Exploitation evidence
Known exploited · CISA KEV listed
Added 2025-12-05. Ransomware campaign use: Known.
CISA 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.
CISA due date: 2025-12-12. This is the catalog’s deadline, not an assessment of your organization’s exposure.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
Meta / react-server-dom-webpack
Default status: unaffected
- affected: 19.0.0 to ≤ 19.0.0 (semver)
- affected: 19.1.0 to ≤ 19.1.1 (semver)
- affected: 19.2.0 to ≤ 19.2.0 (semver)
Meta / react-server-dom-turbopack
Default status: unaffected
- affected: 19.0.0 to ≤ 19.0.0 (semver)
- affected: 19.1.0 to ≤ 19.1.1 (semver)
- affected: 19.2.0 to ≤ 19.2.0 (semver)
Meta / react-server-dom-parcel
Default status: unaffected
- affected: 19.0.0 to ≤ 19.0.0 (semver)
- affected: 19.1.0 to ≤ 19.1.1 (semver)
- affected: 19.2.0 to ≤ 19.2.0 (semver)
Fixes and workarounds
No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.
Sources and related reporting
CVE Program record ↗ · Download tracked evidence as JSON
- https://www.facebook.com/security/advisories/cve-2025-55182
- https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components
- https://aws.amazon.com/blogs/security/china-nexus-cyber-threat-groups-rapidly-exploit-react2shell-vulnerability-cve-2025-55182/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55182
- http://www.openwall.com/lists/oss-security/2025/12/03/4
- https://news.ycombinator.com/item?id=46136026
Monitored source mentions
Shared CVE identifiers link source mentions; they do not establish that the reports describe the same incident.
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.99731,
"percentile": 0.99953
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.99731,
"percentile": 0.99953
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.99731,
"percentile": 0.99953
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.99731,
"percentile": 0.99952
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.99731,
"percentile": 0.99953
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.99731,
"percentile": 0.99953
}06 Nov 2026, 06:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.99731,
"percentile": 0.99953
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.99731,
"percentile": 0.99953
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.99731,
"percentile": 0.99953
}03 Nov 2026, 18:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2025-55182",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-04T03:56:02.696515Z",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2025-12-05",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55182"
},
"type": "kev"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-502",
"description": "CWE-502 Deserialization of Untrusted Data",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-07T17:58:00.859Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
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"references": [
{
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"media-coverage"
],
"url": "https://aws.amazon.com/blogs/security/china-nexus-cyber-threat-groups-rapidly-exploit-react2shell-vulnerability-cve-2025-55182/"
},
{
"tags": [
"government-resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55182"
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],
"title": "CISA ADP Vulnrichment"
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{
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"dateUpdated": "2025-12-04T17:32:12.884Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"references": [
{
"url": "http://www.openwall.com/lists/oss-security/2025/12/03/4"
},
{
"url": "https://news.ycombinator.com/item?id=46136026"
}
],
"title": "CVE Program Container",
"x_generator": {
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],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "react-server-dom-webpack",
"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"
}
]
},
{
"defaultStatus": "unaffected",
"product": "react-server-dom-turbopack",
"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"
}
]
},
{
"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": [
{
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}
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}
],
"problemTypes": [
{
"descriptions": [
{
"description": "Deserialization of Untrusted Data (CWE-502)",
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]
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],
"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"
},
{
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],
"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": "2026-10-07T17:58:00.859Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.99802,
"percentile": 0.99958
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2025-55182",
"cwes": [],
"dateAdded": "2025-12-05",
"dueDate": "2025-12-12",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Known",
"notes": "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",
"product": "React Server Components",
"requiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
"shortDescription": "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.",
"vendorProject": "Meta",
"vulnerabilityName": "Meta React Server Components Remote Code Execution Vulnerability"
}