CVE-2026-45078— Synapse CPU starvation (Denial of Service)
Possible ATT&CK Techniques 1AI
T1496 · Resource HijackingAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| element-hq | synapse | < 1.152.1 | affected |
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I. Basic Information for CVE-2026-45078
Vulnerability Information
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Vulnerability Title
Synapse CPU starvation (Denial of Service)
Source: NVD (National Vulnerability Database)
Vulnerability Description
Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, local authenticated users can cause Synapse to starve other requests of CPU and lead to other requests failing, causing other users to be denied service. This vulnerability is fixed in 1.152.1.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
不加限制或调节的资源分配
Source: NVD (National Vulnerability Database)
Vulnerability Title
synapse 安全漏洞
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之前版本存在安全漏洞，该漏洞源于本地已认证用户可导致CPU资源耗尽，造成其他请求失败和拒绝服务。
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-2026-45078
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-45078 (1)
IV. Related Vulnerabilities
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V. Comments for CVE-2026-45078
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