CVE-2026-120208
libheif 1.18.0 before 1.23.3 Heap Buffer Overflow via unci Mixed-Interleave Decoder
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
libheif 1.18.0 before 1.23.3 contains a heap-based buffer overflow vulnerability in unc_decoder_mixed_interleave::processTile() that allows attackers to write out of bounds by supplying chroma components with unequal bit depths. Attackers can craft a HEIF file declaring, for example, 16-bit Cb and 8-bit Cr to trigger file-controlled heap writes past the Cr plane, potentially achieving code execution in image-processing pipelines.
| CWE | CWE-122 |
| Vendor | strukturag |
| Product | libheif |
| Published | Oct 31, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
strukturag / libheif
1.18.0 < 1.23.3
References
github.com: https://github.com/strukturag/libheif/security/advisories/GHSA-x8r2-mggj-j6wr github.com: https://github.com/strukturag/libheif/commit/9d3cd91d7b1c8c68deef6d06057ab956bcb0dfb9 github.com: https://github.com/strukturag/libheif/releases/tag/v1.23.3 github.com: https://github.com/strukturag/libheif/blob/v1.23.2/libheif/codecs/uncompressed/unc_decoder_mixed_interleave.cc#L95 vulncheck.com: https://www.vulncheck.com/advisories/libheif-1.18.0-before-1.23.3-heap-buffer-overflow-via-unci-mixed-interleave-decoder
Credits
Alex Thomas (Wordfence) poppo25 Wordfence Argus