Buffer overflow in Struktur Libheif
CVE-2026-32740
libheif 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 grid tile compositing, allowing an attacker to write 64 bytes of fully attacker-controlled da…
Vulnerability class: Buffer Overflow
EPSS: 0.000 (3.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Struktur Libheif
- Strukturag Libheif — versions < 1.22.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-32740?
- CVE-2026-32740 is a high-severity vulnerability in Struktur Libheif, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2026-05-19.
- How severe is CVE-2026-32740?
- High severity. CVSS v3 base score is 8.8 out of 10.