PT-2026-22730 · Xlnt Community · Xlnt

Oneafter · Published 2026-03-03 · Updated 2026-03-10 · CVE-2026-3463

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions xlnt-community xlnt versions up to 1.6.1

Description A flaw exists in xlnt-community xlnt up to version 1.6.1 related to the xlnt::detail::binary writer::append function within the source/detail/binary.hpp file of the Compound Document Parser component. This issue results in a heap-based buffer overflow. The exploitation of this issue is limited to local execution. The exploit code has been publicly released.

Recommendations Install patch 147 to address this issue.

Exploit

Fix

Buffer Overflow

Heap Based Buffer Overflow

Weakness Enumeration

CWE-119

CWE-122

Related Identifiers

CVE-2026-3463

Affected Products

Xlnt

References · 17

• 🔥 https://github.com/oneafter/0128/blob/main/xl2/repro · Exploit
• https://github.com/xlnt-community/xlnt/issues/138 · Vendor Advisory
• https://github.com/xlnt-community/xlnt/pull/147 · Patch
• https://osv.dev/vulnerability/CVE-2026-3463 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-3463 · Security Note
• https://github.com/xlnt-community/xlnt/issues/138#issuecomment-3868381672 · Note
• https://vuldb.com/?id.348530 · Note
• https://twitter.com/CVEnew/status/2028820659602874426 · Twitter Post
• https://vuldb.com/?submit.764643 · Note
• https://t.me/CVEtracker/46198 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2028811556960563503 · Twitter Post
• https://twitter.com/cyberbivash/status/2028813415217553855 · Twitter Post
• https://twitter.com/infoflowcloud/status/2028821551907258778 · Twitter Post
• https://vuldb.com/?ctiid.348530 · Note
• https://github.com/xlnt-community/xlnt · Note