Buffer overflow in Strukturag Libheif
CVE-2026-3949
A vulnerability was determined in strukturag libheif up to 1.21.2. This affects the function vvdec_push_data2 of the file libheif/plugins/decoder_vvdec.cc of the component HEIF File Parser. Executing a manipulation of the argument size can lead to out-of-bounds read. The attack needs to be launched locally. The exploit has been publicly disclosed and may be utilized. This patch is called b97c8b5f198b27f375127cd597a35f2113544d03. It is advisable to implement a patch to correct this issue.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.002 (4.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 4.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.000
Affected products
- Strukturag Libheif — versions 1.21.0, 1.21.1, 1.21.2
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, vdb-entry)
- vuldb.com/ (signature, permissions-required)
- vuldb.com/ (third-party-advisory)
- github.com/strukturag/libheif/issues/1712 (issue-tracking)
- github.com/strukturag/libheif/issues/1712 (issue-tracking)
- github.com/biniamf/pocs/tree/main/libheif_vvdec (exploit)
- github.com/strukturag/libheif/commit/b97c8b5f198b27f375127cd597a35f2113544d03 (patch)
- github.com/strukturag/libheif/ (product)
Frequently asked questions
- What is CVE-2026-3949?
- CVE-2026-3949 is a low-severity vulnerability in Strukturag Libheif, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 3.3/10. Published 2026-03-11.
- How severe is CVE-2026-3949?
- Low severity. CVSS v3 base score is 3.3 out of 10.