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4.8
xlnt-community: Malicious Data Can Cause Data Corruption
CVE-2026-2703
Summary
A bug in xlnt-community's xlnt library allows an attacker with local access to manipulate data in a way that can cause data corruption. This could potentially be exploited by attackers who have obtained the exploit code. Applying a patch is recommended to fix this issue.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| xlnt-community | xlnt | <= 1.6.1 | – |
Original title
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 ...
Original 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.
nvd CVSS2.0
1.7
nvd CVSS3.1
3.3
nvd CVSS4.0
4.8
Vulnerability type
CWE-189
CWE-193
- https://github.com/oneafter/0128/blob/main/xl1/repro
- https://github.com/xlnt-community/xlnt/
- https://github.com/xlnt-community/xlnt/commit/f2d7bf494e5c52706843cf7eb9892821bf...
- https://github.com/xlnt-community/xlnt/issues/137
- https://vuldb.com/?ctiid.346649
- https://vuldb.com/?id.346649
- https://vuldb.com/?submit.754377
Published: 19 Feb 2026 · Updated: 11 Mar 2026 · First seen: 6 Mar 2026