High severity · published Sep 18, 2026
CVE-2026-84447
libheif: Derived-image indirect reference chains and tiled offsets bypass decode caching and MemoryHandle limits, causing CPU/memory amplification DoS
7.5
CVSS
0.5%
EPSS
No
On KEV
Description
libheif is a HEIF and AVIF file format decoder and encoder. In 1.23.1 and earlier, crafted grid, iovl, and iden reference graphs can repeatedly decode the same base image because processed_ids is copied per branch and ImageItem::decode_image() has no shared operation budget. This vulnerability is fixed in 1.23.2.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libheif · strukturag
< 1.23.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-84447
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-84447
github.com
https://github.com/strukturag/libheif/commit/30b52a4e829efe0ee6d7208e8500b99f664af5e9
github.com
https://github.com/strukturag/libheif/releases/tag/v1.23.2
github.com
https://github.com/strukturag/libheif/security/advisories/GHSA-x8xm-cm2c-cfc8
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