# CVE-2019-11340: PYSEC-2026-843 - Matrix Sydent mishandles emails

Source: https://junglewise.ai/threats/cve-2019-11340-matrix-sydent-mishandles-emails  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-06  
License: CC BY 4.0 with a link back

CVE-2019-11340 · Severity: low · CVSS 3 · Published 2026-07-06

Matrix Sydent mishandles emails

Technologies: [matrix-sydent (PyPI)](https://junglewise.ai/threats/technologies/matrix-sydent). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2019-11340 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2019-11340 being exploited in the wild.

**How severe is CVE-2019-11340?** Low severity, with a CVSS score of 3, published 6 July 2026.

**Which products and versions are affected?** matrix-sydent (PyPI) ECOSYSTEM:introduced=0,fixed=1.0.2.

**Is there a fix for CVE-2019-11340?** Yes. matrix-sydent (PyPI): upgrade to 1.0.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2019-11340?** Check whether you run matrix-sydent (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- matrix-sydent (PyPI): upgrade to 1.0.2 or later

  ```sh
  pip install "matrix-sydent>=1.0.2"
  ```


## Affected products

- matrix-sydent (PyPI) ECOSYSTEM:introduced=0,fixed=1.0.2

## Identifiers

- CVE-2019-11340
- GHSA-q9h8-gpw5-c95c
- PYSEC-2026-843

## Related threats

- [PYSEC-2026-2620 - matrix-sydent and matrix-synapse Use Cryptographically Weak PRNG](https://junglewise.ai/threats/cve-2019-11842-matrix-sydent-and-matrix-synapse-use-cryptographically-weak-prng)
- [Sydent does not verify email server certificates](https://junglewise.ai/threats/cve-2023-38686-sydent-does-not-verify-email-server-certificates)
- [SSRF in Sydent due to missing validation of hostnames](https://junglewise.ai/threats/cve-2021-29431-ssrf-in-sydent-due-to-missing-validation-of-hostnames)
- [Malicious users could abuse Sydent to control the content of invitation emails](https://junglewise.ai/threats/cve-2021-29432-malicious-users-could-abuse-sydent-to-control-the-content-of)
- [Sydent vulnerable to denial of service attack via memory exhaustion](https://junglewise.ai/threats/cve-2021-29430-sydent-vulnerable-to-denial-of-service-attack-via-memory)