CVE-2026-32882: Red Hat Enterprise Linux 10

High severity, CVSS 7.1. EPSS: 0.7% chance of exploitation in the next 30 days.

libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and prior contain a heap buffer over-read in HeifPixelImage::overlay() in libheif/pixelimage.cc. When compositing an overlay image (iovl) whose child image has a different bit depth for the alpha channel than for the color channels, the function indexes into the alpha plane using the color channel stride (in_stride) instead of the previously retrieved alpha_stride, causing reads past the end of the alpha buffer (up to 3,123 bytes for a 100×50 image with 10-bit color and 8-bit alpha). A crafted HEIF file can exploit this to cause a denial of service (crash) or potentially disclose adjacent heap memory through leaked bytes embedded in the decoded output pixels. This issue has been fixed in versionThis issue has been fixed in version 1.22.0.

Affected products

• Red Hat Red Hat Enterprise Linux 10
• Strukturag Libheif: before 1.22.0 (fixed in 1.22.0)

Published 2026-05-19. Last modified 2026-07-24.