CVE-2026-2703

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.

CVSS v3 3.3 LOW
CVSS v2.0 1.7 LOW

3.3^/10

CVSS v3 : LOW

Vector :

Exploitability : 1.8 / Impact : 1.4

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

1.7^/10

CVSS v2.0 : LOW

Vector : AV:L/AC:L/Au:S/C:N/I:N/A:P

Exploitability : 3.1 / Impact : 2.9

Access Vector LOCAL

Access Complexity LOW

Authentication SINGLE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References

Link	Resource
https://github.com/oneafter/0128/blob/main/xl1/repro	Exploit
https://github.com/xlnt-community/xlnt/	Product
https://github.com/xlnt-community/xlnt/commit/f2d7bf494e5c52706843cf7eb9892821bffb0734	Patch
https://github.com/xlnt-community/xlnt/issues/137	Exploit Issue Tracking Vendor Advisory
https://vuldb.com/?ctiid.346649	Permissions Required VDB Entry
https://vuldb.com/?id.346649	Third Party Advisory VDB Entry
https://vuldb.com/?submit.754377	Third Party Advisory VDB Entry

Configurations

Configuration 1 (hide)

cpe:2.3:a:xlnt-community:xlnt:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-02-19 07:17

Updated : 2026-03-10 20:28

NVD link : CVE-2026-2703

Mitre link : CVE-2026-2703

CVE.ORG link : CVE-2026-2703

JSON object : View

Products Affected

xlnt-community

xlnt

CWE

CWE-189

Numeric Errors

CWE-193

Off-by-one Error

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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."}, {"lang": "es", "value": "Se ha identificado una debilidad en xlnt-community xlnt hasta 1.6.1. La cual afecta a la funci\u00f3n xlnt::detail::decode_base64 del archivo source/detail/cryptography/base64.cpp del componente Analizador de Archivos XLSX Cifrados. Si se manipula se puede provocar un off-by-one. El ataque requiere acceso local. El exploit se ha puesto a disposici\u00f3n del p\u00fablico y podr\u00eda usarse para ataques. Este parche se llama f2d7bf494e5c52706843cf7eb9892821bffb0734. 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