CVE-2026-45764

Suricata http2: protocol-change type confusion can lead to denial of service

Published Sep 10, 2026 CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed

Description

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to versions 7.0.16 and 8.0.5, a protocol change while processing HTTP/2 traffic could lead to type confusion in Suricata. Crafted traffic may cause Suricata to crash, resulting in denial of service. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, disable HTTP/2 parsing if it is not required.

Analysis

Technical impact

Suricata, a network intrusion detection and prevention engine, parses HTTP/2 traffic. In versions prior to 7.0.16 and 8.0.5, a protocol change during parsing can trigger type‑confusion (CWE‑843). Maliciously crafted HTTP/2 frames may cause Suricata to terminate, resulting in a denial of service for systems relying on the engine for monitoring.

Affected Systems

Suricata releases before 7.0.16 and before 8.0.5 are affected. All releases 7.0.16 and newer or 8.0.5 and newer contain the fix.

Risk and Exploitability

The CVSS base score of 9.1 indicates a critical severity. The EPSS score is not available, and the vulnerability is not listed in the CISA KEV catalog. An external attacker can inject malicious HTTP/2 traffic into a running Suricata instance, triggering the type‑confusion and causing a crash. No publicly known exploitation activity is reported at this time.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

OISF

suricata

affected

Version	Status	Constraints
`>= 8.0.0, < 8.0.5`	affected	—
`< 7.0.16`	affected	—

Configuration 1 [-]

OR	cpe:2.3:a:oisf:suricata::::::::
	cpe:2.3:a:oisf:suricata::::::::

No data.

Vendor Product Versions

Oisf

Suricata

Version	Status	Scheme	Platform
`[8.0.0,8.0.5)`	affected	semver	—
`[0,7.0.16)`	affected	semver	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade Suricata to version 7.0.16 or 8.0.5, or any newer release that includes the fix.
If an upgrade cannot be performed immediately, disable HTTP/2 parsing in the Suricata configuration to prevent the vulnerability from being triggered.
As an additional precaution, block HTTP/2 traffic at the network perimeter so that malicious frames never reach the Suricata instance.

Generated by OpenCVE AI on September 11, 2026 at 05:10 UTC.

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.633% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315
https://github.com/OISF/suricata/security/advisories/GHSA-5rvq-72r5-rqhr
https://nvd.nist.gov/vuln/detail/CVE-2026-45764
https://redmine.openinfosecfoundation.org/issues/8492
https://www.cve.org/CVERecord?id=CVE-2026-45764

History

Sep 16, 2026 8:30 PM Affected versions updated View changes

Type	Values Removed	Values Added
CPEs		cpe:2.3:a:oisf:suricata::::::::

Sep 16, 2026 12:15 AM Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
References		https://nvd.nist.gov/vuln/detail/CVE-2026-45764 https://www.cve.org/CVERecord?id=CVE-2026-45764
Metrics	threat_severity `None`	threat_severity `Important`

Sep 11, 2026 4:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Sep 11, 2026 7:45 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Oisf Oisf suricata
Vendors & Products		Oisf Oisf suricata

Sep 10, 2026 9:30 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to versions 7.0.16 and 8.0.5, a protocol change while processing HTTP/2 traffic could lead to type confusion in Suricata. Crafted traffic may cause Suricata to crash, resulting in denial of service. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, disable HTTP/2 parsing if it is not required.
Title		Suricata http2: protocol-change type confusion can lead to denial of service
Weaknesses		CWE-843
References		https://forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315 https://github.com/OISF/suricata/security/advisories/GHSA-5rvq-72r5-rqhr https://redmine.openinfosecfoundation.org/issues/8492
Metrics		cvssV3_1 `{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H'}`