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CVE-2026-19879

🗓️ 14 Aug 2026 14:51:36Reported by redhatType 
cve
 cve🔗 web.nvd.nist.gov👁 79 Views

Undertow writeString() silently narrows Unicode to bytes in HTTP response headers, enabling truncation and information disclosure.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
ibm
IBM Security Bulletins		Security Bulletin: IBM Terracotta is affected by undertow vulnerabilities that could allow unauthenticated attackers to bypass client certificate authentication via forged AJP attributes and trigger a Denial of Service (DoS)
10 Sep 202616:40
–ibm
attackerkb
attackerkb		CVE-2026-19879
14 Aug 202614:51
–attackerkb
cvelist
Cvelist		CVE-2026-19879 Io.undertow/undertow: undertow: http response header integrity issue due to character truncation
14 Aug 202614:51
–cvelist
debiancve
Debian CVE		CVE-2026-19879
14 Aug 202614:51
–debiancve
euvd
EUVD		EUVD-2026-58670
14 Aug 202614:51
–euvd
nvd
NVD		CVE-2026-19879
14 Aug 202615:17
–nvd
osv
OSV		DEBIAN-CVE-2026-19879
14 Aug 202615:17
–osv
osv
OSV		UBUNTU-CVE-2026-19879
14 Aug 202615:17
–osv
ptsecurity
Positive Technologies		PT-2026-72036
14 Aug 202600:00
–ptsecurity
rapid7
Rapid7 Vulnerability Database (full)		CVE-2026-19879: Incorrect Conversion between Numeric Types
14 Aug 202600:00
–rapid7
Rows per page
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14 Aug 2026 19:07Current
5.6Medium risk
Vulners AI Score5.6
CVSS 3.15.3
EPSS0.00393
SSVC
CWE-681
UndertowHTTP serverresponse headernarrowing castcharacter truncationinformation disclosure
79