What is CVE-2026-49271?

CVE-2026-49271 is a medium-severity vulnerability in Struktur Libheif, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-06-19.

How severe is CVE-2026-49271?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Out-of-bounds Read in Struktur Libheif

CVE-2026-49271

libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.1, the uncompressed HEIF decoder validates explicit icef compressed-unit offsets using unit_offset + unit_size. Because the addition can wrap, a crafted HEIF…

Vulnerability class: Buffer Overflow

EPSS: 0.002 (10.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

Struktur Libheif
Strukturag Libheif — versions < 1.22.1

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-49271?: CVE-2026-49271 is a medium-severity vulnerability in Struktur Libheif, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-06-19.
How severe is CVE-2026-49271?: Medium severity. CVSS v3 base score is 6.5 out of 10.