Medium severity · published Jul 21, 2026
CVE-2026-47709
libheif has a NULL pointer dereference in heif_image_handle_get_image_tiling for malformed unci image missing ispe
5.5
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libheif · strukturag
< 1.22.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-47709
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-47709
Exploit
https://github.com/strukturag/libheif/issues/1802
Exploit
https://github.com/strukturag/libheif/pull/1806
Exploit
https://github.com/strukturag/libheif/security/advisories/GHSA-4h72-vqgp-9376
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