CVE-2025-4727 json
Meteor livedata_server.js Object.assign redos
published 2025-05-15 17 mo ago modified 2026-06-17 4 mo ago also GHSA-j3v9-6gc7-vf5f , EUVD-2025-15378
- cvss
- 3.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 60%
- public exploits
- 0
- none known
Summary
A vulnerability was found in Meteor up to 3.2.1 and classified as problematic. This issue affects the function Object.assign of the file packages/ddp-server/livedata_server.js. The manipulation of the argument forwardedFor leads to inefficient regular expression complexity. The attack may be initiated remotely. The complexity of an attack is rather high. The exploitation is known to be difficult. The exploit has been disclosed to the public and may be used. Upgrading to version 3.2.2 is able to address this issue. The identifier of the patch is f7ea6817b90952baaea9baace2a3b4366fee6a63. It is recommended to upgrade the affected component.
Patch / fix
- meteor meteor 3.2.2
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 17 mo ago
Exploit prediction
0.92% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- vuldb.com https://vuldb.com/?submit.570441 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.3 | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N |
| CNA | 3.1 | 3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L |
| CNA | 3.0 | 3.7 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L |
| CNA | 2.0 | 2.6 | AV:N/AC:H/Au:N/C:N/I:N/A:P |
| CNA | 4.0 | 6.3 | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| GitHub | 3.1 | 3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | meteor | <=3.2.1 |
no fix listed |
Affected products
- n/a Meteor
Classification
References
-
github.com
/meteor/meteor/pull/13721
issue-tracking, web, patch
-
github.com
/meteor/meteor/commit/f7ea6817b90952baaea9baace2a3b4366fee6a63
patch, web, issue-tracking
-
github.com
/meteor/meteor/releases/tag/release/METEOR%403.2.2
patch, web, release-notes
-
vuldb.com
/?submit.570441
third-party-advisory, exploit, web, vdb-entry
-
vuldb.com
/?id.309029
vdb-entry, technical-description, web, third-party-advisory
-
vuldb.com
/?ctiid.309029
signature, permissions-required, web, vdb-entry
-
github.com
/meteor/meteor/issues/13713
issue-tracking, web, broken-link
-
nvd.nist.gov
/vuln/detail/CVE-2025-4727
advisory
-
github.com
/meteor/meteor
package
Sources
- CVE List CVE-2025-4727
- GitHub Advisory GHSA-j3v9-6gc7-vf5f
- NVD CVE-2025-4727
Fencer Vulns 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.