---
id: CVE-2026-70351
title: >-
  Integer overflow or wraparound in Microsoft WebP Image Extension allows an
  unauthorized attacker to execute code over a network.
summary: >-
  Integer overflow or wraparound in Microsoft WebP Image Extension allows an
  unauthorized attacker to execute code over a network.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-122
  - CWE-190
vendor: microsoft
product: webp_image_extension
affected:
  - webp_image_extension < 1.2.31.0
patched:
  - webp_image_extension 1.2.31.0
published: '2026-09-08'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T19:47:02.153'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-70351'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70351'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-09T18:19:09.759400Z'
epss: 0.00819
epssPercentile: 0.57007
ingestedAt: '2026-09-08T19:08:49.622Z'
---

## Overview

Integer overflow or wraparound in Microsoft WebP Image Extension allows an unauthorized attacker to execute code over a network.

## Affected

- `webp_image_extension < 1.2.31.0`

## Remediation

Upgrade past the affected range:

- `webp_image_extension 1.2.31.0`