element-hq synapse up to 1.152.0 allocation of resources

CVSS Meta Temp Score
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CTI Interest Score
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4.3$0-$5k0.00

Summaryinfo

A vulnerability was found in element-hq synapse up to 1.152.0. It has been declared as problematic. This vulnerability affects unknown code. Executing a manipulation can lead to allocation of resources. This vulnerability is registered as CVE-2026-45078. The attack needs to be launched locally. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in element-hq synapse up to 1.152.0. It has been declared as problematic. This vulnerability affects some unknown processing. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-45078 since 05/08/2026. The exploitation appears to be easy. The attack needs to be approached locally. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 317950 (Linux Distros Unpatched Vulnerability : CVE-2026-45078), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.152.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (317950). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Allocation of resources
CWE: CWE-770 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 317950
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-45078

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: synapse 1.152.1

Timelineinfo

05/08/2026 CVE reserved
05/28/2026 +20 days Advisory disclosed
05/28/2026 +0 days VulDB entry created
06/07/2026 +10 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-8q93-326v-3m7g
Status: Confirmed

CVE: CVE-2026-45078 (🔒)
GCVE (CVE): GCVE-0-2026-45078
GCVE (VulDB): GCVE-100-366820

Entryinfo

Created: 05/28/2026 20:07
Updated: 06/07/2026 03:56
Changes: 05/28/2026 20:07 (66), 06/01/2026 14:58 (2), 06/07/2026 03:56 (11)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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