Attestkeep
Language: English
Sign up

Vulnerabilities / CVE-2026-28369

critical

CVE-2026-28369

undertow: Undertow: Request Smuggling via Malformed HTTP Request Headers

Published Modified CWE 444
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
GHSA8.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Red Hat8.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by GHSA (high), Red Hat (high).

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.

Affected packages and fixed versions

SourcePackageFixed in
debian 14undertowno fix listed
maven::GitHub Security Advisory Mavenio.undertow:undertow-parentno fix listed
rapidfort alma 9pki-resteasy-client, pki-resteasy-core, pki-resteasy-jackson2-provider and 1 moreno fix listed
rapidfort Oracle Linux 9pki-resteasy-client, pki-resteasy-core, pki-resteasy-jackson2-provider and 1 moreno fix listed
rapidfort rocky 9resteasyno fix listed
Red Hatpki-resteasy-client, pki-resteasy-core, pki-resteasy-jackson2-provider and 3 moreno fix listed
Show all 17 entries from 6 sources
SourcePackageFixed in
debian 14undertowno fix listed
maven::GitHub Security Advisory Mavenio.undertow:undertow-parentno fix listed
rapidfort alma 9pki-resteasy-clientno fix listed
rapidfort alma 9pki-resteasy-coreno fix listed
rapidfort alma 9pki-resteasy-jackson2-providerno fix listed
rapidfort alma 9pki-resteasy-servlet-initializerno fix listed
rapidfort Oracle Linux 9pki-resteasy-clientno fix listed
rapidfort Oracle Linux 9pki-resteasy-coreno fix listed
rapidfort Oracle Linux 9pki-resteasy-jackson2-providerno fix listed
rapidfort Oracle Linux 9pki-resteasy-servlet-initializerno fix listed
rapidfort rocky 9resteasyno fix listed
Red Hatpki-resteasy-clientno fix listed
Red Hatpki-resteasy-coreno fix listed
Red Hatpki-resteasy-jackson2-providerno fix listed
Red Hatpki-resteasy-servlet-initializerno fix listed
Red Hatresteasyno fix listed
Red Hatundertow-coreno fix listed

References

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.