What’s Vulnerable › Vulnerabilities

CVE-2026-22264: Suricata detect/alert: heap-use-after-free on alert queue expansion

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% 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-416

Description

Suricata is a network IDS, IPS and NSM engine. Prior to version 8.0.3 and 7.0.14, an unsigned integer overflow can lead to a heap use-after-free condition when generating excessive amounts of alerts for a single packet. Versions 8.0.3 and 7.0.14 contain a patch. As a workaround, do not run untrusted rulesets or run with less than 65536 signatures that can match on the same packet.

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/549d7bf60616de8e54686a188196453b5b22f715
• https://github.com/OISF/suricata/commit/5789a3d3760dbf33d93fc56c27bd9529e5bdc8f2
• https://github.com/OISF/suricata/commit/ac1eb394181530430fb7262969f423a1bf8f209b
• https://github.com/OISF/suricata/security/advisories/GHSA-mqr8-m3m4-2hw5
• https://redmine.openinfosecfoundation.org/issues/8190

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