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Vulnerability record · CVE-2026-47247 · published 21 July 2026

CVE-2026-47247: Struktur libheif information exposure vulnerability

Struktur · Libheif

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.

7.5 CVSS 3.1 High EPSS 0.48% · top 61.1% CWE-200 · Information exposureCWE-226 · CWE-226
7.5CVSS 3.1 base score
0.48%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
27 Jul 2026Last modified by NVD

Description

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

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/strukturag/libheif/security/advisories/GHSA-2vh6-whr3-cmq3 ExploitVendor AdvisoryMitigation
https://github.com/strukturag/libheif/security/advisories/GHSA-2vh6-whr3-cmq3 ExploitVendor AdvisoryMitigation

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2026-32740Struktur libheif out-of-bounds write vulnerabilitylibheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and prior contain a heap-buffer-overflow (write) vulnerability in the gri…EPSS 0.56%8.8CVE-2023-49460Struktur libheif vulnerabilitylibheif v1.17.5 was discovered to contain a segmentation violation via the function UncompressedImageCodec::decode_uncompressed_image.EPSS 0.76%8.8CVE-2023-49462Struktur libheif vulnerabilitylibheif v1.17.5 was discovered to contain a segmentation violation via the component /libheif/exif.cc.EPSS 0.80%8.8CVE-2023-49463Struktur libheif vulnerabilitylibheif v1.17.5 was discovered to contain a segmentation violation via the function find_exif_tag at /libheif/exif.cc.EPSS 0.77%8.8CVE-2023-49464Struktur libheif vulnerabilitylibheif v1.17.5 was discovered to contain a segmentation violation via the function UncompressedImageCodec::get_luma_bits_per_pixel_from_configuratio…EPSS 0.76%8.8CVE-2020-19498Struktur libheif vulnerabilityFloating point exception in function Fraction in libheif 1.4.0, allows attackers to cause a Denial of Service or possibly other unspecified impacts.EPSS 1.4%8.8CVE-2020-19499Struktur libheif out-of-bounds read vulnerabilityAn issue was discovered in heif::Box_iref::get_references in libheif 1.4.0, allows attackers to cause a Denial of Service or possibly other unspecifi…EPSS 1.4%8.8CVE-2019-11471Struktur libheif use after free vulnerabilitylibheif 1.4.0 has a use-after-free in heif::HeifContext::Image::set_alpha_channel in heif_context.h because heif_context.cc mishandles references to …EPSS 1.8%

Source: NIST National Vulnerability Database (record CVE-2026-47247), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.