CVE-2026-3664 xlnt-community xlnt Encrypted XLSX File compound_document.cpp read_directory out-of-bounds
An out-of-bounds read in the xlnt library's encrypted XLSX parser allows attackers to cause denial of service or disclose information via malicious files.
- 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-2026-3664?
CVE-2026-3664 is a medium-severity memory corruption 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 determined in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::compound_document::read_directory of the file source/detail/cryptography/compound_document.cpp of the component Encrypted XLSX File Parser. Executing a manipulation can lead to out-of-bounds read. The attack is restricted to local execution. The exploit has been publicly disclosed and may be utilized. This patch is called 147. Applying a patch is advised to resolve this issue.
Which versions are affected by CVE-2026-3664?
It affects 1 product.
Products include Xlnt-Community Xlnt.
How do I fix CVE-2026-3664?
No fix has been published for CVE-2026-3664 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-3664 being exploited?
There is no known exploitation of CVE-2026-3664 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-2026-3665 xlnt-community xlnt XLSX File xlsx_consumer.cpp read_office_document null pointer dereference
- 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-3f3c-wc35-5wjv.