for an undersized atom. A consuming application must parse the file; the supplied record reports code execution, but public exploitability details and version applicability remain unverified.

The record

CVE
CVE-2026-95121
Published
Oct 13, 2026
Updated
Oct 13, 2026
Vendor
TechSmith
Product
MP4v2
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 13, 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=n/a

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

TechSmith · MP4v2version=n/a

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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