CVE-2026-3463

Name: CVE-2026-3463
Creator: NVD / NIST
Published: 2026-03-03T12:16:06.88+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 1.9/10EPSS 0.19%

Last modified Jun 17, 2026

CVE-2026-3463 is a low-severity vulnerability rated 1.9/10 on the CVSS scale. A weakness has been identified in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::binary_writer::append of the file source/detail/binary.hpp of the component Compound Document Parser. EPSS estimates a 0.19% chance of exploitation in the next 30 days.

Description

A weakness has been identified in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::binary_writer::append of the file source/detail/binary.hpp of the component Compound Document Parser. This manipulation causes heap-based buffer overflow. The attack can only be executed locally. The exploit has been made available to the public and could be used for attacks. Patch name: 147. It is suggested to install a patch to address this issue.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS 4.0

1.9/10

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.19%

9.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Xlnt-Community	Xlnt	<= 1.6.1

References

https://github.com/oneafter/0128/blob/main/xl2/reproExploit
https://github.com/xlnt-community/xlnt/Product
https://github.com/xlnt-community/xlnt/issues/138Exploit, Issue Tracking, Vendor Advisory
https://github.com/xlnt-community/xlnt/issues/138#issuecomment-3868381672Issue Tracking
https://github.com/xlnt-community/xlnt/pull/147Issue Tracking
https://vuldb.com/?ctiid.348530Permissions Required, VDB Entry
https://vuldb.com/?id.348530Third Party Advisory, VDB Entry
https://vuldb.com/?submit.764643Third Party Advisory, VDB Entry

Timeline

Published: Mar 3, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-3463?

How severe is CVE-2026-3463?

CVE-2026-3463 has a CVSS score of 1.9/10 (LOW severity). The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.

How do I fix CVE-2026-3463?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-3463?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST