Denial of service (via resource exhaustion) due to improper input validation on groups/communities endpoints
Impact
Missing input validation of some parameters on the groups (also known as communities) endpoints could cause excessive use of disk space and memory leading to resource exhaustion. Additionally clients may have issues rendering large fields.
Patches
This issue is fixed by #9321 and #9393.
Workarounds
The groups feature can be disabled (by setting enable_group_creation to False) to mitigate this issue. Note that it is disabled by default.
Other information
Note that the groups feature is not part of the Matrix specification and the chosen maximum lengths are arbitrary. Not all clients might abide by them.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | matrix-synapse | < 1.28.0 | 1.28.0 |
Referencias
- https://github.com/matrix-org/synapse/pull/9321
- https://pypi.org/project/matrix-synapse/
- https://github.com/matrix-org/synapse/pull/9393
- https://github.com/matrix-org/synapse/security/advisories/GHSA-jrh7-mhhx-6h88
- https://nvd.nist.gov/vuln/detail/CVE-2021-21393
- https://github.com/matrix-org/synapse/commit/3f58fc848d0002de4605bed91603a1f9f245d128
- https://github.com/matrix-org/synapse/commit/d2f0ec12d5c8f113095408888e87e191ac546499
- https://github.com/matrix-org/synapse
- https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2021-26.yaml
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY
- https://pypi.org/project/matrix-synapse
- Vector CVSS
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H- Debilidad (CWE)
CWE-20- Plataforma
- Python (PyPI)
- Paquete
matrix-synapse- Publicada
- 12.04.2021
- Actualizado
- 11.10.2026 13:19
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2021-26 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-jrh7-mhhx-6h88 - CC BY 4.0
Historial de vulnerabilidades: matrix-synapse
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 45
- Primera → última
- 03.2019 05.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 21
- Media 21
- Baja 3
Divulgaciones por año
- 2019: 3
- 2020: 3
- 2021: 12
- 2022: 7
- 2023: 9
- 2024: 7
- 2025: 2
- 2026: 2
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Denial of service (via resource exhaustion) due to improper input validation on groups/communities endpoints esta entrada
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