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TI-2026-02983 Aliases CVE-2026-3463GHSA-hhjx-x77r-qp36

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

Priority MEDIUM 55CWE-119Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · None · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00222 12th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD and the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
xlnt-communityxlnt1.6.0; 1.6.1—No fix listedCNA
  • xlnt Vendorxlnt-community Affected 1.6.0; 1.6.1 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:xlnt-community:xlnt:*:*:*:*:*:*:*:*up to 1.6.1Vulnerablexlnt-community
  • cpe:2.3:a:xlnt-community:xlnt:*:*:*:*:*:*:*:* Versions up to 1.6.1 Vulnerable ·xlnt-community

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-3463
  2. 2026-10-03 Alias added: GHSA-hhjx-x77r-qp36

References

Exploit 2

Patch 1

Other 2

  • TI-2026-03160 xlnt-community xlnt XLSX File xlsx_consumer.cpp read_office_document null pointer dereference CVSS 4.0MEDIUM 4.8
  • TI-2026-02313 xlnt-community xlnt Encrypted XLSX File base64.cpp decode_base64 off-by-one CVSS 4.0MEDIUM 4.8
  • TI-2026-03159 xlnt-community xlnt Encrypted XLSX File compound_document.cpp read_directory out-of-bounds CVSS 4.0MEDIUM 4.8
  • TI-2026-03158 xlnt-community xlnt XLSX File compound_document.cpp xsgetn out-of-bounds CVSS 4.0MEDIUM 4.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences