How severe is CVE-2026-5434?

CVE-2026-5434 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-5434 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-5434?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-5434 have an EU (EUVD) identifier?

Yes. CVE-2026-5434 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31251.

When was CVE-2026-5434 published?

CVE-2026-5434 was published on 2026-05-21 and last updated on 2026-07-30.

CVE-2026-5434

CVE-2026-5434 is a medium-severity vulnerability with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-538.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31251
Weakness: CWE-538
Published: 2026-05-21
Last modified: 2026-07-30

Description

Honeywell Control Network Module (CNM) contains insertion of sensitive information into an unintended directory. An attacker could exploit this vulnerability through probing system files, potentially resulting in unintended access to protected data. Honeywell recommends updating to the most recent version of this product, service or offering [200.1]. The CNM versions affected are from [100.1, 101.1, 110.1, and 110.2].

Frequently asked questions

What is CVE-2026-5434?: Honeywell Control Network Module (CNM) contains insertion of sensitive information into an unintended directory. An attacker could exploit this vulnerability through probing system files, potentially resulting in unintended access to protected data. Honeywell recommends updating to the most recent version of this product, service or offering [200.1]. The CNM versions affected are from [100.1, 101.1, 110.1, and 110.2].
How severe is CVE-2026-5434?: CVE-2026-5434 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-5434 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-5434?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5434 have an EU (EUVD) identifier?: Yes. CVE-2026-5434 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31251.
When was CVE-2026-5434 published?: CVE-2026-5434 was published on 2026-05-21 and last updated on 2026-07-30.

References

https://www.honeywell.com/us/en/product-security

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