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CVE-2026-28369 Undertow: undertow: request smuggling via malformed http request headers

🗓️ 27 Mar 2026 16:13:05Reported by redhatType 
cvelist
 cvelist🔗 www.cve.org👁 24 Views

Undertow flaw where leading spaces in the first header line enable request smuggling.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB		CVE-2026-28369
27 Mar 202616:13
–attackerkb
Circl		CVE-2026-28369
27 Mar 202619:19
–circl
CNNVD		Undertow 环境问题漏洞
27 Mar 202600:00
–cnnvd
CVE		CVE-2026-28369
27 Mar 202616:13
–cve
Debian CVE		CVE-2026-28369
27 Mar 202616:13
–debiancve
EUVD		EUVD-2026-16698
27 Mar 202618:31
–euvd
Github Security Blog		Undertow is Vulnerable to HTTP Request/Response Smuggling
27 Mar 202618:31
–github
NVD		CVE-2026-28369
27 Mar 202617:16
–nvd
OSV		DEBIAN-CVE-2026-28369
27 Mar 202617:16
–osv
OSV		GHSA-VQQJ-9CMV-HX43 Undertow is Vulnerable to HTTP Request/Response Smuggling
27 Mar 202618:31
–osv
Rows per page
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10 Jun 2026 21:05Current
CVSS 3.18.7
EPSS0.00677
CWE-444
UndertowRequest smugglingMalformed headersLeading spacesHeader processing
24