CVE-2026-26990Public exploitNetwork attack vector

Authenticated database disclosure via unbound subnet prefix

Published Feb 20, 2026 · Updated Feb 20, 2026

Time-based blind SQL injection in LibreNMS before 26.2.0 allows remote authenticated users to read back-end database data. The IPv4 and IPv6 address-search code splits the address parameter at the slash and places its prefix into an SQL condition without binding. Any authenticated account can submit a crafted prefix through /ajax_table.php and infer schema, application data, usernames, and password hashes from response delays.

CVSS severity8.8
High
EPSS probability4.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Time-based blind SQL injection in LibreNMS before 26.2.0 allows remote authenticated users to read back-end database data. The IPv4 and IPv6 address-search code splits the address parameter at the slash and places its prefix into an SQL condition without binding. Any authenticated account can submit a crafted prefix through /ajax_table.php and infer schema, application data, usernames, and password hashes from response delays.

The record

CVE
CVE-2026-26990
Published
Feb 20, 2026
Updated
Feb 20, 2026
Vendor
LibreNMS
Product
LibreNMS
Classifications
CWE-89, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 26.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

LibreNMS · LibreNMSversion=< 26.2.0

Published CVSS scores

8.8GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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