CVE-2026-28369
This behavior, which violates HTTP standards, can be exploited by a remote attacker to perform request smuggling.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.68%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A flaw was found in Undertow. When Undertow receives an HTTP request where the first header line starts with one or more spaces, it incorrectly processes the request by stripping these leading spaces. This behavior, which violates HTTP standards, can be exploited by a remote attacker to perform request smuggling. Request smuggling allows an attacker to bypass security mechanisms, access restricted information, or manipulate web caches, potentially leading to unauthorized actions or data exposure.
- CVSS 3.1
- 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- EPSS
- 0.68% probability · 50th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-444
- Affected
- redhat/build of apache camel - hawtio · redhat/build of apache camel for spring boot · redhat/data grid · redhat/fuse · redhat/jboss enterprise application platform · redhat/jboss enterprise application platform expansion pack · redhat/process automation · redhat/single sign-on · redhat/undertow · redhat/enterprise linux
- Source
- secalert@redhat.com
References
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.