CVE-2026-47247: high-severity vulnerability in strukturag libheif
libheif Vulnerable to Heap Information Disclosure via Grid Image Gap + Uninitialized Pixel Plane Allocation
Published · Updated
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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. Prior to version 1.22.0, two bugs in libheif chain to leak process heap memory as visible pixel values in decoded grid images. An attacker who uploads a crafted AVIF/HEIC file to any server-side image processor (WordPress, Sharp/libvips, ImageMagick, etc.) can recover heap data - including library function pointers sufficient to defeat ASLR, or any other secret - from the publicly-downloadable transcoded JPEG/PNG/WebP output. Local attack vectors are also possible. Version 1.22.0 fixes the issue.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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-2026-84447HIGHlibheif: Derived-image indirect reference chains and tiled offsets bypass decode caching and MemoryHandle limits, causing CPU/memory amplification DoSEPSS 0.5%