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Vulnerability details: VCID-gsam-akzk-ukas
Vulnerability ID VCID-gsam-akzk-ukas
Aliases CVE-2025-30218
GHSA-223j-4rm8-mrmf
Summary Next.js is a React framework for building full-stack web applications. To mitigate CVE-2025-29927, Next.js validated the x-middleware-subrequest-id which persisted across multiple incoming requests. However, this subrequest ID is sent to all requests, even if the destination is not the same host as the Next.js application. Initiating a fetch request to a third-party within Middleware will send the x-middleware-subrequest-id to that third party. This vulnerability is fixed in 12.3.6, 13.5.10, 14.2.26, and 15.2.4.
Status Published
Exploitability 0.5
Weighted Severity 3.3
Risk 1.6
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 3.7 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-30218.json
epss 0.00234 https://api.first.org/data/v1/epss?cve=CVE-2025-30218
epss 0.00234 https://api.first.org/data/v1/epss?cve=CVE-2025-30218
epss 0.00234 https://api.first.org/data/v1/epss?cve=CVE-2025-30218
epss 0.00234 https://api.first.org/data/v1/epss?cve=CVE-2025-30218
cvssv3.1_qr LOW https://github.com/advisories/GHSA-223j-4rm8-mrmf
cvssv4 1.7 https://github.com/vercel/next.js
generic_textual LOW https://github.com/vercel/next.js
cvssv3.1_qr LOW https://github.com/vercel/next.js/security/advisories/GHSA-223j-4rm8-mrmf
cvssv4 1.7 https://github.com/vercel/next.js/security/advisories/GHSA-223j-4rm8-mrmf
generic_textual LOW https://github.com/vercel/next.js/security/advisories/GHSA-223j-4rm8-mrmf
ssvc Track https://github.com/vercel/next.js/security/advisories/GHSA-223j-4rm8-mrmf
cvssv4 1.7 https://nvd.nist.gov/vuln/detail/CVE-2025-30218
generic_textual LOW https://nvd.nist.gov/vuln/detail/CVE-2025-30218
cvssv4 1.7 https://vercel.com/changelog/cve-2025-30218-5DREmEH765PoeAsrNNQj3O
generic_textual LOW https://vercel.com/changelog/cve-2025-30218-5DREmEH765PoeAsrNNQj3O
ssvc Track https://vercel.com/changelog/cve-2025-30218-5DREmEH765PoeAsrNNQj3O
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-30218.json
https://api.first.org/data/v1/epss?cve=CVE-2025-30218
https://github.com/vercel/next.js
https://nvd.nist.gov/vuln/detail/CVE-2025-30218
2357034 https://bugzilla.redhat.com/show_bug.cgi?id=2357034
cve-2025-30218-5DREmEH765PoeAsrNNQj3O https://vercel.com/changelog/cve-2025-30218-5DREmEH765PoeAsrNNQj3O
GHSA-223j-4rm8-mrmf https://github.com/advisories/GHSA-223j-4rm8-mrmf
GHSA-223j-4rm8-mrmf https://github.com/vercel/next.js/security/advisories/GHSA-223j-4rm8-mrmf
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-30218.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U Found at https://github.com/vercel/next.js
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U Found at https://github.com/vercel/next.js/security/advisories/GHSA-223j-4rm8-mrmf
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-03T13:43:59Z/ Found at https://github.com/vercel/next.js/security/advisories/GHSA-223j-4rm8-mrmf
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U Found at https://nvd.nist.gov/vuln/detail/CVE-2025-30218
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U Found at https://vercel.com/changelog/cve-2025-30218-5DREmEH765PoeAsrNNQj3O
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-03T13:43:59Z/ Found at https://vercel.com/changelog/cve-2025-30218-5DREmEH765PoeAsrNNQj3O
Exploit Prediction Scoring System (EPSS)
Percentile 0.46506
EPSS Score 0.00234
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:57:12.503958+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2025/30xxx/CVE-2025-30218.json 38.6.0