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CVE-2026-19879 Io.undertow/undertow: undertow: http response header integrity issue due to character truncation

🗓️ 14 Aug 2026 14:51:36Reported by redhatType 
cvelist
 cvelist🔗 www.cve.org👁 18 Views

Undertow writeString() truncates Unicode chars to 8-bit bytes in response headers, causing integrity issues.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
attackerkb
ATTACKERKB		CVE-2026-19879
14 Aug 202614:51
–attackerkb
cve
CVE		CVE-2026-19879
14 Aug 202614:51
–cve
euvd
EUVD		EUVD-2026-58670
14 Aug 202614:51
–euvd
nvd
NVD		CVE-2026-19879
14 Aug 202615:17
–nvd
ptsecurity
Positive Technologies		PT-2026-72036
14 Aug 202600:00
–ptsecurity
redhatcve
RedhatCVE		CVE-2026-19879
14 Aug 202614:51
–redhatcve
vulnrichment
Vulnrichment		CVE-2026-19879 Io.undertow/undertow: undertow: http response header integrity issue due to character truncation
14 Aug 202614:51
–vulnrichment
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14 Aug 2026 14:51Current
CVSS 3.15.3
CWE-681
Undertowheader truncationUnicode castresponse headerinformation disclosure
18