ghsa-3gv6-g396-9v4r
CVSS 8.7 osv_maven
Description
A flaw was found in Undertow. A remote attacker can exploit this vulnerability by sending `\r\r\r` as a header block terminator. This can be used for request smuggling with certain proxy servers, such as older versions of Apache Traffic Server and Google Cloud Classic Application Load Balancer, potentially leading to unauthorized access or manipulation of web requests.
Timeline
- Published
- unknown
- Last Modified
- unknown
CVSS Details
CVSS details not available.
Affected Products
No product information available.
Weaknesses (CWE)
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-28367
- https://github.com/undertow-io/undertow/commit/3ece0bf2b2cf5e01db8ca25e41b831e66d3f5961
- https://github.com/undertow-io/undertow/commit/904e26f1be62fb00b440538608a9574839821878
- https://github.com/undertow-io/undertow/commit/c5dc41479e9c3576552d7e98e31bb1c237ae155e
- https://access.redhat.com/errata/RHSA-2026:25125
- https://access.redhat.com/errata/RHSA-2026:25126
- https://access.redhat.com/security/cve/CVE-2026-28367
- https://bugzilla.redhat.com/show_bug.cgi?id=2443260
- https://github.com/undertow-io/undertow
Linked Vulnerabilities
No linked vulnerabilities found.
{
"affected": [
{
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},
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"name": "io.undertow:undertow-core",
"purl": "pkg:maven/io.undertow/undertow-core"
},
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{
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{
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},
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},
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}
],
"aliases": [
"CVE-2026-28367"
],
"database_specific": {
"cwe_ids": [
"CWE-444"
],
"github_reviewed": true,
"github_reviewed_at": "2026-03-31T23:13:55Z",
"nvd_published_at": "2026-03-27T17:16:27Z",
"severity": "HIGH"
},
"details": "A flaw was found in Undertow. A remote attacker can exploit this vulnerability by sending `\\r\\r\\r` as a header block terminator. This can be used for request smuggling with certain proxy servers, such as older versions of Apache Traffic Server and Google Cloud Classic Application Load Balancer, potentially leading to unauthorized access or manipulation of web requests.",
"id": "GHSA-3gv6-g396-9v4r",
"modified": "2026-11-04T21:30:07.194498764Z",
"published": "2026-03-27T18:31:27Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28367"
},
{
"type": "WEB",
"url": "https://github.com/undertow-io/undertow/commit/3ece0bf2b2cf5e01db8ca25e41b831e66d3f5961"
},
{
"type": "WEB",
"url": "https://github.com/undertow-io/undertow/commit/904e26f1be62fb00b440538608a9574839821878"
},
{
"type": "WEB",
"url": "https://github.com/undertow-io/undertow/commit/c5dc41479e9c3576552d7e98e31bb1c237ae155e"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:25125"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:25126"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2026-28367"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2443260"
},
{
"type": "PACKAGE",
"url": "https://github.com/undertow-io/undertow"
}
],
"schema_version": "1.9.2",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N",
"type": "CVSS_V3"
}
],
"summary": "Undertow is Vulnerable to HTTP Request/Response Smuggling"
}