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OpenAdvisories
High · 7.5 CVE-2026-31933 EUVD-2026-18241

Suricata stream: quadratic complexity in stream inspection

Published Apr 2, 2026 · Updated Apr 3, 2026 · Assigned by GitHub_M

Description

Suricata is a network IDS, IPS and NSM engine. Prior to versions 7.0.15 and 8.0.4, specially crafted traffic can cause Suricata to slow down, affecting performance in IDS mode. This issue has been patched in versions 7.0.15 and 8.0.4.

Affected products

VendorProductAffectedFixed
OISF suricata < 7.0.15, >= 8.0.0, < 8.0.4 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 suricata 1:8.0.4-1 —
Debian 13 suricata 1:7.0.10-1+deb13u4 —
ReleasePackageFixed inAdvisory
Ubuntu 26.10 suricata No fix yet —
Ubuntu 26.04 LTS suricata No fix yet —
Ubuntu 25.10 suricata No fix yet —
Ubuntu 24.04 LTS suricata No fix yet —
Ubuntu 22.04 LTS suricata No fix yet —
Show 2 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 18.04 LTS suricata No fix yet —
Ubuntu 16.04 LTS suricata No fix yet —
ReleasePackageFixed inAdvisory
openSUSE Tumbleweed suricata 8.0.4-1.1 openSUSE-SU-2026:10443-1
ReleasePackageFixed inAdvisory
Alpine v3.24 suricata 8.0.6-r0 —

Advisories 1

References