CVE-2025-57822Network attack vector

SSRF via misclassified middleware Location header

Published Aug 29, 2025 · Updated Sep 2, 2025

SSRF in Next.js Middleware before 14.2.32 and before 15.4.7 allows remote attackers to access internal services via crafted headers. The self-hosted router treats a Location header returned with a non-redirect status as a rewrite target, allowing forwarded user-controlled headers to steer an internal request. Exploitation requires custom middleware that passes incoming headers directly to NextResponse.next() without the request object; Vercel-hosted deployments are not exposed.

CVSS severity8.2
High
EPSS probability2.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Next.js Middleware before 14.2.32 and before 15.4.7 allows remote attackers to access internal services via crafted headers. The self-hosted router treats a Location header returned with a non-redirect status as a rewrite target, allowing forwarded user-controlled headers to steer an internal request. Exploitation requires custom middleware that passes incoming headers directly to NextResponse.next() without the request object; Vercel-hosted deployments are not exposed.

The record

CVE
CVE-2025-57822
Published
Aug 29, 2025
Updated
Sep 2, 2025
Vendor
Vercel
Product
Next.js
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 2, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 14.2.32
  2. Affected versionversion=< 15.4.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vercel · Next.jsversion=< 14.2.32; version=< 15.4.7

Published CVSS scores

8.2NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
6.5GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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