What’s Vulnerable › Vulnerabilities

CVE-2026-22259: Suricata dnp3: unbounded transaction growth

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-27 · updated 2026-06-17
• Weakness: CWE-400

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).

Affected products

• OISF suricata: before 7.0.14; from 8.0.0 before 8.0.3 — fixed in 7.0.14, 8.0.3

How to fix

Upgrade to a fixed version: OISF suricata 7.0.14, 8.0.3. Check the vendor advisory for mitigations.

References

• https://github.com/OISF/suricata/commit/50cac2e2465ca211eabfa156623e585e9037bb7e
• https://github.com/OISF/suricata/commit/63225d5f8ef64cc65164c0bb1800730842d54942
• https://github.com/OISF/suricata/security/advisories/GHSA-878h-2x6v-84q9
• https://redmine.openinfosecfoundation.org/issues/8181

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