CVE-2026-23864

Multiple denial of service vulnerabilities exist in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack, react-server-dom-webpack. The vulnerabilities are triggered by sending specially crafted HTTP requests to Server Function endpoints, and could lead to server crashes, out-of-memory exceptions or excessive CPU usage; depending on the vulnerable code path being exercised, the application configuration and application code. Strongly consider upgrading to the latest package versions to reduce risk and prevent availability issues in applications using React Server Components.

Published: 2026-01-26 Last update: 2026-02-13 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-23864 is rated Moderate Risk (59.4/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.98%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-23864

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-28 1.92% 1.98% +0.06%
2 2026-05-22 1.11% 1.92% +0.82%
3 2026-05-21 — 1.11% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-23864

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-23864

GitHub Security Advisory for CVE-2026-23864

GHSA-83fc-fqcc-2hmg · Severity: high · Ecosystem: npm — React Server Components have multiple Denial of Service Vulnerabilities

OS Trackers for CVE-2026-23864

vendor priority summary link
redhat high — https://access.redhat.com/security/cve/CVE-2026-23864

Affected software / configurations for CVE-2026-23864

Vendor Product Version Raw CPE
facebook react >= 19.0.0, < 19.0.4 cpe:2.3:a:facebook:react:*:*:*:*:*:*:*:*
facebook react >= 19.1.0, < 19.1.5 cpe:2.3:a:facebook:react:*:*:*:*:*:*:*:*
facebook react >= 19.2.0, < 19.2.4 cpe:2.3:a:facebook:react:*:*:*:*:*:*:*:*

References for CVE-2026-23864

cvelogic Threat Intelligence