How severe is CVE-2026-22259?

CVE-2026-22259 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-22259 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-22259?

CVE-2026-22259 affects Oisf Suricata. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-22259?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-22259 have an EU (EUVD) identifier?

Yes. CVE-2026-22259 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4789.

When was CVE-2026-22259 published?

CVE-2026-22259 was published on 2026-01-27 and last updated on 2026-06-17.

CVE-2026-22259

CVE-2026-22259 is a high-severity vulnerability in Oisf Suricata with a CVSS 3.x base score of 7.5. 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-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-4789
Weakness: CWE-400
Affected product: Oisf Suricata
Published: 2026-01-27
Last modified: 2026-06-17

Description

Suricata is a network IDS, IPS and NSM engine. Prior to versions 8.0.3 and 7.0.14, specially crafted traffic can cause Suricata to consume large amounts of memory while parsing DNP3 traffic. This can lead to the process slowing down and running out of memory, potentially leading to it getting killed by the OOM killer. Versions 8.0.3 or 7.0.14 contain a patch. As a workaround, disable the DNP3 parser in the suricata yaml (disabled by default).

Frequently asked questions

What is CVE-2026-22259?: Suricata is a network IDS, IPS and NSM engine. Prior to versions 8.0.3 and 7.0.14, specially crafted traffic can cause Suricata to consume large amounts of memory while parsing DNP3 traffic. This can lead to the process slowing down and running out of memory, potentially leading to it getting killed by the OOM killer. Versions 8.0.3 or 7.0.14 contain a patch. As a workaround, disable the DNP3 parser in the suricata yaml (disabled by default).
How severe is CVE-2026-22259?: CVE-2026-22259 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-22259 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-22259?: CVE-2026-22259 affects Oisf Suricata. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-22259?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-22259 have an EU (EUVD) identifier?: Yes. CVE-2026-22259 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4789.
When was CVE-2026-22259 published?: CVE-2026-22259 was published on 2026-01-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:oisf:suricata:*:*:*:*:*:*:*:*

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