PT-2025-27835 · Vercel · Vercel Cli+1

Ztanner · Published 2025-07-03 · Updated 2026-04-01 · CVE-2025-49005

Positive Technologies (AI Summary)

CVSS v3.1

3.7

Low

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions: Next.js versions 15.3.0 through 15.3.2 Vercel CLI versions 41.4.1 through 42.1.0

Description: A cache poisoning issue was found in Next.js App Router and Vercel CLI, allowing page requests for HTML content to return a React Server Component (RSC) payload under certain conditions. When deployed to Vercel, this issue only impacts the browser cache and does not lead to CDN poisoning. However, when self-hosted and deployed externally, it could lead to cache poisoning if the CDN does not properly distinguish between RSC and HTML in the cache keys.

Recommendations: For Next.js versions 15.3.0 through 15.3.2, upgrade to Next.js 15.3.3. For Vercel CLI versions 41.4.1 through 42.1.0, upgrade to Vercel CLI 42.2.0 and redeploy.

Exploit

Fix

HTTP Request/Response Smuggling

Weakness Enumeration

CWE-444

Related Identifiers

BDU:2025-16415

CLEANSTART-2026-IL36032

CVE-2025-49005

GHSA-R2FC-CCR8-96C4

Affected Products

Next.Js

Vercel Cli

References · 47

• 🔥 https://github.com/vercel/next.js/issues/79346 · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/49xxx/CVE-2025-49005.json · Exploit
• https://github.com/vercel/next.js/commit/ec202eccf05820b60c6126d6411fe16766ecc066 · Patch
• https://github.com/vercel/next.js/security/advisories/GHSA-r2fc-ccr8-96c4 · Vendor Advisory
• https://vercel.com/changelog/cve-2025-49005 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-r2fc-ccr8-96c4 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-49005 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-49005 · Security Note
• https://osv.dev/vulnerability/CLEANSTART-2026-IL36032 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-30218 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-65945 · Security Note
• https://bdu.fstec.ru/vul/2025-16415 · Security Note
• https://github.com/vercel/next.js · Note
• https://github.com/vercel/next.js/releases/tag/v15.3.3 · Note
• https://github.com/vercel/next.js/pull/79939 · Note