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High severity · published Oct 13, 2026
CVE-2026-70343
Microsoft MPEG-2 Video Extension Remote Code Execution Vulnerability
8.8
CVSS
0.9%
EPSS
No
On KEV
Description
Heap-based buffer overflow in Microsoft MPEG-2 Video Extension allows an unauthorized attacker to execute code over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 60% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MV
MPEG-2 Video Extension · Microsoft
1.0.0.0 before 1.2.32.0 · source: vendor
Affected product
MV
MPEG-2 Video Extension
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-70343
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-70343
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70343
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