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Vulnerability record · CVE-2026-32882 · published 19 May 2026

CVE-2026-32882: Out-of-bounds read vulnerability

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.

7.1 CVSS 3.1 High EPSS 0.59% · top 53.9% CWE-125 · Out-of-bounds read Deferred
7.1CVSS 3.1 base score
0.59%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
24 Jul 2026Last modified by NVD

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/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-32882), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.