Description
Sydent is a reference Matrix identity server. In Sydent versions 2.2.0 and prior, sissing 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. A patch for the vulnerability is in version 2.3.0. No workarounds are known to exist.
References (2)
Core 2
Core References
Patch, Third Party Advisory x_refsource_confirm
https://github.com/matrix-org/sydent/security/advisories/GHSA-pw4v-gr34-2553
Patch, Third Party Advisory x_refsource_misc
https://github.com/matrix-org/sydent/commit/3175fd358ebc2c310eab7a3dbf296ce2bd54c1da
Scores
CVSS v3
4.3
EPSS
0.0028
EPSS Percentile
51.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Details
CWE
CWE-400
CWE-20
Status
published
Products (2)
matrix/sydent
< 2.3.0
pypi/matrix-sydent
0 - 2.3.0PyPI
Published
Apr 15, 2021
Tracked Since
Feb 18, 2026