What’s Vulnerable › Vulnerabilities

CVE-2026-3664: xlnt-community xlnt Encrypted XLSX File compound_document.cpp read_directory out-of-bounds

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-07 · updated 2026-06-17
• Weakness: CWE-119

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.

Affected products

• xlnt-community xlnt: through 1.6.1

References

• https://github.com/oneafter/0128/blob/main/xl5/repro
• https://github.com/xlnt-community/xlnt/
• https://github.com/xlnt-community/xlnt/issues/141
• https://github.com/xlnt-community/xlnt/pull/147
• https://vuldb.com/?ctiid.349553
• https://vuldb.com/?id.349553
• https://vuldb.com/?submit.764646

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