CVE-2026-47178libheif has Heap Out Of Bounds Write in unci subsystem
Updated under an hour ago ()
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It affects strukturag libheif and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.19.0 through 1.21.2, a crafted HEIF file (uncompressed `unci` codec, tiled, component-interleaved, 4:2:0) triggers a heap out-of-bounds write in libheif's uncompressed tile decoder. The write overwrites the C++ vtable pointer of an adjacent `unc_decoder_component_interleave` object; the next virtual call dispatches to an attacker-chosen address. Version 1.22.0 patches the issue.
- CVSS
- 6.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
- Weakness (CWE)
- CWE-787
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Jul 22, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
strukturag libheif strukturag:libheif (from the name) | from 1.19.0, < 1.22.0 | CNA record |
struktur libheif struktur:libheif | from 1.19.0 before 1.22.0 | NVD |
References
- https://github.com/strukturag/libheif/security/advisories/GHSA-5x55-x5pf-9c6gx-refsource-confirm, exploit, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.