Vulnerability · Published Sep 18, 2026 · Assigned by GitHub_M
CVE-2026-84447libheif: Derived-image indirect reference chains and tiled offsets bypass decode caching and MemoryHandle limits, causing CPU/memory amplification DoS
High 7.5
In plain English
A high-severity resource allocation without limits in libheif from strukturag. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libheif | no fix listed | DEBIAN-CVE-2026-84447 |
| Debian:13 | libheif | 1.23.4-1~deb13u1 | DEBIAN-CVE-2026-84447 |
| Debian:14 | libheif | 1.23.2-1 | DEBIAN-CVE-2026-84447 |
| Ubuntu:22.04:LTS | libheif | no fix listed | UBUNTU-CVE-2026-84447 |
| Ubuntu:24.04:LTS | libheif | 1.17.6-1ubuntu4.9 | USN-8846-1 |
| Ubuntu:24.04:LTS | libheif | no fix listed | UBUNTU-CVE-2026-84447 |
| Ubuntu:26.04:LTS | libheif | 1.21.2-3ubuntu0.6 | USN-8846-1 |
| Ubuntu:26.04:LTS | libheif | 1.21.2-3ubuntu0.6 | UBUNTU-CVE-2026-84447 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| strukturag | libheif | < 1.23.2 |
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H