CVE-2026-45076— Synapse pagination denial of service
Possible ATT&CK Techniques 1AI
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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
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
Same product: synapse
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Synapse denial of service through media disk space consumpti
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Synapse: Invalid device keys degrade federation functionalit - CVE-2025-59161
In Element Web and Element Desktop, a malicious room can hid
Same weakness: CWE-20
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cpp-httplib DoS: Negative chunk-size in chunked Transfer-Enc - CVE-2026-44518
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Dokploy: Command Injection via Unescaped Branch Fields in De - CVE-2026-45615
mouse07410/asn1c: 1-byte Heap Out-of-Bounds Read in `INTEGER - CVE-2026-10021
Google Chrome 输入验证错误漏洞
V. Comments for CVE-2026-45076
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