CVE-2026-23869: meta react-server-dom-parcel Uncontrolled Resource Consumption
Vulnerability summary
CVE-2026-23869 is a high (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in meta react-server-dom-parcel. EPSS estimates a 1.55% chance of exploitation in the next 30 days, higher than 74.7% of scored vulnerabilities.
Timeline
- 08-04-2026PublishedVulnerability first disclosed.
- 15-07-2026Last modifiedVulnerability information updated.
Description
A denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack and react-server-dom-webpack (versions 19.0.0 through 19.0.4, 19.1.0 through 19.1.5, and 19.2.0 through 19.2.4). The vulnerability is triggered by sending specially crafted HTTP requests to Server Function endpoints.The payload of the HTTP request causes excessive CPU usage for up to a minute ending in a thrown error that is catchable.
CVSS metrics
3 scores · 3 sources · 1 version- OSV · NpmEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
1.55%
Chance of exploitation in the next 30 days
Percentile
75%
Versus all other CVEs
30-day change
0.00 pp
From 1.55% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-400Uncontrolled Resource ConsumptionThe product does not properly control the allocation and maintenance of a limited resource.
- CWE-502Deserialization of Untrusted DataThe product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
- CWE-770Allocation of Resources Without Limits or ThrottlingThe product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
Affected systems
Meta3 products
- react-server-dom-parcel≥ 19.0.0, ≤ 19.0.4 | ≥ 19.1.0, ≤ 19.1.5 | ≥ 19.2.0, ≤ 19.2.4
- react-server-dom-turbopack≥ 19.0.0, ≤ 19.0.4 | ≥ 19.1.0, ≤ 19.1.5 | ≥ 19.2.0, ≤ 19.2.4
- react-server-dom-webpack≥ 19.0.0, ≤ 19.0.4 | ≥ 19.1.0, ≤ 19.1.5 | ≥ 19.2.0, ≤ 19.2.4
Npm3 products
- react-server-dom-parcel≥ 19.0.0, < 19.0.5 | ≥ 19.1.0, < 19.1.6 | ≥ 19.2.0, < 19.2.5
- react-server-dom-turbopack≥ 19.0.0, < 19.0.5 | ≥ 19.1.0, < 19.1.6 | ≥ 19.2.0, < 19.2.5
- react-server-dom-webpack≥ 19.0.0, < 19.0.5 | ≥ 19.1.0, < 19.1.6 | ≥ 19.2.0, < 19.2.5
2 vendors · 6 products
References
7 links
- github.com/facebook/reactPACKAGE