GHSA-XQC2-XF4C-X3H3
Vulnerability from github – Published: 2026-11-10 22:44 – Updated: 2026-11-10 22:44Impact
Crafted payloads targeting frameworks supporting React Server Components can lead to remote code execution. This only affects extremely rare cases where responses transport multiple typed arrays and an attacker-controlled value.
Updating immediately is recommended.
The vulnerability exists in versions 19.0.0 through 19.0.8, 19.1.0 through 19.1.9, 19.2.0 through 19.2.8 and 19.3.0 of:
- react-server-dom-webpack
- react-server-dom-parcel
- react-server-dom-turbopack
Patches
Fixes were back ported to versions 19.0.09, 19.1.10, 19.2.9, and 19.3.1.
If applications are using any of the above packages please upgrade to any of the fixed versions immediately.
If an app’s React code does not use a server, the app is not affected by this vulnerability. If an app does not use a framework, bundler, or bundler plugin that supports React Server Components, the app is not affected by this vulnerability.
{
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "react-server-dom-parcel"
},
"ranges": [
{
"events": [
{
"introduced": "19.0.0"
},
{
"fixed": "19.0.9"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "npm",
"name": "react-server-dom-parcel"
},
"ranges": [
{
"events": [
{
"introduced": "19.1.0"
},
{
"fixed": "19.1.10"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "npm",
"name": "react-server-dom-parcel"
},
"ranges": [
{
"events": [
{
"introduced": "19.2.0"
},
{
"fixed": "19.2.9"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "npm",
"name": "react-server-dom-parcel"
},
"ranges": [
{
"events": [
{
"introduced": "19.3.0"
},
{
"fixed": "19.3.1"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "npm",
"name": "react-server-dom-turbopack"
},
"ranges": [
{
"events": [
{
"introduced": "19.0.0"
},
{
"fixed": "19.0.9"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "npm",
"name": "react-server-dom-turbopack"
},
"ranges": [
{
"events": [
{
"introduced": "19.1.0"
},
{
"fixed": "19.1.10"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "npm",
"name": "react-server-dom-turbopack"
},
"ranges": [
{
"events": [
{
"introduced": "19.2.0"
},
{
"fixed": "19.2.9"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "npm",
"name": "react-server-dom-turbopack"
},
"ranges": [
{
"events": [
{
"introduced": "19.3.0"
},
{
"fixed": "19.3.1"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "npm",
"name": "react-server-dom-webpack"
},
"ranges": [
{
"events": [
{
"introduced": "19.0.0"
},
{
"fixed": "19.0.9"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "npm",
"name": "react-server-dom-webpack"
},
"ranges": [
{
"events": [
{
"introduced": "19.1.0"
},
{
"fixed": "19.1.10"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "npm",
"name": "react-server-dom-webpack"
},
"ranges": [
{
"events": [
{
"introduced": "19.2.0"
},
{
"fixed": "19.2.9"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "npm",
"name": "react-server-dom-webpack"
},
"ranges": [
{
"events": [
{
"introduced": "19.3.0"
},
{
"fixed": "19.3.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-126187"
],
"database_specific": {
"cwe_ids": [
"CWE-502"
],
"github_reviewed": true,
"github_reviewed_at": "2026-11-10T22:44:12Z",
"nvd_published_at": null,
"severity": "CRITICAL"
},
"details": "### Impact\n\nCrafted payloads targeting frameworks supporting React Server Components can lead to remote code execution. This only affects extremely rare cases where responses transport multiple typed arrays and an attacker-controlled value.\n\nUpdating immediately is recommended.\n\nThe vulnerability exists in versions 19.0.0 through 19.0.8, 19.1.0 through 19.1.9, 19.2.0 through 19.2.8 and 19.3.0 of:\n\n- react-server-dom-webpack\n- react-server-dom-parcel\n- react-server-dom-turbopack\n\n### Patches\n\nFixes were back ported to versions 19.0.09, 19.1.10, 19.2.9, and 19.3.1.\n\nIf applications are using any of the above packages please upgrade to any of the fixed versions immediately.\n\nIf an app\u2019s React code does not use a server, the app is not affected by this vulnerability. If an app does not use a framework, bundler, or bundler plugin that supports React Server Components, the app is not affected by this vulnerability.",
"id": "GHSA-xqc2-xf4c-x3h3",
"modified": "2026-11-10T22:44:12Z",
"published": "2026-11-10T22:44:12Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/react/react/security/advisories/GHSA-xqc2-xf4c-x3h3"
},
{
"type": "WEB",
"url": "https://github.com/react/react/pull/37842"
},
{
"type": "WEB",
"url": "https://github.com/react/react/pull/37843"
},
{
"type": "WEB",
"url": "https://github.com/react/react/pull/37844"
},
{
"type": "WEB",
"url": "https://github.com/react/react/pull/37845"
},
{
"type": "WEB",
"url": "https://github.com/react/react/pull/37846"
},
{
"type": "WEB",
"url": "https://github.com/react/react/commit/0c9913ae87283f96e868a8f1c20a3389827632d0"
},
{
"type": "WEB",
"url": "https://github.com/react/react/commit/249ac87b0dadea4ba024d1393e5cb60cf1186080"
},
{
"type": "WEB",
"url": "https://github.com/react/react/commit/3d06b4005ac0cf9dec37267f26174adfe6d83611"
},
{
"type": "WEB",
"url": "https://github.com/react/react/commit/611d9217df39cf7b8ac91b2e41fd00555923e904"
},
{
"type": "WEB",
"url": "https://github.com/react/react/commit/61aa00df822d0eb76d0362eb8b6fdd3527693efe"
},
{
"type": "PACKAGE",
"url": "https://github.com/react/react"
},
{
"type": "WEB",
"url": "https://github.com/react/react/releases/tag/v19.0.9"
},
{
"type": "WEB",
"url": "https://github.com/react/react/releases/tag/v19.1.10"
},
{
"type": "WEB",
"url": "https://github.com/react/react/releases/tag/v19.2.9"
},
{
"type": "WEB",
"url": "https://github.com/react/react/releases/tag/v19.3.1"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:N",
"type": "CVSS_V4"
}
],
"summary": "React: Unauthenticated Remote Code Execution in React Server Components"
}
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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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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.