Heap-based Buffer Overflow in xlnt by xlnt-community
CVE-2026-3463

4.8MEDIUM

Key Information:

Vendor

Xlnt-community

Status
Xlnt
Vendor
CVE Published:
3 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3463?

A vulnerability has been discovered in the xlnt community's xlnt, specifically affecting the function xlnt::detail::binary_writer::append within the source/detail/binary.hpp file. This flaw can lead to a heap-based buffer overflow, which could be exploited locally. An attacker with local access might exploit this vulnerability as the exploit code has been made publicly available. It is crucial to apply the patch provided (Patch name: 147) to mitigate the risk posed by this vulnerability.

Affected Version(s)

xlnt 1.6.0

xlnt 1.6.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-3463 - Proof of Concept

References

https://vuldb.com/?id.348530
vdb-entrytechnical-description
https://vuldb.com/?ctiid.348530
signaturepermissions-required
https://vuldb.com/?submit.764643
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Oneafter (VulDB User)
.