CVE-2026-19879: Io.undertow/undertow: undertow: http response header integrity issue due to character truncation
Red Hat · Red Hat build of Apache Camel for Spring Boot 4
Affected: Red Hat build of Apache Camel for Spring Boot 4 · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 33% of scored CVEs
DescriptionCVE.org
A flaw was found in Undertow, an HTTP server, within its HTTP response header writing path. The `writeString()` method performs a silent narrowing cast from 16-bit Unicode characters to 8-bit bytes when writing HTTP response header values. A remote attacker can exploit this by supplying specific Unicode characters in user-controlled input that an application places into response headers. This can lead to the truncation of these characters into ASCII control characters or special symbols, potentially resulting in limited integrity impact or information disclosure if the application does not properly sanitize user input.
Affected products20
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Red Hat · Red Hat build of Apache Camel for Spring Boot 4Versions not stated
- Red Hat · Red Hat build of Apache Camel for Spring Boot 4Versions not stated
- Red Hat · Red Hat build of Apache Camel for Spring Boot 4Versions not stated
- Red Hat · Red Hat build of Apache Camel for Spring Boot 4Versions not stated
- Red Hat · Red Hat Enterprise Linux 10Versions not stated
- Red Hat · Red Hat Enterprise Linux 8Versions not stated
- Red Hat · Red Hat Enterprise Linux 8Versions not stated
- Red Hat · Red Hat Enterprise Linux 9Versions not stated
- Red Hat · Red Hat JBoss Enterprise Application Platform 7Versions not stated
- Red Hat · Red Hat JBoss Enterprise Application Platform 7Versions not stated
- Red Hat · Red Hat JBoss Enterprise Application Platform 7Versions not stated
- Red Hat · Red Hat JBoss Enterprise Application Platform 7Versions not stated
- Red Hat · Red Hat JBoss Enterprise Application Platform 7Versions not stated
- Red Hat · Red Hat JBoss Enterprise Application Platform 7Versions not stated
- Red Hat · Red Hat JBoss Enterprise Application Platform 7Versions not stated
- Red Hat · Red Hat JBoss Enterprise Application Platform 8Versions not stated
- Red Hat · Red Hat JBoss Enterprise Application Platform 8Versions not stated
- Red Hat · Red Hat JBoss Enterprise Application Platform 8Versions not stated
- Red Hat · Red Hat JBoss Enterprise Application Platform Expansion PackVersions not stated
- Red Hat · Red Hat JBoss Enterprise Application Platform Expansion PackVersions not stated
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Red Hat
- Published
- August 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-19879 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.