Out-of-bounds Read in Struktur Libheif
CVE-2026-41071
libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and prior, a crafted HEIF sequence file where the saiz box declares more samples than actually exist in the track's chunk table causes a heap-buffer-overflow (out-of-bounds read) in the SampleAuxInfoReader constructor. The SampleAuxInfoReader constructor iterates over saiz->get_num_samples() samples but doesn't validate that this count is consistent with the number of chunks in the chunks vector. When saiz declares more samples than the chunks cover, the loop increments current_chunk past chunks.size(), causing an out-of-bounds read on the chunks vector. The vulnerability is triggered during file parsing (heif_context_read_from_file) without any additional user interaction. Any application using libheif to open untrusted HEIF files is affected. This issue has been fixed in version 1.22.0.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (37.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.4% 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: 0.004 · change: +0.001
Affected products
- Struktur Libheif
- Strukturag Libheif — versions < 1.22.0
Weakness classification (CWE)
References
- github.com/strukturag/libheif/security/advisories/GHSA-xj92-xjff-h8w3 (Exploit, Mitigation, Vendor Advisory)
- github.com/strukturag/libheif/releases/tag/v1.22.0 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-41071?
- CVE-2026-41071 is a high-severity vulnerability in Struktur Libheif, classified under Out-of-bounds Read. CVSS score: 8.1/10. Published 2026-05-22.
- How severe is CVE-2026-41071?
- High severity. CVSS v3 base score is 8.1 out of 10.