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CVE-2026-45764— Suricata http2: protocol-change type confusion can lead to denial of service

Quick assessment

Affected
OISF suricata
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Suricata 是一个网络入侵检测系统（IDS）、入侵防御系统（IPS）和网络安全监控引擎。在 7.0.16 和 8.0.5 版本之前，在处理 HTTP/2 流量时发生的协议变更可能导致 Suricata 中出现类型混淆（type confusion）问题。经过精心构造的流量可能引发 Suricata 崩溃，从而导致服务拒绝（DoS）漏洞。7.0.16 和 8.0.5 版本已包含修复。作为临时缓解措施，如果不需要 HTTP/2 解析，可以将其禁用。

CVSS 9.1 · Critical EPSS 0.07% · P21
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I. Basic Information for CVE-2026-45764

Vulnerability Information
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Vulnerability Title
Suricata http2: protocol-change type confusion can lead to denial of service
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用不兼容类型访问资源(类型混淆)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OISF suricata >= 8.0.0, < 8.0.5 -

II. Public POCs for CVE-2026-45764

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III. Intelligence Information for CVE-2026-45764

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Vendor Pages for CVE-2026-45764 (1)

Other References for CVE-2026-45764 (2)

Same Patch Batch · OISF · 2026-09-10 · 9 CVEs total

CVE-2026-45747 7.5 HIGH Suricata lua/tls: null dereference in TlsGetCertInfo
CVE-2026-46387 7.5 HIGH Suricata http2: decompression bomb can cause denial of service in Suricata
CVE-2026-45759 7.5 HIGH Suricata http1: quadratic Content-Disposition processing can lead to denial of service
CVE-2026-45762 7.5 HIGH Suricata defrag: missing address-family check can lead to remote crash
CVE-2026-45763 5.9 MEDIUM Suricata lua: sandbox allocation limit not enforced for new allocations
CVE-2026-45751 5.9 MEDIUM Suricata detect/transform: use-after-free in dotprefix transform
CVE-2026-45752 5.9 MEDIUM Suricata detect/transform: use-after-free in decompress transforms
CVE-2026-45761 3.3 LOW Suricata detect: case-insensitive frame handling can cause heap buffer overflow during rul

IV. Related Vulnerabilities

Same product: suricata
Same vendor: OISF
Same weakness: CWE-843

V. Comments for CVE-2026-45764

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