High severity8.7NVD Advisory· Published Mar 27, 2026· Updated Jun 10, 2026
CVE-2026-28367
CVE-2026-28367
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
io.undertow:undertow-parentMaven | <= 2.3.23.Final | — |
Affected products
11- cpe:2.3:a:redhat:build_of_apache_camel_for_spring_boot:4.0:*:*:*:*:*:*:*
- cpe:2.3:a:redhat:build_of_apache_camel_-_hawtio:4.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.0.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:redhat:jboss_enterprise_application_platform:8.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-:*:*:*:*:*:*:*
- cpe:2.3:a:redhat:process_automation:7.0:*:*:*:*:*:*:*
- cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
6- access.redhat.com/security/cve/CVE-2026-28367nvdVendor AdvisoryWEB
- bugzilla.redhat.com/show_bug.cginvdIssue TrackingVendor AdvisoryWEB
- github.com/advisories/GHSA-3gv6-g396-9v4rghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-28367ghsaADVISORY
- access.redhat.com/errata/RHSA-2026:25125nvdWEB
- access.redhat.com/errata/RHSA-2026:25126nvdWEB
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