Home
» GitHub Advisories
» GHSA-4342-x723-ch2f
Description
A vulnerability in Next.js Middleware has been fixed in v14.2.32 and v15.4.7 . The issue occurred when request headers were directly passed into NextResponse.next(). In self-hosted applications, this could allow Server-Side Request Forgery (SSRF) if certain sensitive headers from the incoming request were reflected back into the response.
All users implementing custom middleware logic in self-hosted environments are strongly encouraged to upgrade and verify correct usage of the next() function.
More details at Vercel Changelog
Basic information
Type
reviewed
Severity
medium Advisory on GitHub
Open advisory ↗ Repository advisory
Open repository advisory ↗ Source code
Browse source ↗ Published (advisory)
2025-08-29 21:33:09 UTC
Updated
2025-09-11 15:41:03 UTC
GitHub reviewed
2025-08-29 21:33:09 UTC
NVD published
2025-08-29
EPSS Score
Score
Percentile
5.63%
90.19%
CVSS Scores
Base score
Version
Severity
Vector
6.5
3.1
—
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
CWEs
CWE id
Name
CWE-918
Server-Side Request Forgery (SSRF)
Credits
medikoo
(analyst)
prdngr
(reporter)
Affected packages (2)
Vulnerable version ranges and first patched releases as published by GitHub.
Ecosystem
Package
Vulnerable range
First patched
Vulnerable functions
npm
next >= 15.0.0-canary.0, < 15.4.7
15.4.7
—
npm
next >= 0.9.9, < 14.2.32
14.2.32
—
cvelogic
Threat Intelligence