What is the CVSS score of CVE-2026-22891?

CVE-2026-22891 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Is there a public PoC exploit available for CVE-2026-22891?

Yes, a public proof-of-concept exploit is available for CVE-2026-22891. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-22891?

Within 24 hours: Identify all systems and applications using libbiosig 3.9.2 or Master Branch; disable CLP file parsing if not essential to operations. Within 7 days: Implement network segmentation to isolate affected systems; restrict file upload and processing capabilities to trusted internal sources only; monitor for suspicious activity. Within 30 days: Transition to alternative biomedical signal libraries or await vendor patch; establish vendor communication protocol for security updates.

Libbiosig CVE-2026-22891

CRITICAL

Heap-based Buffer Overflow (CWE-122)

2026-03-03 talos-cna@cisco.com

Buffer Overflow Heap Overflow Libbiosig Libbiosig Project

9.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Craft malicious Intan CLP file
Exploit

Supply file to libbiosig parser
Execution

Trigger heap buffer overflow
Impact

Execute arbitrary code

Vulnerability Assessment

Weakness	CWE CWE-122 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Heap buffer bounds checking MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	libbiosig version 3.9.2 or Master Branch with Intan CLP file parsing enabled. Attacker must provide crafted CLP file to vulnerable application. No authentication or user interaction required beyond file access to parser.
Impact	CVSS 9.8.
Exploit ScenarioDerived	Crafted CLP file triggers heap overflow.

Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.

Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Heap overflow in libbiosig 3.9.2 Intan CLP parsing. PoC available.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:05 CVSS 9.8

Heap overflow in libbiosig CLP parser.

RemediationAI

Update libbiosig.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

CWE-122 heap-based buffer overflow.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Mar 05, 2026 - 18:15 vuln.today

Public exploit code

CVE Published

Mar 03, 2026 - 15:16 nvd

CRITICAL 9.8

DescriptionCVE.org

A heap-based buffer overflow vulnerability exists in the Intan CLP parsing functionality of The Biosig Project libbiosig 3.9.2 and Master Branch (db9a9a63). A specially crafted Intan CLP file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability.

Executive ViewAI

Why It Matters

A critical vulnerability in libbiosig 3.9.2 allows arbitrary code execution through malicious Intan CLP files, with public exploits already available. Organizations using this library for biomedical signal processing face immediate risk of system compromise if processing untrusted CLP files from external sources.

Business Impact: Severe

Compensating Controls

Disable Intan CLP file parsing functionality if not operationally required; implement strict file validation and source restrictions (only process CLP files from trusted, authenticated internal sources); segment affected systems from critical infrastructure; deploy application whitelisting to prevent arbitrary code execution; monitor process execution for abnormal behavior; consider sandboxing CLP file processing in isolated virtual environments.

Threat Intelligence Overview

EPSS Score

0.1%

Top 69% exploitable

Exploit

POC

Public exploit code exists

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC Yes

EPSS 0.1%

Patch available Yes

Active threat No

Deciding rule

CRITICAL severity + public POC available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +49

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Heap Overflow HIGH

A heap overflow occurs when a program writes data beyond the bounds of a buffer allocated in the heap memory region.