Vulnerability Details CVE-2026-33165
libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.17, a crafted HEVC bitstream causes an out-of-bounds heap write confirmed by AddressSanitizer. The trigger is a stale ctb_info.log2unitSize after an SPS change where PicWidthInCtbsY and PicHeightInCtbsY stay constant but Log2CtbSizeY changes, causing set_SliceHeaderIndex to index past the allocated image metadata array and write 2 bytes past the end of a heap allocation. This issue has been patched in version 1.0.17.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 1.6%
CVSS Severity
CVSS v3 Score 5.5
References
Products affected by CVE-2026-33165
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cpe:2.3:a:struktur:libde265:0.1
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cpe:2.3:a:struktur:libde265:0.10
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cpe:2.3:a:struktur:libde265:0.2
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cpe:2.3:a:struktur:libde265:0.3
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cpe:2.3:a:struktur:libde265:0.4
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cpe:2.3:a:struktur:libde265:0.5
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cpe:2.3:a:struktur:libde265:0.6
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cpe:2.3:a:struktur:libde265:0.7
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cpe:2.3:a:struktur:libde265:0.8
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cpe:2.3:a:struktur:libde265:0.9
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cpe:2.3:a:struktur:libde265:1.0.0
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cpe:2.3:a:struktur:libde265:1.0.1
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cpe:2.3:a:struktur:libde265:1.0.10
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cpe:2.3:a:struktur:libde265:1.0.11
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cpe:2.3:a:struktur:libde265:1.0.12
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cpe:2.3:a:struktur:libde265:1.0.14
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cpe:2.3:a:struktur:libde265:1.0.2
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cpe:2.3:a:struktur:libde265:1.0.3
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cpe:2.3:a:struktur:libde265:1.0.4
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cpe:2.3:a:struktur:libde265:1.0.5
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cpe:2.3:a:struktur:libde265:1.0.6
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cpe:2.3:a:struktur:libde265:1.0.7
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cpe:2.3:a:struktur:libde265:1.0.8
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cpe:2.3:a:struktur:libde265:1.0.9