CVE-2019-11340

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.

• CWE-20

• https://github.com/matrix-org/sydent/commit/4e1cfff53429c49c87d5c457a18ed435520044fcPatch, Third Party Advisory
• https://github.com/matrix-org/sydent/compare/7c002cd...09278fbPatch, Third Party Advisory
• https://matrix.org/blog/2019/04/18/security-update-sydent-1-0-2/Release Notes, Vendor Advisory
• https://twitter.com/matrixdotorg/status/1118934335963500545Third Party Advisory
• https://github.com/matrix-org/sydent/commit/4e1cfff53429c49c87d5c457a18ed435520044fcPatch, Third Party Advisory
• https://github.com/matrix-org/sydent/compare/7c002cd...09278fbPatch, Third Party Advisory
• https://matrix.org/blog/2019/04/18/security-update-sydent-1-0-2/Release Notes, Vendor Advisory
• https://twitter.com/matrixdotorg/status/1118934335963500545Third Party Advisory

Published

Apr 19, 2019

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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