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Fencer Intel
medium 4.1

CVE-2024-42369 json

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

published 2y ago modified 4mo ago also EUVD-2024-2665 , GHSA-vhr5-g3pm-49fm

cvss
4.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm matrix-js-sdk 34.3.1
  • matrix javascript_sdk 34.3.1
  • element-desktop openSUSE Tumbleweed 1.11.75-1.1
  • element-web openSUSE Tumbleweed 1.11.75-1.1

opensuse advisories openSUSE-SU-2024:14288-1openSUSE-SU-2024:14289-1

Is CVE-2024-42369 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2y ago

Exploit prediction

0.48% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 4.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:L
GitHub 3.1 4.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:L
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
npm matrix-js-sdk
<34.3.1
34.3.1

Affected products

  • matrix-org matrix-js-sdk

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.