CVE-2026-2703

LOW 3.3

xlnt-community xlnt Encrypted XLSX File base64.cpp decode_base64 off-by-one

CVSS Score

3.3

EPSS Score

0.0%

EPSS Percentile

0th

A weakness has been identified in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::decode_base64 of the file source/detail/cryptography/base64.cpp of the component Encrypted XLSX File Parser. Executing a manipulation can lead to off-by-one. The attack requires local access. The exploit has been made available to the public and could be used for attacks. This patch is called f2d7bf494e5c52706843cf7eb9892821bffb0734. Applying a patch is advised to resolve this issue.

CWE	CWE-193 CWE-189
Vendor	xlnt-community
Product	xlnt
Published	Feb 19, 2026
Last Updated	Feb 24, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

xlnt-community / xlnt

1.6.0 1.6.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/?id.346649 vuldb.com: https://vuldb.com/?ctiid.346649 vuldb.com: https://vuldb.com/?submit.754377 github.com: https://github.com/xlnt-community/xlnt/issues/137 github.com: https://github.com/oneafter/0128/blob/main/xl1/repro github.com: https://github.com/xlnt-community/xlnt/commit/f2d7bf494e5c52706843cf7eb9892821bffb0734 github.com: https://github.com/xlnt-community/xlnt/

Credits

🔍 Oneafter (VulDB User)