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Vulnerability record · CVE-2025-62821 · published 19 June 2026

CVE-2025-62821: Microsoft heif image extension out-of-bounds read vulnerability

Microsoft · Heif Image Extension

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.

9.1 CVSS 3.1 Critical EPSS 1.1% · top 37.1% CWE-125 · Out-of-bounds read
9.1CVSS 3.1 base score
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
30 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/hyunjungg/CVE-2025-62821 ExploitThird Party Advisory
https://github.com/hyunjungg/CVE-2025-62821 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-62821), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.