What is CVE-2025-43966?

CVE-2025-43966 is a low-severity vulnerability in Struktur Libheif, classified under NULL Pointer Dereference. CVSS score: 2.9/10. Published 2025-04-21.

How severe is CVE-2025-43966?

Low severity. CVSS v3 base score is 2.9 out of 10.

NULL pointer dereference in Struktur Libheif

CVE-2025-43966

libheif before 1.19.6 has a NULL pointer dereference in ImageItem_iden in image-items/iden.cc.

Published 2025-04-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 2.9 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.003 (21.8th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 21.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Struktur Libheif — versions 0

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

github.com/strukturag/libheif/commit/b38555387e4b5dcf036fe45b0c440aca19b7b69c (Patch)
github.com/strukturag/libheif/compare/v1.19.5...v1.19.6 (Patch, Release Notes)

Frequently asked questions

What is CVE-2025-43966?: CVE-2025-43966 is a low-severity vulnerability in Struktur Libheif, classified under NULL Pointer Dereference. CVSS score: 2.9/10. Published 2025-04-21.
How severe is CVE-2025-43966?: Low severity. CVSS v3 base score is 2.9 out of 10.