CVE-2026-3663

A vulnerability was found in xlnt-community xlnt up to 1.6.1. This issue affects the function xlnt::detail::compound_document_istreambuf::xsgetn of the file source/detail/cryptography/compound_document.cpp of the component XLSX File Parser. Performing a manipulation results in out-of-bounds read. The attack is only possible with local access. The exploit has been made public and could be used. The patch is named 147. It is recommended to apply a patch to fix this issue.

• CWE-119
• CWE-125

• https://github.com/oneafter/0128/blob/main/xl3/reproExploit
• https://github.com/xlnt-community/xlnt/Product
• https://github.com/xlnt-community/xlnt/issues/139Exploit, Issue Tracking, Vendor Advisory
• https://github.com/xlnt-community/xlnt/pull/147Issue Tracking
• https://vuldb.com/?ctiid.349552Permissions Required, VDB Entry
• https://vuldb.com/?id.349552Third Party Advisory, VDB Entry
• https://vuldb.com/?submit.764644Third Party Advisory, VDB Entry

Published

Mar 7, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-36612Mercusys AC12G (EU) V1 with firmware AC12G(EU)_V1_200909 ena…6.4
• CVE-2026-36613Mercusys AC12G (EU) V1 with firmware AC12G(EU)_V1_200909 ret…4.3
• CVE-2026-36615Mercusys AC12G (EU) V1 with firmware AC12G(EU)_V1_200909 exp…4.3
• CVE-2026-36616Mercusys AC12G (EU) V1 with firmware AC12G(EU)_V1_200909 con…5.9
• CVE-2026-36618Mercusys AC12G (EU) V1 with firmware AC12G(EU)_V1_200909 res…4.3
• CVE-2026-3662A vulnerability has been found in Wavlink WL-NU516U1 240425.…7.2
• CVE-2026-3664A vulnerability was determined in xlnt-community xlnt up to …5.5
• CVE-2026-3665A vulnerability was identified in xlnt-community xlnt up to …5.5
• CVE-2026-3666The wpForo Forum plugin for WordPress is vulnerable to arbit…8.8
• CVE-2026-36669An unauthenticated arbitrary file upload vulnerability in ck…9.8
• CVE-2026-3667A security flaw has been discovered in Freedom Factory dGEN1…5.3
• CVE-2026-36670A Time-Based Blind SQL Injection vulnerability in the alias_…8.8