CVE-2026-84447 Details
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.
A vulnerability in libheif versions through 1.23.1 allows for CPU and memory amplification denial-of-service attacks by exploiting derived-image reference chains. The issue arises because the decoding process for certain derived image types (grid and overlay) does not cache results, leading to repeated, unnecessary decoding of the same base image. This is compounded by the fact that the cycle-detection mechanism only prevents circular references, not repeated decodings, creating a legal but inefficient reference structure. Additionally, the experimental tiled image type can pre-allocate excessive memory without proper limits, further exacerbating the problem.
Users are advised to upgrade to libheif version 1.23.2, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 18, 2026CISA-ADP
Assessed Sep 18, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/strukturag/libheif/security/advisories/GHSA-x8xm-cm2c-cfc8 | CISA-ADP | AdvisoryBundleRemedyVendor |
| https://github.com/strukturag/libheif/commit/30b52a4e829efe0ee6d7208e8500b99f664af5e9 | [email protected] | Source CodeVendor |
| https://github.com/strukturag/libheif/releases/tag/v1.23.2 | [email protected] | Release NotesVendor |
| https://github.com/strukturag/libheif/security/advisories/GHSA-x8xm-cm2c-cfc8 | [email protected] | AdvisoryBundleRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-770 | Allocation of Resources Without Limits or Throttling | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| strukturag libheif | <= 1.23.1 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 18, 2026 | CVE Modified | CISA-ADP |
| Sep 18, 2026 | New CVE Received | [email protected] |