PT-2026-23860 · Xlnt · Xlnt

Oneafter · Published 2026-03-07 · Updated 2026-03-10 · CVE-2026-3664

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

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

Description An issue exists in the xlnt library, specifically within the xlnt::detail::compound document::read directory function located in the source/detail/cryptography/compound document.cpp file. This relates to the Encrypted XLSX File Parser component and can lead to an out-of-bounds read condition. The issue is restricted to local execution and has been publicly disclosed.

Recommendations Apply patch 147 to resolve this issue.

Exploit

Fix

Buffer Overflow

Out of bounds Read

Weakness Enumeration

CWE-119

CWE-125

Related Identifiers

CVE-2026-3664

Affected Products

Xlnt

References · 15

• 🔥 https://github.com/oneafter/0128/blob/main/xl5/repro · Exploit
• https://github.com/xlnt-community/xlnt/pull/147 · Patch
• https://github.com/xlnt-community/xlnt/issues/141 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-3664 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-3664 · Security Note
• https://twitter.com/CVEnew/status/2030339316501950481 · Twitter Post
• https://t.me/cveNotify/154983 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2030303990777340218 · Twitter Post
• https://twitter.com/cyberbivash/status/2030317519492255824 · Twitter Post
• https://github.com/xlnt-community/xlnt · Note
• https://t.me/cveNotify/154597 · Telegram Post
• https://t.me/CVEtracker/46725 · Telegram Post
• https://vuldb.com/?submit.764646 · Note
• https://vuldb.com/?ctiid.349553 · Note
• https://vuldb.com/?id.349553 · Note