BREW-VITE-CVE-2026-39365 (GHSA-4W7W-66W2-5VF9)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:48 – Updated: 2026-09-17 19:24 – Source website
VLAI
Summary
Vite Vulnerable to Path Traversal in Optimized Deps `.map` Handling
Details
Summary
Any files ending with .map even out side the project can be returned to the browser.
Impact
Only apps that match the following conditions are affected:
- explicitly exposes the Vite dev server to the network (using
--hostorserver.hostconfig option) - have a sensitive content in files ending with
.mapand the path is predictable
Details
In Vite v7.3.1, the dev server’s handling of .map requests for optimized dependencies resolves file paths and calls readFile without restricting ../ segments in the URL. As a result, it is possible to bypass the server.fs.strict allow list and retrieve .map files located outside the project root, provided they can be parsed as valid source map JSON.
PoC
- Create a minimal PoC sourcemap outside the project root
bash cat > /tmp/poc.map <<'EOF' {"version":3,"file":"x.js","sources":[],"names":[],"mappings":""} EOF - Start the Vite dev server (example)
bash pnpm -C playground/fs-serve dev --host 127.0.0.1 --port 18080 - Confirm that direct
/@fsaccess is blocked bystrict(returns 403) - Inject
../segments under the optimized deps.mapURL prefix to reach/tmp/poc.map
Severity
References
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"upstream_fixed_in": "8.0.5"
},
"package": {
"ecosystem": "Homebrew",
"name": "vite",
"purl": "pkg:brew/vite"
},
"ranges": [
{
"events": [
{
"introduced": "2.5.1"
},
{
"fixed": "8.0.5"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "npm",
"key": "pkg:npm/vite@8.3.0",
"name": "vite",
"strategy": "registry",
"subject_version": "8.3.0"
}
]
},
"details": "### Summary\n\nAny files ending with `.map` even out side the project can be returned to the browser.\n\n### Impact\n\nOnly apps that match the following conditions are affected:\n\n- explicitly exposes the Vite dev server to the network (using `--host` or [`server.host` config option](https://vitejs.dev/config/server-options.html#server-host))\n- have a sensitive content in files ending with `.map` and the path is predictable\n\n### Details\n\nIn Vite v7.3.1, the dev server\u2019s handling of `.map` requests for optimized dependencies resolves file paths and calls `readFile` without restricting `../` segments in the URL. As a result, it is possible to bypass the [`server.fs.strict`](https://vite.dev/config/server-options#server-fs-strict) allow list and retrieve `.map` files located outside the project root, provided they can be parsed as valid source map JSON.\n\n### PoC\n1. Create a minimal PoC sourcemap outside the project root\n ```bash\n cat \u003e /tmp/poc.map \u003c\u003c\u0027EOF\u0027\n {\"version\":3,\"file\":\"x.js\",\"sources\":[],\"names\":[],\"mappings\":\"\"}\n EOF\n ```\n2. Start the Vite dev server (example)\n ```bash\n pnpm -C playground/fs-serve dev --host 127.0.0.1 --port 18080\n ```\n3. Confirm that direct `/@fs` access is blocked by `strict` (returns 403)\n \u003cimg width=\"4004\" height=\"1038\" alt=\"image\" src=\"https://github.com/user-attachments/assets/15a859a8-1dc6-4105-8d58-80527c0dd9ab\" /\u003e\n4. Inject `../` segments under the optimized deps `.map` URL prefix to reach `/tmp/poc.map`\n \u003cimg width=\"2790\" height=\"846\" alt=\"image\" src=\"https://github.com/user-attachments/assets/5d02957d-2e6a-4c45-9819-3f024e0e81f2\" /\u003e",
"id": "BREW-vite-CVE-2026-39365",
"modified": "2026-09-17T19:24:34Z",
"published": "2026-08-13T17:48:54Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/security/advisories/GHSA-4w7w-66w2-5vf9"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39365"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/pull/22161"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/commit/79f002f2286c03c88c7b74c511c7f9fc6dc46694"
},
{
"type": "PACKAGE",
"url": "https://github.com/vitejs/vite"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/releases/tag/v6.4.2"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/releases/tag/v7.3.2"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/releases/tag/v8.0.5"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Vite Vulnerable to Path Traversal in Optimized Deps `.map` Handling",
"upstream": [
"GHSA-4w7w-66w2-5vf9",
"CVE-2026-39365"
]
}
CVE-2026-39365 (GCVE-0-2026-39365)
Vulnerability from cvelistv5 – Published: 2026-04-07 19:13 – Updated: 2026-04-15 14:23
VLAI
EPSS
VEX
Title
Vite has a Path Traversal in Optimized Deps `.map` Handling
Summary
Vite is a frontend tooling framework for JavaScript. From 6.0.0 to before 6.4.2, 7.3.2, and 8.0.5, the dev server’s handling of .map requests for optimized dependencies resolves file paths and calls readFile without restricting ../ segments in the URL. As a result, it is possible to bypass the server.fs.strict allow list and retrieve .map files located outside the project root, provided they can be parsed as valid source map JSON. This vulnerability is fixed in 6.4.2, 7.3.2, and 8.0.5.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-09 18:10 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/vitejs/vite/security/advisorie… | x_refsource_CONFIRM |
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-39365",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-09T18:10:42.839064Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-15T14:23:24.501Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "vite",
"vendor": "vitejs",
"versions": [
{
"status": "affected",
"version": "\u003e= 8.0.0, \u003c 8.0.5"
},
{
"status": "affected",
"version": "\u003e= 7.0.0, \u003c 7.3.2"
},
{
"status": "affected",
"version": "\u003e= 6.0.0, \u003c 6.4.2"
}
]
},
{
"product": "vite-plus",
"vendor": "vitejs",
"versions": [
{
"status": "affected",
"version": "\u003c 0.1.16"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Vite is a frontend tooling framework for JavaScript. From 6.0.0 to before 6.4.2, 7.3.2, and 8.0.5, the dev server\u2019s handling of .map requests for optimized dependencies resolves file paths and calls readFile without restricting ../ segments in the URL. As a result, it is possible to bypass the server.fs.strict allow list and retrieve .map files located outside the project root, provided they can be parsed as valid source map JSON. This vulnerability is fixed in 6.4.2, 7.3.2, and 8.0.5."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "NONE"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-22",
"description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-07T19:13:50.927Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/vitejs/vite/security/advisories/GHSA-4w7w-66w2-5vf9",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/vitejs/vite/security/advisories/GHSA-4w7w-66w2-5vf9"
}
],
"source": {
"advisory": "GHSA-4w7w-66w2-5vf9",
"discovery": "UNKNOWN"
},
"title": "Vite has a Path Traversal in Optimized Deps `.map` Handling"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-39365",
"datePublished": "2026-04-07T19:13:50.927Z",
"dateReserved": "2026-04-06T21:29:17.349Z",
"dateUpdated": "2026-04-15T14:23:24.501Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
GHSA-4W7W-66W2-5VF9
Vulnerability from github – Published: 2026-04-06 18:03 – Updated: 2026-04-07 22:16
VLAI
Summary
Vite Vulnerable to Path Traversal in Optimized Deps `.map` Handling
Details
Summary
Any files ending with .map even out side the project can be returned to the browser.
Impact
Only apps that match the following conditions are affected:
- explicitly exposes the Vite dev server to the network (using
--hostorserver.hostconfig option) - have a sensitive content in files ending with
.mapand the path is predictable
Details
In Vite v7.3.1, the dev server’s handling of .map requests for optimized dependencies resolves file paths and calls readFile without restricting ../ segments in the URL. As a result, it is possible to bypass the server.fs.strict allow list and retrieve .map files located outside the project root, provided they can be parsed as valid source map JSON.
PoC
- Create a minimal PoC sourcemap outside the project root
bash cat > /tmp/poc.map <<'EOF' {"version":3,"file":"x.js","sources":[],"names":[],"mappings":""} EOF - Start the Vite dev server (example)
bash pnpm -C playground/fs-serve dev --host 127.0.0.1 --port 18080 - Confirm that direct
/@fsaccess is blocked bystrict(returns 403) - Inject
../segments under the optimized deps.mapURL prefix to reach/tmp/poc.map
Severity
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 8.0.4"
},
"package": {
"ecosystem": "npm",
"name": "vite"
},
"ranges": [
{
"events": [
{
"introduced": "8.0.0"
},
{
"fixed": "8.0.5"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 7.3.1"
},
"package": {
"ecosystem": "npm",
"name": "vite"
},
"ranges": [
{
"events": [
{
"introduced": "7.0.0"
},
{
"fixed": "7.3.2"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 6.4.1"
},
"package": {
"ecosystem": "npm",
"name": "vite"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "6.4.2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-39365"
],
"database_specific": {
"cwe_ids": [
"CWE-200",
"CWE-22"
],
"github_reviewed": true,
"github_reviewed_at": "2026-04-06T18:03:46Z",
"nvd_published_at": "2026-04-07T20:16:30Z",
"severity": "MODERATE"
},
"details": "### Summary\n\nAny files ending with `.map` even out side the project can be returned to the browser.\n\n### Impact\n\nOnly apps that match the following conditions are affected:\n\n- explicitly exposes the Vite dev server to the network (using `--host` or [`server.host` config option](https://vitejs.dev/config/server-options.html#server-host))\n- have a sensitive content in files ending with `.map` and the path is predictable\n\n### Details\n\nIn Vite v7.3.1, the dev server\u2019s handling of `.map` requests for optimized dependencies resolves file paths and calls `readFile` without restricting `../` segments in the URL. As a result, it is possible to bypass the [`server.fs.strict`](https://vite.dev/config/server-options#server-fs-strict) allow list and retrieve `.map` files located outside the project root, provided they can be parsed as valid source map JSON.\n\n### PoC\n1. Create a minimal PoC sourcemap outside the project root\n ```bash\n cat \u003e /tmp/poc.map \u003c\u003c\u0027EOF\u0027\n {\"version\":3,\"file\":\"x.js\",\"sources\":[],\"names\":[],\"mappings\":\"\"}\n EOF\n ```\n2. Start the Vite dev server (example)\n ```bash\n pnpm -C playground/fs-serve dev --host 127.0.0.1 --port 18080\n ```\n3. Confirm that direct `/@fs` access is blocked by `strict` (returns 403)\n \u003cimg width=\"4004\" height=\"1038\" alt=\"image\" src=\"https://github.com/user-attachments/assets/15a859a8-1dc6-4105-8d58-80527c0dd9ab\" /\u003e\n4. Inject `../` segments under the optimized deps `.map` URL prefix to reach `/tmp/poc.map`\n \u003cimg width=\"2790\" height=\"846\" alt=\"image\" src=\"https://github.com/user-attachments/assets/5d02957d-2e6a-4c45-9819-3f024e0e81f2\" /\u003e",
"id": "GHSA-4w7w-66w2-5vf9",
"modified": "2026-04-07T22:16:27Z",
"published": "2026-04-06T18:03:46Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/security/advisories/GHSA-4w7w-66w2-5vf9"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39365"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/pull/22161"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/commit/79f002f2286c03c88c7b74c511c7f9fc6dc46694"
},
{
"type": "PACKAGE",
"url": "https://github.com/vitejs/vite"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/releases/tag/v6.4.2"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/releases/tag/v7.3.2"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/releases/tag/v8.0.5"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Vite Vulnerable to Path Traversal in Optimized Deps `.map` Handling"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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