Suricata stream: quadratic complexity in stream inspection

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.

Scores

EPSS (exploitation in 30 days)

0.36% · top 70% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

• CWE-407: Inefficient Algorithmic Complexity (opens in a new tab)All about CWE-407 and its CVEs

Affected products

• OISF · suricata

  • affected < 7.0.15
  • affected >= 8.0.0, < 8.0.4

References (2)

• https://github.com/OISF/suricata/security/advisories/GHSA-hvp5-gpr6-j4gp (opens in a new tab)x_refsource_CONFIRM
• https://redmine.openinfosecfoundation.org/issues/8272 (opens in a new tab)x_refsource_MISC

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-31933](https://trackcve.app/badge/CVE-2026-31933.svg)](https://trackcve.app/cve/CVE-2026-31933)

Record last updated 3 Apr 2026, 16:01 UTC.