Highest advisory severityHigh 2 vendors · 2 advisories

CVE-2026-56746

Security control bypass allows unauthorized requests via null origin header

CVE-2026-56746: Security control bypass allows unauthorized requests via null origin header. Not in the CISA KEV catalog.

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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CVE-2026-56746 key facts

CISA KEV: Not listed (catalog checked Nov 6, 2026)
Highest advisory severity: High
CVSS base score: 7.5 (Red Hat)
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N (Red Hat)
Weakness: CWE-807
Fixed releases: Red Hat: 4.1.136, 4.2.16, cryostat/cryostat-reports-rhel9:4.2.0-14, cryostat/cryostat-rhel9:4.2.0-14, cryostat/jfr-datasource-rhel9:4.2.0-14, netty-codec-http and 44 more in the advisory
Vendor advisories: 2 from NetApp, Red Hat
VulniPulse record: Published Jul 28, 2026 · Updated Sep 29, 2026

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-56746; bulletin-wide values are not repeated here.

Is CVE-2026-56746 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-56746 is not in the CISA KEV catalog (checked Nov 6, 2026) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-56746?

Upgrade to a fixed release named by the vendor:

Red Hat: 4.1.136, 4.2.16, cryostat/cryostat-reports-rhel9:4.2.0-14, cryostat/cryostat-rhel9:4.2.0-14, cryostat/jfr-datasource-rhel9:4.2.0-14, netty-codec-http

If CORS short-circuit functionality is not required, disable the shortCircuit() configuration in the CorsHandler. Alternatively, implement application-level origin validation to reject requests with null Origin headers. A web application firewall (WAF) can also be configured to block requests with null or missing Origin headers. (Red Hat)

Vendor advisory comparison

NetApp

1 advisory

Advisory severityHigh8.1
High [CVE-2026-44249 +6] September 2026 IBM Db2 Netty Vulnerabilities in NetApp Products
NTAP-20260917-0005Source published Sep 17, 2026Source updated Sep 29, 2026
This bulletin covers 7 CVEs. The products, versions, score and guidance below describe the bulletin; check its source for applicability to this specific CVE.
IBM Db2 Server 11.5.0 through 11.5.9 on Linux x86-64 are susceptible to vulnerabilities in Netty open source libraries. Successful exploitation of these vulnerabilities could lead to disclosure of sensitive information, addition or modification of data, or Denial of Service (DoS). NetApp states there is no workaround available at this time.
Affected products in this advisory
No product details extracted. Check the source bulletin.
Source-reported affected versions
11.5.0
11.5.9
Source-reported fixed versions
No fixed-version detail extracted. This does not mean no fix exists.
Mitigation guidance
No mitigation guidance extracted; consult the source.
Full advisory and evidence Open source bulletin

Red Hat

1 advisory

Advisory severityHigh7.5
High [CVE-2026-56746] Security control bypass allows unauthorized requests via null origin header
CVE-2026-56746Source published Jul 21, 2026Source updated Jul 21, 2026
Netty is a network application framework for development of protocol servers and clients. Versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, are vulnerable to security control bypass during the origin evaluation process. CorsHandler provides a shortCircuit() configuration designed to reject unauthorized cross-origin requests immediately, acting as a security control before requests reach the application. However, due to a logical operator error in the origin evaluation process, this protection can be entirely bypassed. An attacker can bypass the short-circuit mechanism by sending a request with an Origin: null header. This failure forwards unauthorized requests to the backend application, bypassing intended access controls. This issue is fixed in versions…
Affected products in this advisory
Cryostat 4 on RHEL 9
Red Hat AMQ Broker 7.13.6
Red Hat AMQ Broker 7.14.1
Red Hat Build of Apache Camel 3.33.2.SP3
25 more entries in the full advisory.
Source-reported affected versions
4.2.0
4.2.15
4.1.0
4.1.135
Source-reported fixed versions
4.1.136
4.2.16
cryostat/cryostat-reports-rhel9:4.2.0-14
cryostat/cryostat-rhel9:4.2.0-14
46 more entries in the full advisory.
Mitigation guidance
If CORS short-circuit functionality is not required, disable the shortCircuit() configuration in the CorsHandler. Alternatively, implement application-level origin validation to reject requests with null Origin headers. A web application firewall (WAF) can also be configured to block requests with null or missing Origin headers.
Full advisory and evidence Open source bulletin

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