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Vulnerability record · CVE-2026-4436 · published 9 April 2026

CVE-2026-4436: Missing authentication for critical function vulnerability

A low-privileged remote attacker can send Modbus packets to manipulate register values that are inputs to the odorant injection logic such that too much or too little odorant is injected into a gas line.

8.6 CVSS 3.1 High EPSS 0.55% · top 56.3% CWE-306 · Missing authentication for critical function Awaiting Analysis
8.6CVSS 3.1 base score
0.55%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

A low-privileged remote attacker can send Modbus packets to manipulate register values that are inputs to the odorant injection logic such that too much or too little odorant is injected into a gas line.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

References

LinkTags
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-099-02.json
https://lincenergysystems-my.sharepoint.com/:f:/p/h_baer/IgDYaHIhXpyLQJvnKPd6b80TAUgV7Lp8qmVYBFUb0lmr7ak?e=JLeADm
https://www.cisa.gov/news-events/ics-advisories/icsa-26-099-02

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Source: NIST National Vulnerability Database (record CVE-2026-4436), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.