CVE-2026-32882
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.32%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.1 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
- EPSS
- 0.32% probability · 25th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Source
- security-advisories@github.com
References
- https://github.com/strukturag/libheif/releases/tag/v1.22.0
- https://github.com/strukturag/libheif/security/advisories/GHSA-hg7q-rjr2-8x46
- https://access.redhat.com/security/cve/CVE-2026-32882
- https://bugzilla.redhat.com/show_bug.cgi?id=2480000
- https://github.com/strukturag/libheif/security/advisories/GHSA-hg7q-rjr2-8x46
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32882.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.