PYSEC-2026-1611

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Import Source

https://github.com/pypa/advisory-database/blob/main/vulns/matrix-synapse/PYSEC-2026-1611.yaml

JSON Data

https://api.osv.dev/v1/vulns/PYSEC-2026-1611

Aliases

Published

2026-07-07T14:34:46.390890Z

Modified

2026-07-07T17:47:03.469944876Z

Severity

8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator

Summary

Synapse allows a a malformed invite to break the invitee's `/sync`

Details

Impact

Synapse versions before 1.120.1 fail to properly validate invites received over federation. This vulnerability allows a malicious server to send a specially crafted invite that disrupts the invited user's /sync functionality.

Patches

Synapse 1.120.1 rejects such invalid invites received over federation and restores the ability to sync for affected users.

Workarounds

Server administrators can disable federation from untrusted servers.

For more information

If you have any questions or comments about this advisory, please email us at security at element.io.

References

Affected packages

PyPI / matrix-synapse

Package

Name: matrix-synapse; View open source insights on deps.dev
Purl: pkg:pypi/matrix-synapse

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.120.1

Affected versions

0.*

0.33.5

0.33.5.1

0.33.6rc1

0.33.6

0.33.7rc1

0.33.7rc2

0.33.7

0.33.8rc2

0.33.8

0.33.9

0.34.0rc1

0.34.0rc2

0.34.0

0.34.0.1

0.34.1.1

0.99.0rc1

0.99.0rc2

0.99.0rc3

0.99.0rc4

0.99.0

0.99.1rc1

0.99.1rc2

0.99.1

0.99.1.1

0.99.2rc1

0.99.2

0.99.3rc1

0.99.3

0.99.3.1

0.99.3.2

0.99.4rc1

0.99.4

0.99.5rc1

0.99.5

0.99.5.1

0.99.5.2

1.*

1.0.0rc1

1.0.0rc2

1.0.0rc3

1.0.0

1.1.0rc1

1.1.0rc2

1.1.0

1.2.0rc1

1.2.0rc2

1.2.0

1.2.1

1.3.0rc1

1.3.0

1.3.1

1.4.0rc1

1.4.0rc2

1.4.0

1.4.1rc1

1.4.1

1.5.0rc1

1.5.0rc2

1.5.0

1.5.1

1.6.0rc1

1.6.0rc2

1.6.0

1.6.1

1.7.0rc1

1.7.0rc2

1.7.0

1.7.1

1.7.2

1.7.3

1.8.0rc1

1.8.0

1.9.0.dev1

1.9.0.dev2

1.9.0rc1

1.9.0

1.9.1

1.10.0rc1

1.10.0rc2

1.10.0rc3

1.10.0rc5

1.10.0

1.10.1

1.11.0rc1

1.11.0

1.11.1

1.12.0rc1

1.12.0

1.12.1rc1

1.12.1

1.12.2

1.12.3

1.12.4rc1

1.12.4

1.13.0rc1

1.13.0rc2

1.13.0rc3

1.13.0

1.14.0rc1

1.14.0rc2

1.14.0

1.15.0rc1

1.15.0

1.15.1

1.15.2

1.16.0rc1

1.16.0rc2

1.16.0

1.16.1

1.17.0rc1

1.17.0

1.18.0rc1

1.18.0rc2

1.18.0

1.19.0rc1

1.19.0

1.19.1rc1

1.19.1

1.19.2

1.19.3

1.20.0rc1

1.20.0rc2

1.20.0rc3

1.20.0rc4

1.20.0rc5

1.20.0

1.20.1

1.21.0rc1

1.21.0rc2

1.21.0rc3

1.21.0

1.21.1

1.21.2

1.22.0rc1

1.22.0rc2

1.22.0

1.22.1

1.23.0rc1

1.23.0

1.23.1

1.24.0rc1

1.24.0rc2

1.24.0

1.25.0rc1

1.25.0

1.26.0rc1

1.26.0rc2

1.26.0

1.27.0rc1

1.27.0rc2

1.27.0

1.28.0rc1

1.28.0

1.29.0rc1

1.29.0

1.30.0rc1

1.30.0

1.30.1

1.31.0rc1

1.31.0

1.32.0rc1

1.32.0

1.32.1

1.32.2

1.33.0rc1

1.33.0rc2

1.33.0

1.33.1

1.33.2

1.34.0rc1

1.34.0

1.35.0rc1

1.35.0rc2

1.35.0rc3

1.35.0

1.35.1

1.36.0rc1

1.36.0rc2

1.36.0

1.37.0rc1

1.37.0

1.37.1rc1

1.37.1

1.38.0rc1

1.38.0rc2

1.38.0rc3

1.38.0

1.38.1

1.39.0rc1

1.39.0rc2

1.39.0rc3

1.39.0

1.40.0rc1

1.40.0rc2

1.40.0rc3

1.40.0

1.41.0rc1

1.41.0

1.41.1

1.42.0rc1

1.42.0rc2

1.42.0

1.43.0rc1

1.43.0rc2

1.43.0

1.44.0rc1

1.44.0rc2

1.44.0rc3

1.44.0

1.45.0rc1

1.45.0rc2

1.45.0

1.45.1

1.46.0rc1

1.46.0

1.47.0rc1

1.47.0rc2

1.47.0rc3

1.47.0

1.47.1

1.48.0rc1

1.48.0

1.49.0rc1

1.49.0

1.49.2

1.50.0rc1

1.50.0rc2

1.50.0

1.50.1

1.50.2

1.51.0rc1

1.51.0rc2

1.51.0

1.52.0rc1

1.52.0

1.53.0rc1

1.53.0

1.54.0rc1

1.54.0

1.55.0rc1

1.55.0

1.55.1

1.55.2

1.56.0rc1

1.56.0

1.57.0rc1

1.57.0

1.57.1

1.58.0rc2

1.58.0

1.58.1

1.59.0rc1

1.59.0rc2

1.59.0

1.59.1

1.60.0rc1

1.60.0rc2

1.60.0

1.61.0rc1

1.61.0

1.61.1

1.62.0rc1

1.62.0rc2

1.62.0rc3

1.62.0

1.63.0rc1

1.63.0

1.63.1

1.64.0rc1

1.64.0rc2

1.64.0

1.65.0rc1

1.65.0rc2

1.65.0

1.66.0rc1

1.66.0rc2

1.66.0

1.67.0rc1

1.67.0

1.68.0rc1

1.68.0rc2

1.68.0

1.69.0rc1

1.69.0rc2

1.69.0rc4

1.69.0

1.70.0rc1

1.70.0rc2

1.70.0

1.70.1

1.71.0rc1

1.71.0rc2

1.71.0

1.72.0rc1

1.72.0

1.73.0rc2

1.73.0

1.74.0rc1

1.74.0

1.75.0rc1

1.75.0rc2

1.75.0

1.76.0rc1

1.76.0rc2

1.76.0

1.77.0rc1

1.77.0rc2

1.77.0

1.78.0rc1

1.78.0

1.79.0rc1

1.79.0rc2

1.79.0

1.80.0rc1

1.80.0rc2

1.80.0

1.81.0rc1

1.81.0rc2

1.81.0

1.82.0rc1

1.82.0

1.83.0rc1

1.83.0

1.84.0rc1

1.84.0

1.84.1

1.85.0rc1

1.85.0rc2

1.85.0

1.85.1

1.85.2

1.86.0rc2

1.86.0

1.87.0rc1

1.87.0

1.88.0rc1

1.88.0

1.89.0rc1

1.89.0

1.90.0rc1

1.90.0

1.91.0rc1

1.91.0

1.91.1

1.91.2

1.92.0rc1

1.92.1

1.92.2

1.92.3

1.93.0rc1

1.93.0

1.94.0rc1

1.94.0

1.95.0rc1

1.95.0

1.95.1

1.96.0rc1

1.96.1

1.97.0rc1

1.97.0

1.98.0rc1

1.98.0

1.99.0rc1

1.99.0

1.100.0rc2

1.100.0rc3

1.100.0

1.101.0rc1

1.101.0

1.102.0rc1

1.102.0

1.103.0rc1

1.103.0

1.104.0rc1

1.104.0

1.105.0rc1

1.105.0

1.105.1

1.106.0rc1

1.106.0

1.107.0rc1

1.107.0

1.108.0rc1

1.108.0

1.109.0rc1

1.109.0rc2

1.109.0rc3

1.109.0

1.110.0rc2

1.110.0rc3

1.110.0

1.111.0rc1

1.111.0rc2

1.111.0

1.111.1

1.112.0rc1

1.112.0

1.113.0rc1

1.113.0

1.114.0rc1

1.114.0rc3

1.114.0

1.115.0rc1

1.115.0rc2

1.115.0

1.116.0rc1

1.116.0rc2

1.116.0

1.117.0rc1

1.117.0

1.118.0rc1

1.118.0

1.119.0rc2

1.119.0

1.120.0rc1

1.120.0

Database specific

source

"https://github.com/pypa/advisory-database/blob/main/vulns/matrix-synapse/PYSEC-2026-1611.yaml"