Medium severity4.3NVD Advisory· Published Apr 15, 2021· Updated Jun 17, 2026
CVE-2021-29433
CVE-2021-29433
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
matrix-sydentPyPI | < 2.3.0 | 2.3.0 |
Affected products
3cpe:2.3:a:matrix:sydent:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:matrix:sydent:*:*:*:*:*:*:*:*range: <2.3.0
- (no CPE)range: <= 2.2.0
Patches
Vulnerability mechanics
References
6- github.com/matrix-org/sydent/commit/3175fd358ebc2c310eab7a3dbf296ce2bd54c1danvdPatchThird Party AdvisoryWEB
- github.com/matrix-org/sydent/security/advisories/GHSA-pw4v-gr34-2553nvdPatchThird Party AdvisoryWEB
- github.com/advisories/GHSA-pw4v-gr34-2553ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2021-29433ghsaADVISORY
- github.com/pypa/advisory-database/tree/main/vulns/matrix-sydent/PYSEC-2021-24.yamlghsaWEB
- pypi.org/project/matrix-sydentghsaWEB
News mentions
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