Axios: XSRF Token Cross-Origin Leakage via Prototype Pollution Gadget in `withXSRFToken` Boolean Coercion
Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, the Axios library's XSRF token protection logic uses JavaScript truthy/falsy semantics instead of strict boolean comparison for the withXSRFToken config property. When this property is set to any truthy non-boolean value (via prototype pollution or misconfiguration), the same-origin check (isURLSameOrigin) is short-circuited, causing XSRF tokens to be sent to all request targets including cross-origin servers controlled by an attacker. This vulnerability is fixed in 1.15.1 and 0.31.1.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-42042
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 12:09 UTC · Revision 1
Source evidence
Axios: XSRF Token Cross-Origin Leakage via Prototype Pollution Gadget in `withXSRFToken` Boolean Coercion
core-osv · Original sourcePublished 24 Apr 2026, 18:03 UTC
Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, the Axios library's XSRF token protection logic uses JavaScript truthy/falsy semantics instead of strict boolean comparison for the withXSRFToken config property. When this property is set to any truthy non-boolean value (via prototype pollution or misconfiguration), the same-origin check (isURLSameOrigin) is short-circuited, causing XSRF tokens to be sent to all request targets including cross-origin servers controlled by an attacker. This vulnerability is fixed in 1.15.1 and 0.31.1.
osv:CVE-2026-42042
Complete source record
{
"id": "36b58bac49f6bf0ee987ac825e563fdb0737a970c4fc3cf42c745b97e210043d",
"url": "https://osv.dev/vulnerability/CVE-2026-42042",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Axios: XSRF Token Cross-Origin Leakage via Prototype Pollution Gadget in `withXSRFToken` Boolean Coercion",
"summary": "Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, the Axios library's XSRF token protection logic uses JavaScript truthy/falsy semantics instead of strict boolean comparison for the withXSRFToken config property. When this property is set to any truthy non-boolean value (via prototype pollution or misconfiguration), the same-origin check (isURLSameOrigin) is short-circuited, causing XSRF tokens to be sent to all request targets including cross-origin servers controlled by an attacker. This vulnerability is fixed in 1.15.1 and 0.31.1.",
"evidence": "osv:CVE-2026-42042",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-42042",
"aliases": [
"CVE-2026-42042",
"GHSA-xx6v-rp6x-q39c"
],
"metrics": [
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"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"
}
],
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"source": "CPE_RANGE"
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42042.json"
}
}
],
"modified": "2026-10-28T02:30:50.738549132Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42042.json",
"https://github.com/axios/axios/security/advisories/GHSA-xx6v-rp6x-q39c",
"https://nvd.nist.gov/vuln/detail/CVE-2026-42042"
],
"provider_metadata": {
"cwe_ids": [
"CWE-183",
"CWE-201"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42042.json"
}
},
"related_cves": [
{
"value": "CVE-2026-42042",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 519243,
"published_at": "2026-04-24T18:03:29.924+00:00"
}