EUVD-2026-73078
GHSA-j24m-jgmw-jc5f
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network-delivered malicious image requires only user file-open interaction; no attacker privileges or special conditions needed beyond extension installation.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Integer overflow or wraparound in Microsoft WebP Image Extension allows an unauthorized attacker to execute code over a network.
AnalysisAI
Heap-based buffer overflow in Microsoft WebP Image Extension versions prior to 1.2.31.0 enables remote code execution when a victim opens a specially crafted WebP image file. The root trigger is an integer overflow (CWE-190) that corrupts heap allocation sizing, producing a classic CWE-122 heap overflow; the CVSS vector confirms full confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The Microsoft WebP Image Extension (Microsoft Store package) must be installed on the victim's Windows system - it is not a default Windows component and must be explicitly installed by the user or an administrator. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H yields a score of 8.8, reflecting that exploitation requires only that a user open or preview a malicious WebP file - a low-friction social engineering step frequently achieved via phishing, malicious downloads, or compromised websites. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Update Microsoft WebP Image Extension to version 1.2.31.0 or later via the Microsoft Store - this is the vendor-released patch per the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70351. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running Microsoft WebP Image Extension and determine current versions deployed across the organization. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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