Heap-based Buffer Overflow in xlnt by xlnt-community
CVE-2026-3463
Key Information:
- Vendor
Xlnt-community
- Status
- Vendor
- CVE Published:
- 3 March 2026
Badges
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.

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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.
References
CVSS V4
Timeline
- ๐ก
Public PoC available
- ๐พ
Exploit known to exist
Vulnerability published
Vulnerability Reserved
