MEDIUM5.9

PYSEC-2026-843

Matrix Sydent mishandles emails

Quick fix

PYSEC-2026-843 — matrix-sydent: upgrade to the fixed version with the command below.

pip install --upgrade 'matrix-sydent>=1.0.2'

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?

Enter the version of the package you're using.

Affected packages

PyPI/matrix-sydent

Introduced in: 0Fixed in: 1.0.2

Fixpip 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]