Vulnerability-Lookup

CVE-2026-28368 (GCVE-0-2026-28368)

Vulnerability from cvelistv5 – Published: 2026-03-27 16:13 – Updated: 2026-06-29 09:26

Title

Undertow: undertow: request smuggling via inconsistent header parsing

Summary

A flaw was found in Undertow. This vulnerability allows a remote attacker to construct specially crafted requests where header names are parsed differently by Undertow compared to upstream proxies. This discrepancy in header interpretation can be exploited to launch request smuggling attacks, potentially bypassing security controls and accessing unauthorized resources.

Severity

8.7 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-27 18:49 UTC

CWE

CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Assigner

redhat redhat root

References

4 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:25125	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25126	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-28368	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2443261	issue-trackingx_refsource_REDHAT

Impacted products

21 products

Vendor	Product	Version
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1	cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	Unaffected: 0:2.40.0-7.redhat_00015.1.el8eap , < * (rpm) cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8 cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	Unaffected: 0:801.6.1-1.GA_redhat_00001.1.el8eap , < * (rpm) cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8 cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	Unaffected: 0:2.3.24-3.SP2_redhat_00001.1.el8eap , < * (rpm) cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8 cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8	Unaffected: 0:8.1.6-7.GA_redhat_00010.1.el8eap , < * (rpm) cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8 cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	Unaffected: 0:2.40.0-7.redhat_00015.1.el9eap , < * (rpm) cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8 cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	Unaffected: 0:801.6.1-1.GA_redhat_00001.1.el9eap , < * (rpm) cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8 cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	Unaffected: 0:2.3.24-3.SP2_redhat_00001.1.el9eap , < * (rpm) cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8 cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
Red Hat	Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9	Unaffected: 0:8.1.6-7.GA_redhat_00010.1.el9eap , < * (rpm) cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8 cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
Red Hat	Red Hat build of Apache Camel for Spring Boot 4	cpe:/a:redhat:camel_spring_boot:4
Red Hat	Red Hat build of Apache Camel - HawtIO 4	cpe:/a:redhat:apache_camel_hawtio:4
Red Hat	Red Hat Data Grid 8	cpe:/a:redhat:jboss_data_grid:8
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat Fuse 7	cpe:/a:redhat:jboss_fuse:7
Red Hat	Red Hat JBoss Enterprise Application Platform 7	cpe:/a:redhat:jboss_enterprise_application_platform:7
Red Hat	Red Hat JBoss Enterprise Application Platform 8	cpe:/a:redhat:jboss_enterprise_application_platform:8
Red Hat	Red Hat JBoss Enterprise Application Platform Expansion Pack	cpe:/a:redhat:jbosseapxp
Red Hat	Red Hat Process Automation 7	cpe:/a:redhat:jboss_enterprise_bpms_platform:7
Red Hat	Red Hat Single Sign-On 7	cpe:/a:redhat:red_hat_single_sign_on:7

Date Public

2025-08-27 00:00

Show details on NVD website

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FKIE_CVE-2026-28368

Vulnerability from fkie_nvd - Published: 2026-03-27 17:16 - Updated: 2026-06-29 10:16

Severity

8.7 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Summary

References

URL	Tags
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:25125
secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:25126
secalert@redhat.com	https://access.redhat.com/security/cve/CVE-2026-28368	Vendor Advisory
secalert@redhat.com	https://bugzilla.redhat.com/show_bug.cgi?id=2443261	Issue Tracking, Vendor Advisory

Impacted products

Vendor	Product	Version
redhat	build_of_apache_camel_-_hawtio	4.0
redhat	build_of_apache_camel_for_spring_boot	4.0
redhat	data_grid	8.0
redhat	fuse	7.0.0
redhat	jboss_enterprise_application_platform	7.0.0
redhat	jboss_enterprise_application_platform	8.0.0
redhat	jboss_enterprise_application_platform_expansion_pack	-
redhat	process_automation	7.0
redhat	single_sign-on	7.0
redhat	undertow	-
redhat	enterprise_linux	9.0

JSON

To clipboard

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      ],
      "url": "https://access.redhat.com/security/cve/CVE-2026-28368"
    },
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Issue Tracking",
        "Vendor Advisory"
      ],
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2443261"
    }
  ],
  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-444"
        }
      ],
      "source": "secalert@redhat.com",
      "type": "Secondary"
    }
  ]
}

GHSA-8V4X-MGVP-P658

Vulnerability from github – Published: 2026-03-27 18:31 – Updated: 2026-06-11 00:32

Summary

Undertow is Vulnerable to HTTP Request/Response Smuggling

Details

Severity

8.7 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "io.undertow:undertow-parent"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "2.3.23.Final"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-28368"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-444"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-31T23:14:15Z",
    "nvd_published_at": "2026-03-27T17:16:27Z",
    "severity": "HIGH"
  },
  "details": "A flaw was found in Undertow. This vulnerability allows a remote attacker to construct specially crafted requests where header names are parsed differently by Undertow compared to upstream proxies. This discrepancy in header interpretation can be exploited to launch request smuggling attacks, potentially bypassing security controls and accessing unauthorized resources.",
  "id": "GHSA-8v4x-mgvp-p658",
  "modified": "2026-06-11T00:32:03Z",
  "published": "2026-03-27T18:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28368"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:25125"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:25126"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-28368"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2443261"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/undertow-io/undertow"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Undertow is Vulnerable to HTTP Request/Response Smuggling"
}

RHSA-2026:25125

Vulnerability from csaf_redhat - Published: 2026-06-10 20:29 - Updated: 2026-09-16 11:55

Summary

Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.6 security update

Severity

Important

Scope

4 vulnerabilities in this advisory, including CVE-2026-28368.

CVE-2026-28368

8.7 (High)


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

Fixed: 52 products

https://access.redhat.com/errata/RHSA-2026:25125

Open the full advisory

RHSA-2026:25126

Vulnerability from csaf_redhat - Published: 2026-06-10 20:25 - Updated: 2026-09-06 22:24

Summary

Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.6 security update

Severity

Important

Scope

4 vulnerabilities in this advisory, including CVE-2026-28368.

CVE-2026-28368

8.7 (High)


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

Fixed: 1 product

https://access.redhat.com/errata/RHSA-2026:25126

Open the full advisory

ubuntu-cve-2026-28368

Vulnerability from osv_ubuntu

Published

2026-03-27 17:16

Modified

2026-05-20 15:26

Summary

Details

Severity

8.7 (High)


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

9.1 (Critical)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-28368	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-28368	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2443261	REPORT
	https://access.redhat.com/security/cve/CVE-2026-28368	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libundertow-java",
            "binary_version": "1.3.16-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "undertow",
        "purl": "pkg:deb/ubuntu/undertow@1.3.16-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.4-1",
        "1.3.5-1",
        "1.3.7-1",
        "1.3.11-1",
        "1.3.16-1",
        "1.3.16-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libundertow-java",
            "binary_version": "1.4.23-3ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "undertow",
        "purl": "pkg:deb/ubuntu/undertow@1.4.23-3ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.20-1",
        "1.4.21-1",
        "1.4.22-1",
        "1.4.23-1",
        "1.4.23-2build1",
        "1.4.23-3",
        "1.4.23-3ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libundertow-java",
            "binary_version": "2.0.29-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "undertow",
        "purl": "pkg:deb/ubuntu/undertow@2.0.29-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.23-1",
        "2.0.27-1",
        "2.0.28-1",
        "2.0.29-1",
        "2.0.29-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libundertow-java",
            "binary_version": "2.2.16-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "undertow",
        "purl": "pkg:deb/ubuntu/undertow@2.2.16-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.2.8-1",
        "2.2.12-1",
        "2.2.13-1",
        "2.2.14-1",
        "2.2.16-1",
        "2.2.16-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libundertow-java",
            "binary_version": "2.3.8-2ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "undertow",
        "purl": "pkg:deb/ubuntu/undertow@2.3.8-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.3.8-2",
        "2.3.8-2ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libundertow-java",
            "binary_version": "2.3.18-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "undertow",
        "purl": "pkg:deb/ubuntu/undertow@2.3.18-2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.3.18-1",
        "2.3.18-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libundertow-java",
            "binary_version": "2.3.20-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "undertow",
        "purl": "pkg:deb/ubuntu/undertow@2.3.20-1ubuntu1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.3.18-2",
        "2.3.20-1",
        "2.3.20-1ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in Undertow. This vulnerability allows a remote attacker to construct specially crafted requests where header names are parsed differently by Undertow compared to upstream proxies. This discrepancy in header interpretation can be exploited to launch request smuggling attacks, potentially bypassing security controls and accessing unauthorized resources.",
  "id": "UBUNTU-CVE-2026-28368",
  "modified": "2026-05-20T15:26:07Z",
  "published": "2026-03-27T17:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-28368"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-28368"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2443261"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-28368"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-28368"
  ]
}

WID-SEC-W-2026-0907

Vulnerability from csaf_certbund - Published: 2026-03-29 22:00 - Updated: 2026-06-10 22:00

Summary

Red Hat Undertow: Mehrere Schwachstellen ermöglichen Umgehung von Sicherheitsmaßnahmen

Severity

Hoch

Scope

3 vulnerabilities in this advisory, including CVE-2026-28368.

CVE-2026-28368

Known affected: 2 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-28368 (GCVE-0-2026-28368)

FKIE_CVE-2026-28368

GHSA-8V4X-MGVP-P658

RHSA-2026:25125

RHSA-2026:25126

ubuntu-cve-2026-28368

Vulnerability from osv_ubuntu

WID-SEC-W-2026-0907

Tags

Sightings

Nomenclature

Related by attack behaviour