CVE-2026-45078: CWE-770: Allocation of Resources Without Limits or Throttling in element-hq synapse
CVE-2026-45078 is a medium severity vulnerability in element-hq's Synapse Matrix homeserver prior to version 1.152.1. It allows local authenticated users to cause resource starvation by consuming excessive CPU, which can lead to denial of service for other users. The issue arises from allocation of resources without limits or throttling. This vulnerability has been fixed in Synapse version 1.152.1.
AI Analysis
Technical Summary
Synapse, an open source Matrix homeserver implementation by element-hq, contained a resource allocation vulnerability (CWE-770) in versions before 1.152.1. Local authenticated users could exploit this by consuming excessive CPU resources, starving other requests and causing service denial to other users. The vulnerability is addressed in version 1.152.1, which includes fixes to limit or throttle resource allocation to prevent such denial of service conditions.
Potential Impact
Exploitation of this vulnerability allows local authenticated users to degrade service availability by monopolizing CPU resources, resulting in denial of service for other users. There is no indication of privilege escalation, remote exploitation without authentication, or data compromise. The impact is limited to service disruption.
Mitigation Recommendations
A fix is available in Synapse version 1.152.1. Users should upgrade to this version or later to remediate the vulnerability. No other mitigation guidance is provided or required as the issue is resolved by the official patch.
CVE-2026-45078: CWE-770: Allocation of Resources Without Limits or Throttling in element-hq synapse
Description
CVE-2026-45078 is a medium severity vulnerability in element-hq's Synapse Matrix homeserver prior to version 1.152.1. It allows local authenticated users to cause resource starvation by consuming excessive CPU, which can lead to denial of service for other users. The issue arises from allocation of resources without limits or throttling. This vulnerability has been fixed in Synapse version 1.152.1.
CVSS v4.0
Score 6.8medium
Affected software
pkg:github/element-hq/synapseRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Synapse, an open source Matrix homeserver implementation by element-hq, contained a resource allocation vulnerability (CWE-770) in versions before 1.152.1. Local authenticated users could exploit this by consuming excessive CPU resources, starving other requests and causing service denial to other users. The vulnerability is addressed in version 1.152.1, which includes fixes to limit or throttle resource allocation to prevent such denial of service conditions.
Potential Impact
Exploitation of this vulnerability allows local authenticated users to degrade service availability by monopolizing CPU resources, resulting in denial of service for other users. There is no indication of privilege escalation, remote exploitation without authentication, or data compromise. The impact is limited to service disruption.
Mitigation Recommendations
A fix is available in Synapse version 1.152.1. Users should upgrade to this version or later to remediate the vulnerability. No other mitigation guidance is provided or required as the issue is resolved by the official patch.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-08T18:45:10.097Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1871ece29bf47b50124587
Added to database: 05/28/2026, 16:48:44 UTC
Last enriched: 06/04/2026, 20:54:55 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 36
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