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TI-2026-50047 Aliases CVE-2026-71418

Suricata doh2: crafted HTTP/2 DATA frames can cause quadratic CPU consumption

Priority MEDIUM 40CWE-407Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-407.

Summary

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, DNS-over-HTTP/2 processing in rust/src/http2/http2.rs retains previously processed HTTP/2 DATA frame contents instead of clearing the internal buffer. Multiple DATA frames with the EndOfStream flag set can grow the buffer to its 65 KiB limit while causing all prior contents to be processed again, producing quadratic CPU complexity, degraded packet processing, loss of monitoring visibility, or denial of service. This issue is fixed in version 8.0.6.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0062 49th percentileScored 2026-11-07
Fix Fixed suricata (OISF): 8.0.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OISFsuricata8.0.0 to before 8.0.68.0.6Patch availableCNA
  • suricata VendorOISF Affected 8.0.0 to before 8.0.6 Fixed in 8.0.6 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:oisf:suricata:*:*:*:*:*:*:*:*8.0.0 to before 8.0.6VulnerableOISF
  • cpe:2.3:a:oisf:suricata:*:*:*:*:*:*:*:* Versions 8.0.0 to before 8.0.6 Vulnerable ·OISF

Remediation

  • Fix · CNA suricata (OISF) Fixed in 8.0.6

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-71418

References

Patch 2

Advisory 1

Other 2

  • TI-2026-33506 ikev2: unbounded client transform storage can lead to resource exhaustion CVSS 3.1HIGH 7.5
  • TI-2026-33484 Suricata lua/tls: null dereference in TlsGetCertInfo CVSS 3.1HIGH 7.5
  • TI-2024-31811 Suricata ja4: invalid alpn leads to panic CVSS 3.1HIGH 7.5
  • TI-2020-13673 Directory Traversal vulnerability found in Pfsense v.2.1.3 and Pfsense Suricata v.1.4.6… CVSS 3.1HIGH 7.5
  • TI-2023-17928 In Suricata before 6.0.13, an adversary who controls an external source of Lua rules may… CVSS 3.1CRITICAL 9.8
  • TI-2026-63304 Use after free in OISF Suricata CVSS 3.1CRITICAL 9.4
See all 99 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences