Read the docs
TI-2025-33482 Aliases CVE-2025-53538

Suricata's mishandling of data on HTTP2 stream 0 can lead to resource starvation

Priority LOW 34CWE-400Published · 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-400.

Summary

Suricata is a network IDS, IPS and NSM engine developed by the OISF (Open Information Security Foundation) and the Suricata community. In versions 7.0.10 and below and 8.0.0-beta1 through 8.0.0-rc1, mishandling of data on HTTP2 stream 0 can lead to uncontrolled memory usage, leading to loss of visibility. Workarounds include disabling the HTTP/2 parser, and using a signature like drop http2 any any -> any any (frame:http2.hdr; byte_test:1,=,0,3; byte_test:4,=,0,5; sid: 1;) where the first byte test tests the HTTP2 frame type DATA and the second tests the stream id 0. This is fixed in versions 7.0.11 and 8.0.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00537 45th percentileScored 2026-11-07
Fix Fixed suricata (OISF): 7.0.11, 8.0.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
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
OISFsuricatabefore 7.0.11; 8.0.0-beta1 to before 8.0.07.0.11, 8.0.0Patch availableCNA
  • suricata VendorOISF Affected before 7.0.11; 8.0.0-beta1 to before 8.0.0 Fixed in 7.0.11, 8.0.0 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:oisf:suricata:*:*:*:*:*:*:*:*before 7.0.11VulnerableOISF
cpe:2.3:a:oisf:suricata:8.0.0:beta1:*:*:*:*:*:*8.0.0 beta1VulnerableOISF
cpe:2.3:a:oisf:suricata:8.0.0:rc1:*:*:*:*:*:*8.0.0 rc1VulnerableOISF
  • cpe:2.3:a:oisf:suricata:*:*:*:*:*:*:*:* Versions before 7.0.11 Vulnerable ·OISF
  • cpe:2.3:a:oisf:suricata:8.0.0:beta1:*:*:*:*:*:* Versions 8.0.0 beta1 Vulnerable ·OISF
  • cpe:2.3:a:oisf:suricata:8.0.0:rc1:*:*:*:*:*:* Versions 8.0.0 rc1 Vulnerable ·OISF

Remediation

  • Fix · CNA suricata (OISF) Fixed in 7.0.11, 8.0.0

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-2025-53538

References

Patch 3

  • 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