CVE-2024-42369

A room with itself as a its predecessor will freeze matrix-js-sdk

MEDIUM
5.3
CVSS Score
Published: August 20, 2024 at 02:37 PM UTC
Updated: June 17, 2026 at 07:49 AM UTC
2 products affected across 2 vendorsJavaScript SDKJavaScript SDK

Using matrix-js-sdk by matrix-org?

Get instant alerts when new vulnerabilities affect matrix-js-sdk - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Severity
MEDIUM5.3
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

matrix-js-sdk is a Matrix messaging protocol Client-Server SDK for JavaScript. A malicious homeserver can craft a room or room structure such that the predecessors form a cycle. The matrix-js-sdk's getRoomUpgradeHistory function will infinitely recurse in this case, causing the code to hang. This method is public but also called by the 'leaveRoomChain()' method, so leaving a room will also trigger the bug. This was patched in matrix-js-sdk 34.3.1.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 34.3.1
Affected range stops below 34.3.1, so it looks safe — our inference, not a vendor statement
v < 34.3.1
Affected range stops below 34.3.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusANALYZED
CWE
CWE-674

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Free plan, no card