What is the CVSS score of CVE-2026-26988?

CVE-2026-26988 has a CVSS 3.1 base score of 9.1 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N. EPSS exploitation probability: 0.0%.

Is there a public PoC exploit available for CVE-2026-26988?

Yes, a public proof-of-concept exploit is available for CVE-2026-26988. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-26988?

Within 24 hours: Identify and inventory all LibreNMS instances and their versions; isolate or restrict network access to affected instances if patching cannot be completed immediately. Within 7 days: Apply vendor patches to upgrade all LibreNMS deployments to version 25.12.1 or later; validate patches in test environment first. Within 30 days: Conduct security audit of database access logs for signs of exploitation; review and strengthen authentication and access controls for monitoring infrastructure.

Librenms CVE-2026-26988

CRITICAL

SQL Injection (CWE-89)

2026-02-20 security-advisories@github.com

GHSA-h3rv-q4rq-pqcv

PHP SQLi SNMP MySQL Librenms

9.1

CVSS 3.1 · GitHub Advisory

View

Attack ChainAIDerived

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

Access

Send crafted IPv6 search request to ajax_table.php
Delivery

Inject SQL payload in prefix parameter
Exploit

Bypass input sanitization
Execution

Execute arbitrary SQL query
Impact

Extract sensitive database contents

Vulnerability Assessment

Weakness	CWE CWE-89 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization Parameterized queries, prepared statements MITRE ATT&CK 2 techniques across 2 tactics: Initial Access, Persistence 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	LibreNMS versions 25.12.0 and below with ajax_table.php endpoint accessible. Attacker must send HTTP request to the IPv6 address search functionality; no authentication required. Default deployments exposed to network are vulnerable.
Impact	CVSS 9.1. Network monitoring data exposure.
Exploit ScenarioDerived	SQL injection extracts SNMP credentials, network topology.

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

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

SQL injection in LibreNMS 25.12.0 and below. PoC and patch available.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:04 CVSS 9.1

SQLi in LibreNMS network monitoring.

RemediationAI

Update LibreNMS.

Affected Packages

composer librenms/librenms fix: 26.2.0

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in composer

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

Technical ContextAI · show details

CWE-89 in network monitoring tool.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 9.1 CRITICAL

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

PoC Detected

Feb 20, 2026 - 16:31 vuln.today

Public exploit code

Patch released

Feb 20, 2026 - 16:31 nvd

Patch available

CVE Published

Feb 20, 2026 - 02:16 nvd

CRITICAL 9.1

DescriptionGitHub Advisory

LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 25.12.0 and below contain an SQL Injection vulnerability in the ajax_table.php endpoint. The application fails to properly sanitize or parameterize user input when processing IPv6 address searches. Specifically, the address parameter is split into an address and a prefix, and the prefix portion is directly concatenated into the SQL query string without validation. This allows an attacker to inject arbitrary SQL commands, potentially leading to unauthorized data access or database manipulation. This issue has been fixed in version 26.2.0.

Executive ViewAI

Why It Matters

LibreNMS network monitoring instances running version 25.12.0 or earlier are vulnerable to SQL injection attacks that could allow unauthorized database access, data theft, or system compromise. This critical vulnerability affects any organization using LibreNMS for network visibility and requires immediate patching to prevent potential breach of sensitive network configuration data.

Business Impact: Severe

Compensating Controls

Apply vendor patch. If immediate patching is not possible: (1) Restrict network access to ajax_table.php endpoint via WAF or firewall rules; (2) Implement input validation rules blocking SQL metacharacters; (3) Disable non-essential AJAX features until patched; (4) Segment LibreNMS infrastructure from critical systems; (5) Enable database query logging and monitor for anomalies.

Threat Intelligence Overview

EPSS Score

0.0%

Top 100% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

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 0.0%

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: +46

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

SQL Injection HIGH

SQL injection exploits the way applications construct database queries by mixing user input directly into SQL statements.

Affected Products (CPE)GitHub Advisory

cpe:2.3:a:librenms:librenms:*:*:*:*:*:*:*:*

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References

Advisories & patches

PATCH https://github.com/librenms/librenms/commit/15429580baba03ed1dd377bada1bde4b7a1175a1 REF https://github.com/librenms/librenms/pull/18777

Search Externally

GitHub PoC

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