MEDIUM 5.9
PYSEC-2026-843
Matrix Sydent mishandles emails
Details
util/emailutils.py in Matrix Sydent before 1.0.2 mishandles registration restrictions that are based on e-mail domain, if the allowed_local_3pids option is enabled. This occurs because of potentially unwanted behavior in Python, in which an email.utils.parseaddr call on user@bad.example.net@good.example.com returns the user@bad.example.net substring.
Are you affected?
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Affected packages
PyPI / matrix-sydent
Introduced in:
0 Fixed in: 1.0.2 Fix
pip install --upgrade 'matrix-sydent>=1.0.2' References
- https://nvd.nist.gov/vuln/detail/CVE-2019-11340 [ADVISORY]
- https://github.com/matrix-org/sydent/commit/4e1cfff53429c49c87d5c457a18ed435520044fc [WEB]
- https://github.com/matrix-org/sydent/compare/7c002cd...09278fb [WEB]
- https://matrix.org/blog/2019/04/18/security-update-sydent-1-0-2 [WEB]
- https://twitter.com/matrixdotorg/status/1118934335963500545 [WEB]
- https://pypi.org/project/matrix-sydent [PACKAGE]
- https://github.com/advisories/GHSA-q9h8-gpw5-c95c [ADVISORY]