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CWE

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CVE-2026-2703

Published: Feb 19, 2026

Modified: Feb 24, 2026

PUBLISHED

CVSS v3.1

3.3

LOW

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.

Vendor	Product	Versions
xlnt-community	xlnt	affected `1.6.0` affected `1.6.1`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

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

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

References

VDB-346649 | xlnt-community xlnt Encrypted XLSX File base64.cpp decode_base64 off-by-one

vdb-entry

technical-description

VDB-346649 | CTI Indicators (IOB, IOC, IOA)

signature

permissions-required

Submit #754377 | xlnt-community xlnt 5606f5b Heap-based Buffer Overflow

third-party-advisory

https://github.com/xlnt-community/xlnt/issues/137

issue-tracking

https://github.com/oneafter/0128/blob/main/xl1/repro

exploit

https://github.com/xlnt-community/xlnt/commit/f2d7bf494e5c52706843cf7eb9892821bffb0734

patch

https://github.com/xlnt-community/xlnt/

product

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