CVE-2026-2703

low-risk
Published 2026-02-19

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.

Do I need to act?

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0.01% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
3
CVSS 3.3/10 Low
LOCAL / LOW complexity

Affected Products (1)

Xlnt

Affected Vendors

Xlnt-Community

References (7)

Exploit https://github.com/oneafter/0128/blob/main/xl1/repro
Product https://github.com/xlnt-community/xlnt/
Patch https://github.com/xlnt-community/xlnt/commit/f2d7bf494e5c52706843cf7eb9892821bf...
Exploit https://github.com/xlnt-community/xlnt/issues/137
Permissions Required https://vuldb.com/?ctiid.346649
Third Party Advisory https://vuldb.com/?id.346649
Third Party Advisory https://vuldb.com/?submit.754377
18
/ 100
low-risk
Severity 13/34 · Low
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal