High severity · published Sep 8, 2026
CVE-2026-70351
Microsoft WebP Image Extension Remote Code Execution Vulnerability
8.8
CVSS
0.8%
EPSS
No
On KEV
Description
Integer overflow or wraparound in Microsoft WebP Image 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)0.8% · higher than 57% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WI
WebP Image Extension · Microsoft
1.0.0.0 before 1.2.31.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-70351
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-70351
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70351
More from WebP Image Extension
8.8
CVE-2023-4863
Google Chromium WebP Heap-Based Buffer Overflow Vulnerability
5.5
CVE-2020-17102
WebP Image Extensions Information Disclosure Vulnerability