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.
References (7)
Core 7
Core References
Permissions Required, VDB Entry vdb-entry
technical-description
https://vuldb.com/?id.346649
Permissions Required, VDB Entry third-party-advisory
https://vuldb.com/?submit.754377
Issue Tracking issue-tracking
https://github.com/xlnt-community/xlnt/issues/137
Various Sources exploit
https://github.com/oneafter/0128/blob/main/xl1/repro
Various Sources product
https://github.com/xlnt-community/xlnt/
Permissions Required, VDB Entry signature
permissions-required
https://vuldb.com/?ctiid.346649
Scores
CVSS v3
3.3
EPSS
0.0021
EPSS Percentile
11.1%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-189
CWE-193
Status
published
Products (1)
xlnt-community/xlnt
< 1.6.1
Published
Feb 19, 2026
Tracked Since
Feb 19, 2026