CVE-2026-84447: high-severity vulnerability in strukturag libheif
libheif: Derived-image indirect reference chains and tiled offsets bypass decode caching and MemoryHandle limits, causing CPU/memory amplification DoS
Published
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.5%
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
strukturag · libheifRelated CVEs — strukturag libheif
In the same product, most dangerous first.
CVE-2026-84383CRITICALlibheif: Heap buffer overflow in `scale_nearest_neighbor()` via duplicate Alpha planes from nested `iden`/`auxl` itemsEPSS 0.7%CVE-2026-32882HIGHlibheif: Heap Buffer OOB Read in overlay compositing due to wrong alpha strideEPSS 0.7%CVE-2026-32740HIGHlibheif: Heap-Buffer-Overflow Write in Grid Tile Chroma CompositingEPSS 0.7%CVE-2026-50142HIGHlibheif: unbounded heap allocation in HEIF sequence parser (stsz fixed-size mode missing bound check)EPSS 0.7%CVE-2026-62292HIGHlibheif: Out-of-bounds read in uncompressed unci tile range slicingEPSS 0.6%CVE-2026-84384HIGHlibheif: brotli/zlib decompression paths lack output-size limits, allowing decompression-bomb OOM/DoSEPSS 0.5%