CVE-2026-32741 - libheif has a heap buffer overflow in decode_mask_image()

CVE-2026-32741 - libheif has a heap buffer overflow in decode_mask_image()

https://cvefeed.io/rssfeed/latest.atom / Tue, 05/19/2026 - 23:24
CVE ID :CVE-2026-32741
Published : May 19, 2026, 7:57 p.m. | 1 hour, 1 minute ago
Description :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.
Severity: 0.0 | NA
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