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EUVD-2026-26334

fkie_cve-2021-29433

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.

GHSA-pw4v-gr34-2553 — Sydent DoS (via resource exhaustion) due to improper input validation

Affected: PyPI: matrix-sydent

### Impact

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.

### Patches

Fixed by 3175fd3.

### For more information

If you have any questions or comments about this advisory, email us at security@matrix.org.

gsd-2021-29433

PYSEC-2021-24

Affected: PyPI: matrix-sydent

### Impact 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. ### Patches Fixed by 3175fd3. ### Workarounds There are no known workarounds. ### References n/a ### For more information If you have any questions or comments about this advisory, email us at security@matrix.org.