libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and below contain a heap buffer overflow in MaskImageCodec::decode_mask_image(). When decoding a HEIF file containing a mask image (mski), the function copies the full iloc extent data into a pixel buffer using memcpy(dst, data.data(), data.size()). The copy length data.size() is determined by the iloc extent in the file (attacker-controlled), while the destination buffer is sized based on the declared image dimensions. Because no upper-bound check exists on the data length, a crafted file whose iloc extent exceeds the pixel buffer allocation overflows the heap. The vulnerable single-memcpy branch is reached when the mskC property specifies bits_per_pixel = 8 and the ispe property declares an even width ≥ 64 (so that stride == width), with no changes to default security limits or external codec plugins required. This issue has been fixed in version 1.22.0.
References
Configurations
No configuration.
History
20 May 2026, 17:16
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| References | () https://github.com/strukturag/libheif/security/advisories/GHSA-j3w5-7whq-p37q - |
19 May 2026, 21:16
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| New CVE |
Information
Published : 2026-05-19 21:16
Updated : 2026-05-20 17:16
NVD link : CVE-2026-32741
Mitre link : CVE-2026-32741
CVE.ORG link : CVE-2026-32741
JSON object : View
Products Affected
No product.
CWE
CWE-122
Heap-based Buffer Overflow