HOMEVULNERABILITIESCVE-2026-33165
MEDIUM

CVE-2026-33165

CWE-787Published: March 20, 2026· Updated: Mar 23, 2026

5.0
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:1.6th

Official 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.

NVD Source

Technical Analysis

CVE-2026-33165 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.0.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

Affected Vendors & Products

struktur1 product
libde265
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/strukturag/libde265/commit/c7891e412106130b83f8e8ea8b7f907e9449b658
PATCHhttps://github.com/strukturag/libde265/security/advisories/GHSA-653q-9f73-8hvg

All References (3)

→
https://github.com/strukturag/libde265/commit/c7891e412106130b83f8e8ea8b7f907e9449b658Patch
→
https://github.com/strukturag/libde265/releases/tag/v1.0.17Release Notes
→
https://github.com/strukturag/libde265/security/advisories/GHSA-653q-9f73-8hvgExploit · Vendor Advisory · Patch

Quick Facts

CVE IDCVE-2026-33165
CVSS Score5.0 / 10
SeverityMEDIUM
WeaknessCWE-787
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedMar 20, 2026

Related CVEs (CWE-787)

CVE-2026-42369
10.0
CVE-2026-4746
10.0
CVE-2026-41678
9.8
CVE-2017-20229
9.8
CVE-2017-20227
9.8
CVE-2026-25986
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-33165 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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