react-server-dom-parcel: Deserialization of Untrusted Data
CVE-2025-67779 is a high-severity deserialization of untrusted data vulnerability in react-server-dom-parcel from Meta, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected react-server-dom-parcel versions: 19.0.2 and earlier; 19.1.3 and earlier; 19.2.2 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 15.5% chance of exploitation within 30 days, which is in the top 3.15% of all scored CVEs.
EPSS places it among the vulnerabilities most likely to be exploited soon.
What to do
- Update Next.js to 14.2.35 or 15.0.7 or 15.1.11 or 15.2.8, whichever matches your release line, or a later version.
- Read the advisory on react.dev for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Meta | react-server-dom-parcel | 19.0.2 and earlier; 19.1.3 and earlier; 19.2.2 and earlier | Not stated |
| Meta | react-server-dom-turbopack | 19.0.2 and earlier; 19.1.3 and earlier; 19.2.2 and earlier | Not stated |
| Meta | react-server-dom-webpack | 19.0.2 and earlier; 19.1.3 and earlier; 19.2.2 and earlier | Not stated |
| React | 19.0.2; 19.1.3; 19.2.2 | Not stated | |
| Vercel | Next.js | 13.3.0 up to, but not including, 14.2.35; 15.0.0 up to, but not including, 15.0.7; 15.1.0 up to, but not including, 15.1.11; 15.2.0 up to, but not including, 15.2.8; 15.3.0 up to, but not including, 15.3.8; 15.4.0 up to, but not including, 15.4.10; 15.5.0 up to, but not including, 15.5.9; 16.0.0 up to, but not including, 16.0.10; and 2 more ranges | 14.2.35, 15.0.7, 15.1.11, 15.2.8, 15.3.8, 15.4.10 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by CNA (fb.com).
Official description
It was found that the fix addressing CVE-2025-55184 in React Server Components was incomplete and does not prevent a denial of service attack in a specific case. React Server Components versions 19.0.2, 19.1.3 and 19.2.2 are affected, allowing unsafe deserialization of payloads from HTTP requests to Server Function endpoints. This can cause an infinite loop that hangs the server process and may prevent future HTTP requests from being served.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Deserialization of Untrusted Data
The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
How developers prevent this class of flaw
- If available, use the signing/sealing features of the programming language to assure that deserialized data has not been tainted. For example, a hash-based message authentication code (HMAC) could be used to ensure that data has not been modified.
- When deserializing data, populate a new object rather than just deserializing. The result is that the data flows through safe input validation and that the functions are safe.
- Explicitly define a final object() to prevent deserialization.
More Deserialization of Untrusted Data vulnerabilities (CWE-502)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Other vulnerabilities in react-server-dom-parcel
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 10.0 Critical severity
Recent Deserialization of Untrusted Data vulnerabilities
- 8.8 High severity
- 8.1 High severity
- 9.8 Critical severity
- 8.7 High severity
- 8.4 High severity
- 8.8 High severity
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