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WS-2021-0110

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Date: August 19, 2025

Denial of service (via resource exhaustion) has been discovered in matrix-synapse before version 1.33.0. DoS due to improper input validation in third-party identifier endpoint Missing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion.

Language: Python

Severity Score

Related Resources (4)

https://github.com/matrix-org/synapse/pull/9855
https://github.com/matrix-org/synapse/commit/177dae270420ee4b4c8fa5e2c74c5081d98da320
https://github.com/matrix-org/synapse/security/advisories/GHSA-7h5v-85w9-pq6c
https://www.mend.io/vulnerability-database/WS-2021-0110

Severity Score

Weakness Type (CWE)

Improper Input Validation

CWE-20

Uncontrolled Resource Consumption

CWE-400

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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