CVE-2026-47709

libheif is a HEIF and AVIF file format decoder and encoder. Versions prior to 1.22.0 crashes in the public C API `heif_image_handle_get_image_tiling()` when a malformed uncompressed HEIF image item has an associated `uncC` property but no associated `ispe` property. In debug builds this trips the `ispe && uncC` assertion in `ImageItem_uncompressed::get_heif_image_tiling()`. In a release/NDEBUG ASan build, the same file causes a null pointer read at address `0xa8`. Version 1.22.0 fixes the issue.

• CWE-476

• https://github.com/strukturag/libheif/issues/1802Exploit, Issue Tracking, Third Party Advisory
• https://github.com/strukturag/libheif/pull/1806Exploit, Issue Tracking, Patch, Third Party Advisory
• https://github.com/strukturag/libheif/security/advisories/GHSA-4h72-vqgp-9376Exploit, Vendor Advisory, Mitigation
• https://github.com/strukturag/libheif/security/advisories/GHSA-4h72-vqgp-9376Exploit, Vendor Advisory, Mitigation

Published

Jul 21, 2026

Last Modified

Jul 27, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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