Use After Free in Oisf Suricata
CVE-2026-22264
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.
Vulnerability class: Use-After-Free
EPSS: 0.003 (27.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H.
Affected products
- Oisf Suricata — versions < 7.0.14, >= 8.0.0, < 8.0.3
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Permissions Required, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-22264?
- CVE-2026-22264 is a high-severity vulnerability in Oisf Suricata, classified under Use After Free. CVSS score: 7.4/10. Published 2026-01-27.
- How severe is CVE-2026-22264?
- High severity. CVSS v3 base score is 7.4 out of 10.