Next Server Actions Source Code Exposure
Key facts
- Attack vector
- —
- Privileges required
- —
- User interaction
- —
- Attack complexity
- —
- Impact type
- Information disclosure, Code execution
- Confidentiality · integrity · availability
- —
- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub. Impact type from CWE-497 and CWE-502.
Summary
A vulnerability affects certain React packages for versions 19.0.0, 19.0.1, 19.1.0, 19.1.1, 19.1.2, 19.2.0, and 19.2.1 and frameworks that use the affected packages, including Next.js 15.x and 16.x using the App Router. The issue is tracked upstream as [CVE-2025-55183](https://www.cve.org/CVERecord?id=CVE-2025-55183). A malicious HTTP request can be crafted and sent to any App Router endpoint that can return the compiled source code of [Server Functions](https://react.dev/reference/rsc/server-functions). This could reveal business logic, but would not expose secrets unless they were hardcoded directly into [Server Function](https://react.dev/reference/rsc/server-functions) code.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | next (npm) | 15.0.0-canary.0 to before 15.0.6 | 15.0.6 | Patch available | GHSA-w37m-7fhw-fmv9 |
| — | next (npm) | 15.1.1-canary.0 to before 15.1.10 | 15.1.10 | Patch available | GHSA-w37m-7fhw-fmv9 |
| — | next (npm) | 15.2.0-canary.0 to before 15.2.7 | 15.2.7 | Patch available | GHSA-w37m-7fhw-fmv9 |
| — | next (npm) | 15.3.0-canary.0 to before 15.3.7 | 15.3.7 | Patch available | GHSA-w37m-7fhw-fmv9 |
| — | next (npm) | 15.4.0-canary.0 to before 15.4.9 | 15.4.9 | Patch available | GHSA-w37m-7fhw-fmv9 |
| — | next (npm) | 15.5.1-canary.0 to before 15.5.8 | 15.5.8 | Patch available | GHSA-w37m-7fhw-fmv9 |
| — | next (npm) | 15.6.0-canary.0 to before 15.6.0-canary.59 | 15.6.0-canary.59 | Patch available | GHSA-w37m-7fhw-fmv9 |
| — | next (npm) | 16.0.0-beta.0 to before 16.0.9 | 16.0.9 | Patch available | GHSA-w37m-7fhw-fmv9 |
| — | next (npm) | 16.1.0-canary.0 to before 16.1.0-canary.17 | 16.1.0-canary.17 | Patch available | GHSA-w37m-7fhw-fmv9 |
- next (npm) Vendor— Affected 15.0.0-canary.0 to before 15.0.6 Fixed in 15.0.6 Patch available GHSA-w37m-7fhw-fmv9
- next (npm) Vendor— Affected 15.1.1-canary.0 to before 15.1.10 Fixed in 15.1.10 Patch available GHSA-w37m-7fhw-fmv9
- next (npm) Vendor— Affected 15.2.0-canary.0 to before 15.2.7 Fixed in 15.2.7 Patch available GHSA-w37m-7fhw-fmv9
- next (npm) Vendor— Affected 15.3.0-canary.0 to before 15.3.7 Fixed in 15.3.7 Patch available GHSA-w37m-7fhw-fmv9
- next (npm) Vendor— Affected 15.4.0-canary.0 to before 15.4.9 Fixed in 15.4.9 Patch available GHSA-w37m-7fhw-fmv9
- next (npm) Vendor— Affected 15.5.1-canary.0 to before 15.5.8 Fixed in 15.5.8 Patch available GHSA-w37m-7fhw-fmv9
- next (npm) Vendor— Affected 15.6.0-canary.0 to before 15.6.0-canary.59 Fixed in 15.6.0-canary.59 Patch available GHSA-w37m-7fhw-fmv9
- next (npm) Vendor— Affected 16.0.0-beta.0 to before 16.0.9 Fixed in 16.0.9 Patch available GHSA-w37m-7fhw-fmv9
- next (npm) Vendor— Affected 16.1.0-canary.0 to before 16.1.0-canary.17 Fixed in 16.1.0-canary.17 Patch available GHSA-w37m-7fhw-fmv9
Remediation
- Fix · GHSA-w37m-7fhw-fmv9 next (npm) Fixed in 15.0.6 Advisory →
- Fix · GHSA-w37m-7fhw-fmv9 next (npm) Fixed in 15.1.10 Advisory →
- Fix · GHSA-w37m-7fhw-fmv9 next (npm) Fixed in 15.2.7 Advisory →
- Fix · GHSA-w37m-7fhw-fmv9 next (npm) Fixed in 15.3.7 Advisory →
- Fix · GHSA-w37m-7fhw-fmv9 next (npm) Fixed in 15.4.9 Advisory →
- Fix · GHSA-w37m-7fhw-fmv9 next (npm) Fixed in 15.5.8 Advisory →
- Fix · GHSA-w37m-7fhw-fmv9 next (npm) Fixed in 15.6.0-canary.59 Advisory →
- Fix · GHSA-w37m-7fhw-fmv9 next (npm) Fixed in 16.0.9 Advisory →
- Fix · GHSA-w37m-7fhw-fmv9 next (npm) Fixed in 16.1.0-canary.17 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-w37m-7fhw-fmv9
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences