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Vulnerability details: VCID-s8ff-h1jq-4ygy
Vulnerability ID VCID-s8ff-h1jq-4ygy
Aliases CVE-2026-28368
GHSA-8v4x-mgvp-p658
Summary Undertow is Vulnerable to HTTP Request/Response Smuggling 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.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 8.7 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-28368.json
cvssv3.1 8.7 https://access.redhat.com/security/cve/CVE-2026-28368
generic_textual HIGH https://access.redhat.com/security/cve/CVE-2026-28368
ssvc Track https://access.redhat.com/security/cve/CVE-2026-28368
epss 0.0003 https://api.first.org/data/v1/epss?cve=CVE-2026-28368
epss 0.0003 https://api.first.org/data/v1/epss?cve=CVE-2026-28368
epss 0.0003 https://api.first.org/data/v1/epss?cve=CVE-2026-28368
epss 0.00034 https://api.first.org/data/v1/epss?cve=CVE-2026-28368
epss 0.00034 https://api.first.org/data/v1/epss?cve=CVE-2026-28368
epss 0.00108 https://api.first.org/data/v1/epss?cve=CVE-2026-28368
epss 0.00108 https://api.first.org/data/v1/epss?cve=CVE-2026-28368
epss 0.00108 https://api.first.org/data/v1/epss?cve=CVE-2026-28368
epss 0.00108 https://api.first.org/data/v1/epss?cve=CVE-2026-28368
epss 0.00108 https://api.first.org/data/v1/epss?cve=CVE-2026-28368
epss 0.00108 https://api.first.org/data/v1/epss?cve=CVE-2026-28368
epss 0.00108 https://api.first.org/data/v1/epss?cve=CVE-2026-28368
epss 0.00108 https://api.first.org/data/v1/epss?cve=CVE-2026-28368
epss 0.00108 https://api.first.org/data/v1/epss?cve=CVE-2026-28368
epss 0.00108 https://api.first.org/data/v1/epss?cve=CVE-2026-28368
cvssv3.1 8.7 https://bugzilla.redhat.com/show_bug.cgi?id=2443261
generic_textual HIGH https://bugzilla.redhat.com/show_bug.cgi?id=2443261
ssvc Track https://bugzilla.redhat.com/show_bug.cgi?id=2443261
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-8v4x-mgvp-p658
cvssv3.1 8.7 https://github.com/undertow-io/undertow
generic_textual HIGH https://github.com/undertow-io/undertow
cvssv3.1 8.7 https://nvd.nist.gov/vuln/detail/CVE-2026-28368
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2026-28368
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-28368.json
https://access.redhat.com/security/cve/CVE-2026-28368
https://api.first.org/data/v1/epss?cve=CVE-2026-28368
https://bugzilla.redhat.com/show_bug.cgi?id=2443261
https://github.com/undertow-io/undertow
https://nvd.nist.gov/vuln/detail/CVE-2026-28368
1134951 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1134951
cpe:/a:redhat:apache_camel_hawtio:4 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:apache_camel_hawtio:4
cpe:/a:redhat:camel_spring_boot:4 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:camel_spring_boot:4
cpe:/a:redhat:jboss_data_grid:8 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:jboss_data_grid:8
cpe:/a:redhat:jbosseapxp https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:jbosseapxp
cpe:/a:redhat:jboss_enterprise_application_platform:7 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:jboss_enterprise_application_platform:7
cpe:/a:redhat:jboss_enterprise_application_platform:8 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:jboss_enterprise_application_platform:8
cpe:/a:redhat:jboss_enterprise_bpms_platform:7 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:jboss_enterprise_bpms_platform:7
cpe:/a:redhat:jboss_fuse:7 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:jboss_fuse:7
cpe:/a:redhat:red_hat_single_sign_on:7 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:red_hat_single_sign_on:7
cpe:/o:redhat:enterprise_linux:10 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:8 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/o:redhat:enterprise_linux:9
GHSA-8v4x-mgvp-p658 https://github.com/advisories/GHSA-8v4x-mgvp-p658
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-28368.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

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none

required

unchanged

changed

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Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N Found at https://access.redhat.com/security/cve/CVE-2026-28368
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

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low

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none
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-03-27T18:49:45Z/ Found at https://access.redhat.com/security/cve/CVE-2026-28368
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N Found at https://bugzilla.redhat.com/show_bug.cgi?id=2443261
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-03-27T18:49:45Z/ Found at https://bugzilla.redhat.com/show_bug.cgi?id=2443261
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N Found at https://github.com/undertow-io/undertow
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-28368
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.08681
EPSS Score 0.0003
Published At April 21, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:53:25.917778+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-8v4x-mgvp-p658/GHSA-8v4x-mgvp-p658.json 38.0.0