CVE-2026-2703
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Off-by-One Vulnerability in xlnt Encrypted XLSX Parser

Publication date: 2026-02-19

Last updated on: 2026-04-29

Assigner: VulDB

Description
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.
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Meta Information
Published
2026-02-19
Last Modified
2026-04-29
Generated
2026-06-16
AI Q&A
2026-02-19
EPSS Evaluated
2026-06-14
NVD
CVE-2026-2703
EUVD
EUVD-2026-7426
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
xlnt-community xlnt to 1.6.1 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-189
CWE-193 A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.
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Executive Summary

This vulnerability exists in the xlnt-community xlnt library up to version 1.6.1, specifically in the function xlnt::detail::decode_base64 within the Encrypted XLSX File Parser component. It is caused by an off-by-one error that can be triggered through manipulation. The attack requires local access to the system.

Impact Analysis

Exploiting this vulnerability can lead to an off-by-one error, which may cause a denial of service or other unexpected behavior. The impact is limited as it requires local access and does not affect confidentiality or integrity, but it can affect availability.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, it is advised to apply the patch identified as f2d7bf494e5c52706843cf7eb9892821bffb0734.

Since the attack requires local access, limiting local access to trusted users can also reduce risk.

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