High

Denial of Service in React Server Components unsafe deserialization

IdentifiersCVE-2025-67779CWE-502· Deserialization of Untrusted Data

CVE-2025-67779 is a high-severity denial-of-service vulnerability in React Server Components caused by an incomplete fix for CVE-2025-55184. The flaw affects the React Server Components deserialization path in react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack. In affected versions 19.0.2, 19.1.3, and 19.2.2, a specially crafted HTTP payload sent to a Server Function endpoint can be unsafely deserialized and trigger an infinite loop, hanging the server process. This can prevent the application from serving subsequent HTTP requests. The issue is limited to server-side React Server Components usage and does not affect client-only React applications.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation causes denial of service by forcing the vulnerable server process into an infinite loop during request deserialization. This can hang the process, consume CPU, and prevent future HTTP requests from being served until the process is restarted or otherwise recovers. The impact is on availability; the provided content does not indicate confidentiality or integrity impact for this CVE.

Mitigation

If you can’t patch tonight, do this now.

There is no complete workaround described beyond upgrading. Reduce exposure by limiting access to Server Function endpoints and applying any vendor-provided protective controls from downstream platforms or frameworks, but these should not be treated as substitutes for patching. Applications that do not use a server, or do not use a framework, bundler, or plugin that supports React Server Components, are not affected.

Remediation

Patch, then assume compromise.

Upgrade the affected React Server Components packages to fixed versions: react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack should be updated from 19.0.2 to 19.0.3, from 19.1.3 to 19.1.4, or from 19.2.2 to 19.2.3, as appropriate. Downstream frameworks that bundle or depend on these packages, such as Next.js, should also be upgraded to vendor-provided patched releases.

PUBLIC EXPLOITS

Exploits

No valid public exploits. Mallory filtered out 5 candidates as fakes, detection scripts, or README-only repos.

VALID 0 / 5 TOTALView more in app

All candidate exploits were filtered out by Mallory's validation.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

Meta PlatformsReactapplication

Meta PlatformsReact-Server-Dom-Parcelapplication

Meta PlatformsReact-Server-Dom-Turbopackapplication

Meta PlatformsReact-Server-Dom-Webpackapplication

VercelNext.Jsapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

48 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

48 SOURCESView more in app

zeropath blogNews

Apr 8, 2026

Brief Summary: React Server Components DoS via Crafted Deserialization in CVE-2026-23869 - ZeroPath Blog | ZeroPath

A previously disclosed denial-of-service vulnerability in React Server Components.

f5 communityNews

Dec 30, 2025

F5 Threat Report - December 31st, 2025 | DevCentral

Listed in the aggregated IOC CVE list without additional detail in the provided content.

cyber security newsNews

Dec 19, 2025

OpenAI GPT-5.2-Codex Supercharges Agentic Coding and Cyber Vulnerability Detection

A denial-of-service (DoS) vulnerability in React Server Components, with a CVSS score of 7.5, disclosed December 11, 2024.

indusface blogNews

Dec 17, 2025

React After React2Shell: New RSC Vulnerabilities Expose DoS and Source Code Risks

A follow-up denial-of-service vulnerability in React Server Components, discovered after incomplete remediation of CVE-2025-55184, allowing attackers to trigger server lockup under certain configurations.

+16 more in the timeline

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity28

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2025-67779

NVD

nvd.nist.gov/vuln/detail/CVE-2025-67779

MITRE CWE · CWE-502

Deserialization of Untrusted Data

Vendor Advisory

react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components

Vendor Advisory

facebook.com/security/advisories/cve-2025-67779