CVE-2024-42369

mediumpriority · track · 21EPSS 0.005 · 41 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.48% (41st) EPSS

CVSS 5.3 · medium

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.14.1mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:Lsecondary · ENISA EU

v3.14.1mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:Lsecondary · security-advisories@github.comexploitability 2.3 · impact 1.4

v3.14.1mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:Lsecondary · OSV

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-674USprimaryCWE-674US

affected products (3)

Products and version ranges known to be affected.

matrix-org matrix-js-sdk≤ < 34.3.1enisa_euvdEU
matrix javascript sdk< 34.3.1nvdUScpe:2.3:a:matrix:javascript_sdk:*:*:*:*:*:*:*:*
npm matrix-js-sdk< 34.3.1osvUSpkg:npm/matrix-js-sdk

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-vhr5-g3pm-49fmmatrix-js-sdk will freeze when a user sets a room with itself as a its predecessor2024-08-20ghsa · osvUS
### 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](https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:L&version=3.1)) 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.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2024-08-20modified 2026-06-17

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references (8)

External citations — patches, advisories, analysis.

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