HOMEVULNERABILITIESCVE-2026-3665
MEDIUM

CVE-2026-3665

CWE-404Published: March 7, 2026· Updated: Mar 10, 2026

5.5
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:2.0th

Official Description

A vulnerability was identified in xlnt-community xlnt up to 1.6.1. The affected element is the function xlnt::detail::xlsx_consumer::read_office_document of the file source/detail/serialization/xlsx_consumer.cpp of the component XLSX File Parser. The manipulation leads to null pointer dereference. The attack must be carried out locally. The exploit is publicly available and might be used.

NVD Source

Technical Analysis

CVE-2026-3665 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 5.5.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

xlnt-community1 product
xlnt
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

ADVISORYhttps://github.com/xlnt-community/xlnt/issues/140
ADVISORYhttps://vuldb.com/?id.349554
ADVISORYhttps://vuldb.com/?submit.764647

All References (6)

→
https://github.com/oneafter/0128/blob/main/xl4/reproExploit
→
https://github.com/xlnt-community/xlnt/Product
→
https://github.com/xlnt-community/xlnt/issues/140Exploit · Issue Tracking · Vendor Advisory
→
https://vuldb.com/?ctiid.349554Permissions Required · VDB Entry
→
https://vuldb.com/?id.349554Third Party Advisory · VDB Entry
→
https://vuldb.com/?submit.764647Third Party Advisory · VDB Entry

Quick Facts

CVE IDCVE-2026-3665
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-404
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedMar 7, 2026

Related CVEs (CWE-404)

CVE-2026-11317
8.7
CVE-2026-1876
8.7
CVE-2026-1875
8.7
CVE-2026-45174
8.5
CVE-2026-2957
8.1
CVE-2026-7734
7.5

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-3665 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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