Medium severity · published Mar 20, 2026
CVE-2026-33165
heap out-of-bounds write in libde265 1.0.16
5.0
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libde265 · strukturag
< 1.0.17 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33165
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33165
Patch
https://github.com/strukturag/libde265/commit/c7891e412106130b83f8e8ea8b7f907e9449b658
Release Notes
https://github.com/strukturag/libde265/releases/tag/v1.0.17
Exploit
https://github.com/strukturag/libde265/security/advisories/GHSA-653q-9f73-8hvg
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