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4.8
Libheif: Malicious Local Files Can Cause Data Exposure
CVE-2026-3950
Summary
A bug in the libheif library, used to decode certain video and image files, can allow an attacker to access and read sensitive data on a local system. This can happen if a malicious file is opened on the same system where the library is installed. To fix this, it is recommended to apply a patch, but be aware that the patch is not officially approved yet.
Original title
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...
Original description
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.
nvd CVSS2.0
1.7
nvd CVSS3.1
3.3
nvd CVSS4.0
4.8
Vulnerability type
CWE-119
Buffer Overflow
CWE-125
Out-of-bounds Read
- 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
Published: 11 Mar 2026 · Updated: 13 Mar 2026 · First seen: 11 Mar 2026