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CVE-2026-28369

CRITICALCVSS 9.1/10EPSS 0.68%

Last modified

CVE-2026-28369 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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. EPSS estimates a 0.68% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Probability
0.68%

47.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
RedhatBuild Of Apache Camel - Hawtio4.0
RedhatBuild Of Apache Camel For Spring Boot4.0
RedhatData Grid8.0
RedhatFuse7.0.0
RedhatJboss Enterprise Application Platform7.0.0
RedhatJboss Enterprise Application Platform8.0.0
RedhatJboss Enterprise Application Platform Expansion PackAll versions
RedhatProcess Automation7.0
RedhatSingle Sign-On7.0
RedhatUndertowAll versions
RedhatEnterprise Linux9.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2026-28369?
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.
How severe is CVE-2026-28369?
CVE-2026-28369 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.68% probability of exploitation in the next 30 days.
How do I fix CVE-2026-28369?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-28369?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST