CVE-2025-62821
Critical
Description
Microsoft HEIF Image Extensions 1.2.22.0 has an out-of-bounds read because CHEIFItemInfoEntry_GetDataSize can return success while leaving the reported data size as 0. This causes a caller to make a 1-byte allocation. Later, CopyPixels computes copy_size = stride * abs(roi_height) but does not check the source buffer length before a memmove call.
SeverityCritical
CVSS9.1
Exploit probability—
Product
Microsoft Heif Image Extension
PublishedJun 19, 2026
First seenJun 19, 2026
Weakness typeCWE-125Out-of-bounds read
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft heif_image_extension | 1.2.22.0 | — |
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