CVE-2025-55182 (GCVE-0-2025-55182)
Vulnerability from cvelistv5 – Published: 2025-12-03 15:40 – Updated: 2026-08-04 03:56Summary
A pre-authentication remote code execution vulnerability exists in React Server Components versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0 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.
Severity
10 (Critical)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-03 00:00 UTC
CWE
- Deserialization of Untrusted Data (CWE-502)
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://www.facebook.com/security/advisories/cve-… | x_refsource_CONFIRM |
| https://react.dev/blog/2025/12/03/critical-securi… | x_refsource_CONFIRM |
| https://aws.amazon.com/blogs/security/china-nexus… | media-coverage |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
| http://www.openwall.com/lists/oss-security/2025/12/03/4 | |
| https://news.ycombinator.com/item?id=46136026 |
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Meta | react-server-dom-webpack |
Affected:
19.0.0 , ≤ 19.0.0
(semver)
Affected: 19.1.0 , ≤ 19.1.1 (semver) Affected: 19.2.0 , ≤ 19.2.0 (semver) |
guessed | |
| Meta | react-server-dom-turbopack |
Affected:
19.0.0 , ≤ 19.0.0
(semver)
Affected: 19.1.0 , ≤ 19.1.1 (semver) Affected: 19.2.0 , ≤ 19.2.0 (semver) |
guessed | |
| Meta | react-server-dom-parcel |
Affected:
19.0.0 , ≤ 19.0.0
(semver)
Affected: 19.1.0 , ≤ 19.1.1 (semver) Affected: 19.2.0 , ≤ 19.2.0 (semver) |
guessed |
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 1f43fad9-d2bb-40b3-9a36-3648af93ab1a
Exploited: Yes
Timestamps
First Seen: 2025-12-05
Asserted: 2025-12-05
Scope
Notes: KEV entry: Meta React Server Components Remote Code Execution Vulnerability | Affected: Meta / React Server Components | Description: Meta React Server Components contains a remote code execution vulnerability that could allow unauthenticated remote code execution by exploiting a flaw in how React decodes payloads sent to React Server Function endpoints. Please note CVE-2025-66478 has been rejected, but it is associated with CVE-2025- 55182. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2025-12-12 | Known ransomware campaign use (KEV): Known | Notes (KEV): Check for signs of potential compromise on all internet accessible REACT instances after applying mitigations. For more information, please see: https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components ; https://github.com/vercel-labs/fix-react2shell-next?tab=readme-ov-file ; https://nvd.nist.gov/vuln/detail/CVE-2025-55182
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | React Server Components |
| Due Date | 2025-12-12 |
| Date Added | 2025-12-05 |
| Vendorproject | Meta |
| Vulnerabilityname | Meta React Server Components Remote Code Execution Vulnerability |
| Knownransomwarecampaignuse | Known |
References
Created: 2026-02-02 13:24 UTC
| Updated: 2026-02-06 07:53 UTC
ENISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: cab377b4-c238-496e-91b4-31502f83b4b9
Exploited: Yes
Timestamps
First Seen: 2026-04-08
Asserted: 2026-04-08
Scope
Notes: Affected: Meta / React Server Components | Description: Flaw in how React decodes payloads sent to React Server Function endpoints enabled unauthenticated remote code execution. Apps supporting React Server Components may still be vulnerable even if not implementing any React Server Function endpoints. | Exploitation type: APT | Threat actors: unknown | Origin source: cnw | Notes: https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components#update-instructions
Evidence
Type: Csirt Report
Signal: Successful Exploitation
Confidence: 75%
Source: enisa-cnw-kev
Details
| Cwes | - |
|---|---|
| Euvd | EUVD-2025-2009839 |
| Notes | https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components#update-instructions |
| Catalog | ENISA / EU CSIRTs Network (CNW) KEV JSON |
| Product | React Server Components |
| Datereported | 2026/04/08 |
| Originsource | cnw |
| Vendorproject | Meta |
| Exploitationtype | APT |
| Vulnerabilityname | - |
| Threatactorsexploiting | unknown |
References
Created: 2026-06-05 17:01 UTC
| Updated: 2026-06-05 17:01 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 9631ac58-d167-4442-921b-bdbce0f4fc15
Exploited: Yes
Characteristics
Severity:
100.0
Timestamps
First Seen: 2025-12-08
Asserted: 2025-12-08
Last Seen: 2026-09-07
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Meta / React Server Components | Class: web-app-framework | Severity: Critical (CVSS 10) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-09-07: 21026
Evidence
Type: Honeypot
Signal: In The Wild Attempts
Confidence: 70%
Source: shadowserver
Details
| 1D | 745 |
|---|---|
| Iot | no |
| Feed | Shadowserver Foundation honeypot/exploited-vulnerabilities |
| Type | http-scan |
| Class | web-app-framework |
| 7D Avg | 172 |
| Vendor | Meta |
| 30D Avg | 72 |
| 90D Avg | 100 |
| Product | React Server Components |
| Cisa Kev | yes |
| Connections | 21026 |
| Observation Date | 2026-09-07 |
| Vulnerability Class | CVSS |
| Vulnerability Score | 10 |
| Vulnerability Severity | Critical |
References
Created: 2026-07-01 05:53 UTC
| Updated: 2026-09-09 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: e3e00798-d5a6-4d7a-856b-c2a5bd2a3cb1
Exploited: Yes
Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: KEVIntel entry: A pre-authentication remote code execution vulnerability exists in React Server Components versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0 including... | Affected: Meta / react-server-dom-webpack, react-server-dom-turbopack, react-server-dom-parcel | CVSS: 10.0 (CRITICAL) | EPSS: 0.99562 | Used in malware: yes | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Confirmed Compromise
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | A pre-authentication remote code execution vulnerability exists in React Server Components versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0 including... |
| Vendor | Meta |
| Product | react-server-dom-webpack, react-server-dom-turbopack, react-server-dom-parcel |
| Added Date | 2026-06-01T00:00:00.000Z |
| Cvss Score | 10.0 |
| Epss Score | 0.99562 |
| Cvss Severity | CRITICAL |
| Epss Percentile | 0.99941 |
| Used In Malware | yes |
| Ahead Of Cisa Kev |
|
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-19 12:42 UTC
| Updated: 2026-06-19 12:42 UTC
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"status": "affected",
"version": "19.1.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "19.2.0",
"status": "affected",
"version": "19.2.0",
"versionType": "semver"
}
]
},
{
"defaultStatus": "unaffected",
"product": "react-server-dom-parcel",
"vendor": "Meta",
"versions": [
{
"lessThanOrEqual": "19.0.0",
"status": "affected",
"version": "19.0.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "19.1.1",
"status": "affected",
"version": "19.1.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "19.2.0",
"status": "affected",
"version": "19.2.0",
"versionType": "semver"
}
]
}
],
"dateAssigned": "2025-12-02T00:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "A pre-authentication remote code execution vulnerability exists in React Server Components versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0 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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 10,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "Deserialization of Untrusted Data (CWE-502)",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-12-11T20:15:37.699Z",
"orgId": "4fc57720-52fe-4431-a0fb-3d2c8747b827",
"shortName": "Meta"
},
"references": [
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://www.facebook.com/security/advisories/cve-2025-55182"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "4fc57720-52fe-4431-a0fb-3d2c8747b827",
"assignerShortName": "Meta",
"cveId": "CVE-2025-55182",
"datePublished": "2025-12-03T15:40:56.894Z",
"dateReserved": "2025-08-08T18:21:47.119Z",
"dateUpdated": "2026-08-04T03:56:01.281Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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