CVE-2026-32741
Published: 19 May 2026
Summary
CVE-2026-32741 is a high-severity Heap-based Buffer Overflow (CWE-122) vulnerability. Its CVSS base score is 7.1 (High).
Operationally, ranked at the 10.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
NVD 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…
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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.
Deeper analysisAI
Automated synthesis unavailable for this CVE.
Details
- CWE(s)