Medium
Netty: Cache Poisoning and Information Disclosure via CORS Vary Header Overwrite
Type: advisorySources: OSV
Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.handler.codec.http.cors.CorsHandler setVaryHeader replaces application Vary headers such as Authorization or Cookie with Origin, allowing a caching proxy or CDN to reuse authenticated responses across users and disclose sensitive information. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-59903
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 17:11 UTC · Revision 1
Source evidence
Netty: Cache Poisoning and Information Disclosure via CORS Vary Header Overwrite
core-osv · Original sourcePublished 17 Aug 2026, 17:56 UTC
Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.handler.codec.http.cors.CorsHandler setVaryHeader replaces application Vary headers such as Authorization or Cookie with Origin, allowing a caching proxy or CDN to reuse authenticated responses across users and disclose sensitive information. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.
osv:CVE-2026-59903
Complete source record
{
"id": "9b4c666bcf4fcc7e9b31a3ccb3b9bc1f99edae8b29738cef1a55453a75bcfe9c",
"url": "https://osv.dev/vulnerability/CVE-2026-59903",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Netty: Cache Poisoning and Information Disclosure via CORS Vary Header Overwrite",
"summary": "Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.handler.codec.http.cors.CorsHandler setVaryHeader replaces application Vary headers such as Authorization or Cookie with Origin, allowing a caching proxy or CDN to reuse authenticated responses across users and disclose sensitive information. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.",
"evidence": "osv:CVE-2026-59903",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-59903",
"aliases": [
"CVE-2026-59903",
"GHSA-8c42-7qj2-3j46"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/netty/netty",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "5471f0a6ffa4ab39db22c468c6c851af4ecae709"
},
{
"introduced": "09e64d259c99be8b5b2a471a78f11e65eb82598a"
},
{
"fixed": "e0789d32c72f46fd2e7c99b6fdbbf7e2f4409e44"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "4.1.137"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.2.0"
},
{
"fixed": "4.2.17"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "5471f0a6ffa4ab39db22c468c6c851af4ecae709"
}
],
"source": "REFERENCES_TAG",
"original_tag": "netty-4.1.137.Final"
},
{
"range": [
{
"fixed": "e0789d32c72f46fd2e7c99b6fdbbf7e2f4409e44"
}
],
"source": "REFERENCES_TAG",
"original_tag": "netty-4.2.17.Final"
}
]
}
}
],
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59903.json"
}
}
],
"modified": "2026-10-28T02:30:21.399535340Z",
"provider": "osv",
"references": [
"https://github.com/netty/netty/releases/tag/netty-4.1.137.Final",
"https://github.com/netty/netty/releases/tag/netty-4.2.17.Final",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59903.json",
"https://github.com/netty/netty/security/advisories/GHSA-8c42-7qj2-3j46",
"https://nvd.nist.gov/vuln/detail/CVE-2026-59903",
"https://github.com/netty/netty/pull/17213",
"https://github.com/netty/netty/pull/17217"
],
"provider_metadata": {
"cwe_ids": [
"CWE-524"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59903.json"
}
},
"related_cves": [
{
"value": "CVE-2026-59903",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 487570,
"published_at": "2026-08-17T17:56:28.726+00:00"
}