Out-of-Bounds The advisory has been revoked - it doesn't affect any version of package libheif (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU2004-LIBHEIF-15517681
- published14 Mar 2026
- disclosed11 Mar 2026
Introduced: 11 Mar 2026
CVE-2026-3950 (opens in a new tab)Amendment
The Ubuntu security team deemed this advisory irrelevant for Ubuntu:20.04.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libheif package and not the libheif package as distributed by Ubuntu.
A vulnerability was identified in strukturag libheif up to 1.21.2. This impacts the function Track::load of the file libheif/sequences/track.cc of the component stsz/stts. The manipulation leads to out-of-bounds read. The attack needs to be performed locally. The exploit is publicly available and might be used. Applying a patch is the recommended action to fix this issue. The patch available is inofficial and not approved yet.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2026-3950
- https://github.com/Niebelungen-D/pocs/tree/main/heif_dec_sequence_chunk_idx_oob
- https://github.com/strukturag/libheif/
- https://github.com/strukturag/libheif/issues/1715
- https://github.com/strukturag/libheif/pull/1721
- https://vuldb.com/?ctiid.350382
- https://vuldb.com/?id.350382
- https://vuldb.com/?submit.766431