PyPI/matrix-synapse CVE-2021-29471: low 3.7, EPSS 1.65%

Denial of service attack via push rule patterns in matrix-synapse

Action: Upgrade matrix-synapse to 1.33.2 or later.

pip install matrix-synapse==1.33.2

Affected

Fixed versions

Sources

• osv: GHSA-x345-32rc-8h85
• https://github.com/matrix-org/synapse/security/advisories/GHSA-x345-32rc-8h85
• https://nvd.nist.gov/vuln/detail/CVE-2021-29471
• https://github.com/matrix-org/synapse/commit/03318a766cac9f8b053db2214d9c332a977d226c
• https://github.com/matrix-org/synapse
• https://github.com/matrix-org/synapse/releases/tag/v1.33.2
• https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2021-135.yaml
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY

CVE-2021-29471 · published 2021-05-13T20:22:51Z · modified 2026-07-08T06:27:40.962217171Z · JSON