CVE-2026-26988Public exploitNetwork attack vector

Arbitrary SQL execution via raw IPv6 prefix

Published Feb 20, 2026 · Updated Feb 20, 2026

SQL injection in LibreNMS before 26.2.0 allows remote attackers to read or alter database data through a crafted IPv6 search. The ajax_table.php IPv6 branch splits the address at a slash and concatenates the resulting prefix directly into an SQL string instead of binding it. Network access to the web endpoint is sufficient; exploitation requires no privileges or user interaction and can expose or modify monitoring data.

CVSS severity9.3
Critical
EPSS probability7.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in LibreNMS before 26.2.0 allows remote attackers to read or alter database data through a crafted IPv6 search. The ajax_table.php IPv6 branch splits the address at a slash and concatenates the resulting prefix directly into an SQL string instead of binding it. Network access to the web endpoint is sufficient; exploitation requires no privileges or user interaction and can expose or modify monitoring data.

The record

CVE
CVE-2026-26988
Published
Feb 20, 2026
Updated
Feb 20, 2026
Vendor
LibreNMS
Product
LibreNMS
Classifications
CWE-89, T1190
Attack vector
network
Privileges
unauthenticated

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 privilegesunauthenticated

What is affected?

LibreNMS · LibreNMSversion=< 26.2.0

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
9.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesunauthenticated
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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