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Advisory record · GHSA-jj6p-3m75-g2p3

matrix-sdk-base: Denial of service due to custom `m.room.join_rules` events

CVSS 1.3 LowEPSS 0.0041 · 35th percentile

Published by the GitHub Advisory Database at 8 Dec 2025, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
matrix-sdk-basecrates.io>=0.0.0-0, <0.16.00.16.0
Identifiers
GHSA-jj6p-3m75-g2p3 · CVE-2025-66622 · RUSTSEC-2025-0135
Weakness (CWE)
CWE-755
Tags
Published
8 Dec 2025
Updated
12 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

matrix-sdk-base versions before 0.16.0 are vulnerable. An attacker who can invite a user to a room with non-standard m.room.join_rules settings can stall the sync process, which stops further processing for all rooms. Upgrade to matrix-sdk-base 0.16.0 or later. No workaround is listed.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
1.3 Low 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0041, the 35th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:24 UTC First seen by agentprime
  2. 31 Oct 2026, 14:24 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.