CVE-2026-2703CWE-193

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

Medium · published February 19, 2026

CVSS v4.0
4.8
EPSS
0%
Percentile
11.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
4.8 · MEDIUM
Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
EPSS
0.00217 · 11.6th percentile
Weakness
CWE-193 · Off-by-one Error
Published
2026-02-19T04:02Z
EPSS history
Timeline
  • 19 FEB 04:02Z
    xlnt-community xlnt Encrypted XLSX File base64.cpp decode_base64 off-by-one
    cvelistv5