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VulnerabilityPublished Updated

CVE-2026-28369: Red Hat JBoss Enterprise Application Platform 8.1.6 jboss-eap · HTTP Request/Response Smuggling

Affects Red Hat JBoss Enterprise Application Platform 8.1.6 jboss-eapSource CVE Database V5

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Not known to be exploited · CVSS 8.7 High : upgrade the Red Hat redhat/jboss-eap package to 8.1.6 soon.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
8.7High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.6% chance of exploitation in 30 days – higher than 52% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 8.1.6
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 27 Mar 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade the Red Hat redhat/jboss-eap package to 8.1.6.

Affected software

ProductAffectedFixed in
Red Hatredhat/jboss-eappkg:rpm/redhat/jboss-eapOther threatsAffected
  • <8.1.6
Fixed in
  • 8.1.6

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Red Hat has released an official security update in Red Hat JBoss Enterprise Application Platform version 8.1.6 that addresses this vulnerability. Users should apply this update promptly. Before updating, ensure all previous errata are applied and back up existing installations, including applications, configurations, and databases. No other mitigations are specified by the vendor. Patch status is confirmed by Red Hat advisories RHSA-2026:25125 and RHSA-2026:25126.

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.

References

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