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Vulnerabilities

Security fix · CVE-2025-66622

matrix-sdk-base is the base component to build a Matrix client library.

Published Dec 9, 2025 · catalog updated Dec 9, 2025 · matrix-sdk-base is the base

Last checked Nov 2, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-66622. EPSS is 0.41%. Act only if a listed version of matrix-sdk-base is the base is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (matrix-sdk-base is the base).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Low1.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.41%
Remediation
Version ranges on file
Affected products
vendor matrix-org matrix-rust-sdk < 0.16.0

matrix-sdk-base is the base component to build a Matrix client library. Versions 0.14.1 and prior are unable to handle responses that include custom m.room.join_rules values due to a serialization bug. This can be exploited to cause a denial-of-service condition, if a user is invited to a room with non-standard join rules, the crate's sync process will stall, preventing further processing for all rooms. This is fixed in version 0.16.0.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor matrix-org matrix-rust-sdk < 0.16.0< 0.16.0

How to fix CVE-2025-66622

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-66622. EPSS is 0.41%. Act only if a listed version of matrix-sdk-base is the base is installed.

Which versions are affected?

Compare what you have installed with matrix-org matrix-rust-sdk < 0.16.0 < 0.16.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.41%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 9, 2025 · EUVD

    Detected

    matrix-sdk-base is the base component to build a Matrix client library. Versions 0.14.1 and prior are unable to handle responses that include custom m.room.join_rules values due to a serialization bug. This can be exploited to cause a denial-of-service condition, if a user is invited to a room with non-standard join rules, the crate's sync process will stall, preventing further processing for all

  2. Dec 9, 2025 · EUVD

    Updated

    matrix-sdk-base is the base component to build a Matrix client library. Versions 0.14.1 and prior are unable to handle responses that include custom m.room.join_rules values due to a serialization bug. This can be exploited to cause a denial-of-service condition, if a user is invited to a room with non-standard join rules, the crate's sync process will stall, preventing further processing for all

Sources

  • CVE.orgVulnerability recordCVE-2025-66622

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-66622

    30-day exploitation probability 0.41%

    first.org
  • EUVDVulnerability recordEUVD-2025-201827

    matrix-sdk-base is the base component to build a Matrix client library. Versions 0.14.1 and prior are unable to handle responses that include custom m.room.join_rules values due to a serialization bug. This can be exploited to cause a denial-of-service condition, if a user is inv

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 2, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 2, 2026
  • CVE.orgOct 27, 2026
  • EUVDOct 27, 2026