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CVE-2026-28367 — Vulnerability in io.undertow:undertow-parent —...

HIGH

Undertow is Vulnerable to HTTP Request/Response Smuggling

Published March 27, 2026Updated September 10, 2026Source: osv

Summary

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.

Advisory Timeline

  • First published March 27, 2026 (199 days ago).
  • Last revised September 10, 2026 — 166 days after initial publication.

Affected Packages (1)

Affects 1 ecosystem: maven (1).

PackageEcosystemAffectedFixed In
io.undertow:undertow-parent
maven
1.0.0.Alpha1, 1.0.0.Alpha10, 1.0.0.Alpha11, 1.0.0.Alpha12 (+332 more)Range-based data available

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.7 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

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

References

Frequently Asked Questions

What is CVE-2026-28367?
Undertow is Vulnerable to HTTP Request/Response Smuggling This vulnerability has been assigned a severity rating of HIGH (CVSS score: 8.7/10).
How do I check if my project is affected by CVE-2026-28367?
CVE-2026-28367 affects io.undertow:undertow-parent. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-28367 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
8.7

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-3gv6-g396-9v4r

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