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Vulnerability · Published Mar 3, 2026 · Assigned by VulDB

CVE-2026-3463xlnt-community xlnt Compound Document binary.hpp append heap-based overflow

Low 3.3

In plain English

A low-severity heap buffer overflow in xlnt from xlnt-community. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).

Severity (CVSS 3.1)3.3Low
Exploit odds (30 days)0.2%top 87.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

VendorProductVersions
xlnt-community xlnt 1.6.01.6.1

Weakness: CWE-122, CWE-119 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C

References