How severe is CVE-2026-23870?

CVE-2026-23870 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-23870 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-23870?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-23870 have an EU (EUVD) identifier?

Yes. CVE-2026-23870 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27867.

When was CVE-2026-23870 published?

CVE-2026-23870 was published on 2026-05-06 and last updated on 2026-06-17.

CVE-2026-23870

CVE-2026-23870 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-27867
Published: 2026-05-06
Last modified: 2026-06-17

Description

A denial of service vulnerability could be triggered by sending specially crafted HTTP requests to server function endpoints, this could lead to server crashes, out-of-memory exceptions or excessive CPU usage; affecting the following packages: react-server-dom-webpack, react-server-dom-parcel, react-server-dom-turbopack (versions 19.0.0 through 19.0.5, 19.1.0 through 19.1.6, and 19.2.0 through 19.2.5).

Frequently asked questions

What is CVE-2026-23870?: A denial of service vulnerability could be triggered by sending specially crafted HTTP requests to server function endpoints, this could lead to server crashes, out-of-memory exceptions or excessive CPU usage; affecting the following packages: react-server-dom-webpack, react-server-dom-parcel, react-server-dom-turbopack (versions 19.0.0 through 19.0.5, 19.1.0 through 19.1.6, and 19.2.0 through 19.2.5).
How severe is CVE-2026-23870?: CVE-2026-23870 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-23870 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-23870?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-23870 have an EU (EUVD) identifier?: Yes. CVE-2026-23870 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27867.
When was CVE-2026-23870 published?: CVE-2026-23870 was published on 2026-05-06 and last updated on 2026-06-17.

References

https://github.com/facebook/react/security/advisories/GHSA-rv78-f8rc-xrxh