CVE-2026-3665 xlnt-community xlnt XLSX File xlsx_consumer.cpp read_office_document null pointer dereference
A local attacker can cause a denial of service via null pointer dereference in the xlnt library's XLSX parser.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3665?
CVE-2026-3665 is a medium-severity vulnerability in xlnt-community xlnt, published on 7 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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.
Which versions are affected by CVE-2026-3665?
It affects 1 product.
Products include Xlnt-Community Xlnt.
How do I fix CVE-2026-3665?
No fix has been published for CVE-2026-3665 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-3665 being exploited?
There is no known exploitation of CVE-2026-3665 in the wild and no public exploit code.
Other vulnerabilities in xlnt-community xlnt
- CVE-2026-3663 xlnt-community xlnt XLSX File compound_document.cpp xsgetn out-of-bounds
- CVE-2026-3664 xlnt-community xlnt Encrypted XLSX File compound_document.cpp read_directory out-of-bounds
- CVE-2026-3463 xlnt-community xlnt Compound Document binary.hpp append heap-based overflow
- CVE-2026-2703 xlnt-community xlnt Encrypted XLSX File base64.cpp decode_base64 off-by-one
Sources
Also known as GHSA-f8w4-fphr-9q3w.