What’s Vulnerable › Vulnerabilities

CVE-2026-3950: strukturag libheif stsz/stts track.cc load out-of-bounds

• Severity: low (CVSS 3.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-11 · updated 2026-06-17
• Weakness: CWE-119

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.

Affected products

• strukturag libheif: 1.21.0, 1.21.1, 1.21.2

References

• 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

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