CVE-2025-55184: A pre-authentication denial of service vulnerability exists in React Server Components versions 19.0.0, 19.0.1 19.1.0…
- Is it exploited?
Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of .
VulnCheck KEV lists it since . It cites 3 public reports, the first from .
- How likely is exploitation in the next 30 days?
- 66.6%
Down from 66.9% on .
EPSS score, percentile 99.3 of all scored records. A probability estimated by FIRST, not a report of exploitation.
CISA's SSVC assessment in the CVE record lists exploitation as poc.
- How severe?
- 7.5 High
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA has set no required action, because the vulnerability is not in KEV.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- 19.0.0 through 19.0.1
- 19.1.0 through 19.1.2
- 19.2.0 through 19.2.1
- 19.0.0 through 19.0.1
- 19.1.0 through 19.1.2
- 19.2.0 through 19.2.1
and 3 more in the table below
Source: CISA KEV 2026.10.29, as of ; VulnCheck KEV, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.
Description
A pre-authentication denial of service vulnerability exists in React Server Components versions 19.0.0, 19.0.1 19.1.0, 19.1.1, 19.1.2, 19.2.0 and 19.2.1, including the following packages: react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack. The vulnerable code unsafely deserializes payloads from HTTP requests to Server Function endpoints, which can cause an infinite loop that hangs the server process and may prevent future HTTP requests from being served.
Source: CVE List, as of . About the data.
What to do
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.
Affected products and versions
Versions by product, as listed in the CVE record (3 products)
| Status | Versions |
|---|---|
| Affected | 19.0.0 through 19.0.1 |
| Affected | 19.1.0 through 19.1.2 |
| Affected | 19.2.0 through 19.2.1 |
Versions not listed are: unaffected.
| Status | Versions |
|---|---|
| Affected | 19.0.0 through 19.0.1 |
| Affected | 19.1.0 through 19.1.2 |
| Affected | 19.2.0 through 19.2.1 |
Versions not listed are: unaffected.
| Status | Versions |
|---|---|
| Affected | 19.0.0 through 19.0.1 |
| Affected | 19.1.0 through 19.1.2 |
| Affected | 19.2.0 through 19.2.1 |
Versions not listed are: unaffected.
Source: CVE List, as of . About the data.
Weakness
CWE-502
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| CVE record last updated |
References
2
Known exploited Meta vulnerabilities
- CVE-2025-55182: Meta React Server Components Remote Code Execution Vulnerability
- CVE-2025-55177: Meta Platforms WhatsApp Incorrect Authorization Vulnerability
- CVE-2019-18426: WhatsApp Cross-Site Scripting Vulnerability
- CVE-2019-3568: WhatsApp VOIP Stack Buffer Overflow Vulnerability