CVE-2026-31932: Suricata krb5: quadratic complexity in krb5 buffering

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-02 · updated 2026-10-26
Weakness: CWE-407

Description

Suricata is a network IDS, IPS and NSM engine. Prior to versions 7.0.15 and 8.0.4, inefficiency in KRB5 buffering can lead to performance degradation. This issue has been patched in versions 7.0.15 and 8.0.4.

Affected products

OISF suricata: before 7.0.15; from 8.0.0 before 8.0.4 — fixed in 7.0.15, 8.0.4

How to fix

Upgrade to a fixed version: OISF suricata 7.0.15, 8.0.4. Check the vendor advisory for mitigations.

References

https://github.com/OISF/suricata/security/advisories/GHSA-rp9m-jcpw-hggr
https://redmine.openinfosecfoundation.org/issues/8305

Get alerted when CVE-2026-31932 or the next vulnerability affects your stack