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CVE-2026-33165

heap out-of-bounds write in libde265 1.0.16

Published: Mar 20, 2026Updated: Mar 23, 2026 Sources: CVE List NVDCWE-787
NVD MITRE
5.5CVSSMEDIUM
EPSS Score
0.2%
Top 86.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Breakdown

AV:LAC:LPR:NUI:RS:UC:NI:NA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-787

Affected Products

libde265strukturag
Library
OSS Libraries / generic-library
libde265struktur
LibraryLibrary
OSS Libraries / generic-library
strukturagoss-projectOSS Librariesaka libheif, libde265, strukturag/libde265
struktuross-projectOSS Librariesaka libde265, libheif, libde265 libheif

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/strukturag/libde265/security/advisories/GHSA-653q-9f73-8hvg
github.com
https://github.com/strukturag/libde265/commit/c7891e412106130b83f8e8ea8b7f907e9449b658
github.com
https://github.com/strukturag/libde265/releases/tag/v1.0.17
github.com

Timeline

Published
Mar 20, 2026
Last Updated
Mar 23, 2026

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