nodejs — security advisory
Undici is an HTTP/1.1 client written from scratch for Node.js. Prior to version 5.26.2, Undici already cleared Authorization headers on cross-origin redirects, but did not clear `Cookie` headers. By design, `cookie` headers are forbidden request headers, disallowing them to be set in RequestInit.headers in browser environments. Since undici handles headers more liberally than the spec, there was a disconnect from the assumptions the spec made, and undici's implementation of fetch. As such this may lead to accidental leakage of cookie to a third-party site or a malicious attacker who can control the redirection target (ie. an open redirector) to leak the cookie to the third party site. This was patched in version 5.26.2. There are no known workarounds.
- Products
- nodejs
- Affected versions
- Not specified
- Fixed versions
- 18.18.2-r0
- CVEs
- CVE-2023-45143
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 15:01 UTC · Revision 1
Source evidence
Undici is an HTTP/1.1 client written from scratch for Node.js. Prior to version 5.26.2, Undici already cleared Authorization headers on cross-origin redirects, but did not clear `Cookie` headers. By design, `cookie` headers are forbidden request headers, disallowing them to be set in RequestInit.headers in browser environments. Since undici handles headers more liberally than the spec, there was a disconnect from the assumptions the spec made, and undici's implementation of fetch. As such this may lead to accidental leakage of cookie to a third-party site or a malicious attacker who can control the redirection target (ie. an open redirector) to leak the cookie to the third party site. This was patched in version 5.26.2. There are no known workarounds.
osv:ALPINE-CVE-2023-45143
nodejs
Fixed versions: 18.18.2-r0
nodejs
Fixed versions: 18.18.2-r0
nodejs
Fixed versions: 18.18.2-r0
nodejs
Fixed versions: 18.18.2-r0
nodejs
Fixed versions: 18.18.2-r0
nodejs
Fixed versions: 18.18.2-r0
nodejs
Fixed versions: 18.18.2-r0
nodejs
Fixed versions: 18.18.2-r0
Complete source record
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"url": "https://osv.dev/vulnerability/ALPINE-CVE-2023-45143",
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"summary": "Undici is an HTTP/1.1 client written from scratch for Node.js. Prior to version 5.26.2, Undici already cleared Authorization headers on cross-origin redirects, but did not clear `Cookie` headers. By design, `cookie` headers are forbidden request headers, disallowing them to be set in RequestInit.headers in browser environments. Since undici handles headers more liberally than the spec, there was a disconnect from the assumptions the spec made, and undici's implementation of fetch. As such this may lead to accidental leakage of cookie to a third-party site or a malicious attacker who can control the redirection target (ie. an open redirector) to leak the cookie to the third party site. This was patched in version 5.26.2. There are no known workarounds.",
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"aliases": [
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"modified": "2026-10-26T17:17:58.645254074Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2023-45143"
]
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"evidence": "/upstream"
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],
"security_relevant": true,
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},
"source_id": "core-osv",
"document_id": 454514,
"published_at": "2023-10-12T17:15:10.087+00:00"
}