Code execution via undisclosed integer overflow
Published Sep 8, 2026 · Updated Sep 9, 2026
Integer overflow in Microsoft WebP Image Extension before 1.2.31.0 allows remote attackers to execute code through a malicious WebP image. The public record does not identify the decoder routine or integer operation; it states only that wraparound leads to a heap-based buffer overflow. Exploitation requires a user to cause an application to process the image, and successful exploitation runs code in that application's context.
Summary
What happened
Integer overflow in Microsoft WebP Image Extension before 1.2.31.0 allows remote attackers to execute code through a malicious WebP image. The public record does not identify the decoder routine or integer operation; it states only that wraparound leads to a heap-based buffer overflow. Exploitation requires a user to cause an application to process the image, and successful exploitation runs code in that application's context.
The record
- CVE
- CVE-2026-70351
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- WebP Image Extension
- Classifications
- CWE-122, CWE-190, T1203, T1204.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 9, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.0.0.0 <1.2.31.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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