What is CVE-2026-47254?

CVE-2026-47254 is a medium-severity vulnerability in Strukturag Libheif, classified under Out-of-bounds Read. CVSS score: 6.1/10. Published 2026-07-21.

How severe is CVE-2026-47254?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Out-of-bounds Read in Strukturag Libheif

CVE-2026-47254

libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, `Track::init_sample_timing_table()` in `libheif/sequences/track.cc` stores an out-of-bounds chunk index (`m_chunks.size()`) into `m_presentation_timeline`…

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H.

Affected products

Strukturag Libheif — versions < 1.22.0

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-47254?: CVE-2026-47254 is a medium-severity vulnerability in Strukturag Libheif, classified under Out-of-bounds Read. CVSS score: 6.1/10. Published 2026-07-21.
How severe is CVE-2026-47254?: Medium severity. CVSS v3 base score is 6.1 out of 10.