CVE-2026-47709 Details
Description
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.
A NULL pointer dereference vulnerability has been identified in libheif, a library for decoding and encoding HEIF and AVIF file formats. This issue affects versions through 1.21.2 and arises in the public C API function 'heif_image_handle_get_image_tiling()'. The vulnerability occurs when a malformed uncompressed HEIF image item includes an 'uncC' property but omits the 'ispe' property. In debug builds, this discrepancy triggers an assertion failure. However, in release builds with AddressSanitizer enabled, it leads to a crash by attempting to read a NULL pointer, causing a segmentation fault.
Users can upgrade to libheif version 1.22.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 22, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/strukturag/libheif/security/advisories/GHSA-4h72-vqgp-9376 | CISA-ADP | ExploitVendor AdvisoryMitigation |
| https://github.com/strukturag/libheif/issues/1802 | [email protected] | ExploitIssue TrackingThird Party Advisory |
| https://github.com/strukturag/libheif/pull/1806 | [email protected] | ExploitIssue TrackingPatchThird Party Advisory |
| https://github.com/strukturag/libheif/security/advisories/GHSA-4h72-vqgp-9376 | [email protected] | ExploitVendor AdvisoryMitigation |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| struktur libheif | < 1.22.0 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 27, 2026 | Initial Analysis | [email protected] |
| Jul 22, 2026 | CVE Modified | CISA-ADP |
| Jul 21, 2026 | New CVE Received | [email protected] |