PT-2026-22739 · Libbiosig · Libbiosig

Mark Bereza · CVE-2026-20777 · Published 2026-03-03 · Updated 2026-03-05

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions libbiosig versions 3.9.2 and Master Branch (db9a9a63)

Description A heap-based buffer overflow exists in the Nicolet WFT parsing functionality of libbiosig. A specially crafted .wft file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger this issue.

Recommendations libbiosig version 3.9.2: Avoid processing untrusted or malicious .wft files. libbiosig Master Branch (db9a9a63): Avoid processing untrusted or malicious .wft files.

Exploit

Fix

RCE

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

BDU:2026-04343

CVE-2026-20777

Affected Products

Libbiosig

References · 15

• 🔥 https://talosintelligence.com/vulnerability_reports/TALOS-2026-2362 · Exploit
• https://security-tracker.debian.org/tracker/CVE-2026-20777 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-20777 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-20777 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-20777 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-20777 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-20777 · Security Note
• https://bdu.fstec.ru/vul/2026-04343 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-20777 · Security Note
• https://twitter.com/CVEnew/status/2028849468389687704 · Twitter Post
• https://t.me/CVEtracker/46207 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2028873029283909960 · Twitter Post
• https://t.me/cveNotify/154362 · Telegram Post
• https://twitter.com/infoflowcloud/status/2028850778102751682 · Twitter Post
• https://twitter.com/TheHackerWire/status/2028856954362515620 · Twitter Post