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Fencer Vulns
medium 5.3

CVE-2025-55183 json

Source Code Exposure Vulnerability in React Server Components

published 2025-12-11 10 mo ago modified 2026-10-07 32 d ago also EUVD-2025-202879 , GHSA-925w-6v3x-g4j4 , GHSA-w37m-7fhw-fmv9

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
64.2%
EPSS 64.2% chance of exploitation in 30 days, percentile 99.2%
public exploits
0
none known

Summary

An information leak vulnerability exists in specific configurations of React Server Components versions 19.0.0, 19.0.1 19.1.0, 19.1.1, 19.1.2, 19.2.0 and 19.2.1, including the following packages: react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack. A specifically crafted HTTP request sent to a vulnerable Server Function may unsafely return the source code of any Server Function. Exploitation requires the existence of a Server Function which explicitly or implicitly exposes a stringified argument.

Patch / fix

  • npm react-server-dom-parcel 19.0.2, 19.1.3, 19.2.2
  • npm react-server-dom-turbopack 19.0.2, 19.1.3, 19.2.2
  • npm react-server-dom-webpack 19.0.2, 19.1.3, 19.2.2
  • npm next 15.0.6, 15.1.10, 15.2.7, 15.3.7, 15.4.9, 15.5.8, 15.6.0-canary.59, 16.0.9, 16.1.0-canary.17
  • vercel next.js 15.0.7, 15.1.11, 15.2.8, 15.3.8, 15.4.10, 15.5.9, 16.0.10
  • facebook react 19.0.2, 19.1.3, 19.2.2

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-55183 updated cvss 5.3

next: React Server Components: Source code exposure through crafted HTTP request

  • Red Hat Enterprise Linux 7 firefox Red Hat Enterprise Linux 8 firefox, thunderbird Red Hat Enterprise Linux 9 firefox, dotnet7.0, dotnet-host, firefox-x11, thunderbird, dotnet-sdk-7.0, +9 more Red Hat Enterprise Linux 10 firefox, thunderbird Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/disk-image-cuda-rhel9 Red Hat Trusted Artifact Signer rhtas/rekor-search-ui-rhel9
    +2 more products
    Red Hat streams for Apache Kafka 2 com.github.streamshub-console Red Hat streams for Apache Kafka 3 com.github.streamshub-console
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
10 mo ago

Exploit prediction

64.23% chance of exploitation in the next 30 days, higher than 99.2% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • react.dev https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
npm react-server-dom-parcel
>=19.0.0, <19.0.2
>=19.1.0, <19.1.3
>=19.2.0, <19.2.2
19.0.2
19.1.3
19.2.2
npm react-server-dom-turbopack
>=19.0.0, <19.0.2
>=19.1.0, <19.1.3
>=19.2.0, <19.2.2
19.0.2
19.1.3
19.2.2
npm react-server-dom-webpack
>=19.0.0, <19.0.2
>=19.1.0, <19.1.3
>=19.2.0, <19.2.2
19.0.2
19.1.3
19.2.2
npm next
>=15.0.0-canary.0, <15.0.6
>=15.1.1-canary.0, <15.1.10
>=15.2.0-canary.0, <15.2.7
>=15.3.0-canary.0, <15.3.7
>=15.4.0-canary.0, <15.4.9
>=15.5.1-canary.0, <15.5.8
>=15.6.0-canary.0, <15.6.0-canary.59
>=16.0.0-beta.0, <16.0.9
>=16.1.0-canary.0, <16.1.0-canary.17
15.0.6
15.1.10
15.2.7
15.3.7
15.4.9
15.5.8
15.6.0-canary.59
16.0.9
16.1.0-canary.17

Affected products

  • Meta react-server-dom-webpack
  • Meta react-server-dom-turbopack
  • Meta react-server-dom-parcel

Classification

Weakness
  • CWE-497 Exposure of Sensitive System Information to an Unauthorized Control Sphere
  • CWE-502 Deserialization of Untrusted Data
  • CWE-1395 Dependency on Vulnerable Third-Party Component
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of react/react published their own advisory on GitHub. Reviewed sources take precedence over it.