CVE-2026-45076— Synapse pagination denial of service
Quick assessment
Affected
element-hq synapse
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.
synapse是Element开源的一个矩阵主服务器。 synapse 1.152.1之前版本存在输入验证错误漏洞，该漏洞源于恶意服务器可构造房间事件阻止完整历史记录提供给分页客户端。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| element-hq | synapse | < 1.152.1 |
affected |
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I. Basic Information for CVE-2026-45076
Vulnerability Information
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Vulnerability Title
Synapse pagination denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, in federated rooms, malicious homeservers can craft room events in such a way that prevents Synapse from providing full history to paginating clients. Clients could therefore fail to display room history. This vulnerability is fixed in 1.152.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
synapse 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
synapse是Element开源的一个矩阵主服务器。 synapse 1.152.1之前版本存在输入验证错误漏洞，该漏洞源于恶意服务器可构造房间事件阻止完整历史记录提供给分页客户端。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| element-hq | synapse | < 1.152.1 | - |
|
II. Public POCs for CVE-2026-45076
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-45076 (1)
IV. Related Vulnerabilities
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V. Comments for CVE-2026-45076
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