PT-2026-28377 · Undertow · Undertow

Osidb Bzimport · Published 2026-03-27 · Updated 2026-06-10 · CVE-2026-28368

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions Undertow (affected versions not specified)

Description A security issue exists in Undertow that allows a remote attacker to create malicious requests. The issue stems from discrepancies in how Undertow parses header names compared to upstream proxies, which can be exploited to launch request smuggling attacks. Successful exploitation could bypass security measures and grant access to unauthorized resources.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

HTTP Request/Response Smuggling

Weakness Enumeration

CWE-444

Related Identifiers

CVE-2026-28368

GHSA-8V4X-MGVP-P658

Affected Products

Undertow

References · 15

• https://access.redhat.com/errata/RHSA-2026:25126 · Vendor Advisory
• https://access.redhat.com/security/cve/CVE-2026-28368 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-28368 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:25125 · Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2443261 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-28368 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-28368 · Security Note
• https://osv.dev/vulnerability/GHSA-8v4x-mgvp-p658 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-28368 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-28368 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-28368 · Security Note
• https://github.com/undertow-io/undertow · Note
• https://twitter.com/TheHackerWire/status/2037669885116084503 · Twitter Post
• https://twitter.com/CveFindCom/status/2037586204921610543 · Twitter Post
• https://t.me/cveNotify/166952 · Telegram Post