CVE-2024-42369
A room with itself as a its predecessor will freeze matrix-js-sdk
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
A room with itself as a its predecessor will freeze matrix-js-sdk
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.
- Record
CVE-2024-42369- CVSS 3.1
- 4.1 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:L - Weakness
- CWE-674
- Updated
- 2026-11-02
EUVDEUVD-2024-2665
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.
- Record
EUVD-2024-2665- CVSS 3.1
- 4.1 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:L - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-vhr5-g3pm-49fm
matrix-js-sdk will freeze when a user sets a room with itself as a its predecessor
Impact
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.
Even if the CVSS score would be 4.1 (AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:L) we classify this as High severity issue.
Patches
This was patched in matrix-js-sdk 34.3.1.
Workarounds
Sanity check rooms before passing them to the matrix-js-sdk or avoid calling either getRoomUpgradeHistory or leaveRoomChain.
References
N/A.
- Record
GHSA-vhr5-g3pm-49fm- CVSS 4.0
- 5.1 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L - CVSS 3.1
- 4.1 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:L - Weakness
- CWE-674
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2024-42369- CVSS 3.1
- 4.1 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:L - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-674
- Updated
- 2026-11-02
OSV
A room with itself as a its predecessor will freeze matrix-js-sdk
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.
- Record
CVE-2024-42369- CVSS 3.1
- 4.1 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:L - Weakness
- CWE-674
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2024-42369
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.
- Record
DEBIAN-CVE-2024-42369- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
Show 4 moreShow less
OSVGHSA-vhr5-g3pm-49fm
matrix-js-sdk will freeze when a user sets a room with itself as a its predecessor
Impact
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.
Even if the CVSS score would be 4.1 (AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:L) we classify this as High severity issue.
Patches
This was patched in matrix-js-sdk 34.3.1.
Workarounds
Sanity check rooms before passing them to the matrix-js-sdk or avoid calling either getRoomUpgradeHistory or leaveRoomChain.
References
N/A.
- Record
GHSA-vhr5-g3pm-49fm- CVSS 4.0
- 5.1 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L - CVSS 3.1
- 4.1 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:L - Weakness
- CWE-674
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2024-42369
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.
- Record
UBUNTU-CVE-2024-42369- CVSS 3.1
- 4.1 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:L - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
OSVopenSUSE-SU-2024:14288-1 No score
element-desktop-1.11.75-1.1 on GA media
These are all security issues fixed in the element-desktop-1.11.75-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:14288-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:14289-1 No score
element-web-1.11.75-1.1 on GA media
These are all security issues fixed in the element-web-1.11.75-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:14289-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
matrix-js-sdknpm |
before 34.3.1 | 34.3.1 |
node-matrix-js-sdkDebian:11 |
All versions, plus listed versions 9.11.0+~cs9.9.16-19.11.0+~cs9.9.16-29.3.0+~cs9.9.16-29.7.0~~rc1+~cs9.9.16-19.7.0~~rc1+~cs9.9.16-2 |
None known |
node-matrix-js-sdkUbuntu:20.04:LTS |
All versions, plus listed versions 0.9.2-1 |
None known |
node-matrix-js-sdkUbuntu:22.04:LTS |
All versions, plus listed versions 9.3.0+~cs9.9.16-29.11.0+~cs9.9.16-1 |
None known |
node-matrix-js-sdkUbuntu:24.04:LTS |
All versions, plus listed versions 9.11.0+~cs9.9.16-2 |
None known |
element-desktopopenSUSE:Tumbleweed |
before 1.11.75-1.1 | 1.11.75-1.1 |
element-webopenSUSE:Tumbleweed |
before 1.11.75-1.1 | 1.11.75-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2024-42369 is a medium vulnerability (CVSS 4.1) in Matrix-org Matrix-js-sdk, published August 20, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.48%, the 41st percentile. Fixed in matrix-js-sdk 34.3.1.
References
github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-vhr5-g3pm-49fm
nvd.nist.gov/vuln/detail/CVE-2024-42369
security-tracker.debian.org/tracker/CVE-2024-42369