CVE-2026-32741

01/תיאור (מקור, אנגלית)

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.

02/קישורים6

• github.com/strukturag/libheif/releases/tag/v1.22.0
• github.com/strukturag/libheif/security/advisories/GHSA-j3w5-7w‮…
• access.redhat.com/security/cve/CVE-2026-32741
• bugzilla.redhat.com/show_bug.cgi?id=2480002
• github.com/strukturag/libheif/security/advisories/GHSA-j3w5-7w‮…
• security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3274‮…