CVE-2025-55183Network attack vector

Source-code disclosure via Server Function stringification

Published Dec 11, 2025 · Updated Dec 11, 2025

Source-code exposure in React Server Components allows remote attackers to read Server Function code through crafted HTTP requests. The server response stringifies an attacker-controlled argument with a referenced Server Function, causing bundled function source to be serialized into returned data. Exploitation requires a Server Function that explicitly or implicitly stringifies the argument; exposure is limited to inlined function code and hardcoded secrets, not runtime environment secrets.

CVSS severity5.3
Medium
EPSS probability64.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Source-code exposure in React Server Components allows remote attackers to read Server Function code through crafted HTTP requests. The server response stringifies an attacker-controlled argument with a referenced Server Function, causing bundled function source to be serialized into returned data. Exploitation requires a Server Function that explicitly or implicitly stringifies the argument; exposure is limited to inlined function code and hardcoded secrets, not runtime environment secrets.

The record

CVE
CVE-2025-55183
Published
Dec 11, 2025
Updated
Dec 11, 2025
Vendor
Meta Platforms, Inc.
Product
react-server-dom-parcel
Classifications
CWE-497, CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 11, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=19.0.0 <=19.0.1
  2. Affected versionversion=19.1.0 <=19.1.2
  3. Affected versionversion=19.2.0 <=19.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Meta Platforms, Inc. · react-server-dom-parcelversion=19.0.0 <=19.0.1; version=19.1.0 <=19.1.2; version=19.2.0 <=19.2.1
Meta Platforms, Inc. · react-server-dom-turbopackversion=19.0.0 <=19.0.1; version=19.1.0 <=19.1.2; version=19.2.0 <=19.2.1
Meta Platforms, Inc. · react-server-dom-webpackversion=19.0.0 <=19.0.1; version=19.1.0 <=19.1.2; version=19.2.0 <=19.2.1

Published CVSS scores

5.3ReactCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-497Exposure of Sensitive System Information to an Unauthorized Control Sphere
CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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