synced 13 MIN AGO
01 Record

CVE-2026-53666

React Router: Arbitrary Constructor Injection via deserializeErrors() in React Router SSR Hydration

MediumPUBLISHEDCNA: GitHub_M
CNA base score6.1 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
View raw JSON

02 Description

React Router: Arbitrary Constructor Injection via deserializeErrors() in React Router SSR Hydration

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.42% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 36.0% of scored records. A rank, not a probability.
NVD base score
6.1 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD analysis status
Analyzed. NVD last modified this record on 2026-10-24.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-07-27 21:14Z3 MO AGO
Last updated
2026-07-28 15:19Z3 MO AGO
Reserved
2026-06-09
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
Medium (CVSS 6.1)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weaknesses
  • CWE-470Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')Base
  • CWE-502Deserialization of Untrusted DataBase
Data version
5.2
Document digest
ef52faeac90ac6c57126b639a3480611e2487fb1187248d2827a997e0543cc86

05 Affected products

VendorProductVersionsPlatforms
remix-runreact-router>= 6.4.0, < 7.18.0—

06 References