Full Report
Vercel security advisory (AV26-754)
Analysis Summary
# Vulnerability: Multiple Vulnerabilities in Vercel Next.js
## CVE Details
*Note: The source advisory AV26-754 refers to these updates as security-related, but specific CVE identifiers were not listed in the summary text. Based on standard Vercel disclosure practices, these usually involve Cross-Site Scripting (XSS), Cache Poisoning, or Server-Side Request Forgery (SSRF).*
- **CVE ID:** Pending/Not specified in advisory
- **CVSS Score:** N/A (Severity estimated based on product type)
- **CWE:** Not specified
## Affected Systems
- **Products:** Next.js (Vercel)
- **Versions:**
- Next.js v15 branches prior to v15.5.21
- Next.js v16 branches prior to v16.2.11
- **Configurations:** Applications utilizing Next.js framework for server-side rendering or static site generation.
## Vulnerability Description
While the advisory identifies these as security releases, the technical specifics of the flaws are contained within the GitHub release notes for versions 15.5.21 and 16.2.11. Historically, Next.js vulnerabilities in these branch types often involve:
1. **Middleware bypasses** where specific crafted URLs can circumvent security headers or authentication.
2. **Image Optimization flaws** that could lead to Denial of Service (DoS).
3. **Response Splitting** or Cache Poisoning via manipulated headers.
## Exploitation
- **Status:** Not reported as exploited in the wild (based on advisory content).
- **Complexity:** Medium (Typical for framework-level vulnerabilities).
- **Attack Vector:** Network (Remote).
## Impact
- **Confidentiality:** Potential (Depending on specific flaw)
- **Integrity:** Potential
- **Availability:** Potential
## Remediation
### Patches
Vercel has released official updates to address these vulnerabilities. Administrators should upgrade to:
- **Next.js v15.5.21**
- **Next.js v16.2.11**
Update via npm/yarn:
`npm install next@latest` or `yarn upgrade next@latest`
### Workarounds
- No specific workarounds are provided. Immediate patching is the recommended course of action for web-facing framework components.
## Detection
- **Indicators of Compromise:** Monitor server logs for unusual URL patterns or unexpected status codes (403/404) related to internal API routes or image optimization endpoints.
- **Detection Methods:** Vulnerability scanners (OWASP ZAP, Burp Suite) and Dependency Checkers (Snyk, npm audit) can identify out-of-date Next.js versions in the CI/CD pipeline.
## References
- [Vercel Advisory AV26-754] - hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/vercel-security-advisory-av26-754
- [Next.js Release v15.5.21] - hxxps[://]github[.]com/vercel/next[.]js/releases/tag/v15.5.21
- [Next.js Release v16.2.11] - hxxps[://]github[.]com/vercel/next[.]js/releases/tag/v16.2.11