CVE-2026-47709: libheif is a HEIF and AVIF file format decoder and encoder. Versions prior to 1.22.0 crashes in the public C API `heif_image_handle_get_image_tiling()` when a malformed uncompresse

mediumCVSS 5.5CVE-2026-47709

libheif is a HEIF and AVIF file format decoder and encoder. Versions prior to 1.22.0 crashes in the public C API heif_image_handle_get_image_tiling() when a malformed uncompressed HEIF image item has an associated uncC property but no associated ispe property. In debug builds this trips the ispe && uncC assertion in ImageItem_uncompressed::get_heif_image_tiling(). In a release/NDEBUG ASan build, the same file causes a null pointer read at address 0xa8. Version 1.22.0 fixes the issue.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 5.5
Published: 2026-07-21
Last updated: 2026-07-27
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-47709

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-477090.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 12% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-47709	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownUSN-8526-2: libheif vulnerabilitiesubuntu
unknownUSN-8526-1: libheif vulnerabilitiesubuntu

Recent advisories for libheif is a

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-48029: libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.19.0 through 1.21.2 hav…nvd · 2026-07-22
mediumCVE-2026-47254: libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, `Track::i…nvd · 2026-07-21
mediumCVE-2026-47251: libheif is a HEIF and AVIF file format decoder and encoder. The fix for CVE-2026-3949 (commit …nvd · 2026-07-21
highCVE-2026-47247: libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, two bugs …nvd · 2026-07-21
mediumCVE-2026-47178: libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.19.0 through 1.21.2,…nvd · 2026-07-21
mediumCVE-2026-47714: libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and prior, the …nvd · 2026-07-21