What’s Vulnerable › Vulnerabilities

CVE-2026-3665: xlnt-community xlnt XLSX File xlsx_consumer.cpp read_office_document null pointer dereference

• 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-404

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.

Affected products

• xlnt-community xlnt: through 1.6.1

References

• https://github.com/oneafter/0128/blob/main/xl4/repro
• https://github.com/xlnt-community/xlnt/
• https://github.com/xlnt-community/xlnt/issues/140
• https://vuldb.com/?ctiid.349554
• https://vuldb.com/?id.349554
• https://vuldb.com/?submit.764647

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