CVE-2026-56746High· 7.5▾ TwilightA flaw was found in Netty, a network application framework. A remote attacker can bypass security controls in the `CorsHandler` component by sending a specially crafted request with a null origin header. This bypasses the intended access r…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Exploit-prediction probability, daily snapshots since Jul 22.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.5%
7.5 → 6.5
high → medium
6.5 → 7.5
medium → high
7.5 → 6.5
high → medium
6.5 → 7.5
medium → high
7.5 → 6.5
high → medium
6.5 → 7.5
medium → high
Last analysed / modified upstream
A flaw was found in Netty, a network application framework. A remote attacker can bypass security controls in the CorsHandler component by sending a specially crafted request with a null origin header. This bypasses the intended access restrictions, allowing unauthorized requests to reach the backend application. This could lead to a compromise of data integrity by allowing unauthorized actions.
io.netty/netty-codec-http: Netty: Security control bypass allows unauthorized requests via null origin header — rated Important by Red Hat. Released 2026-07-21, updated 2026-09-21.
Affected:
Fixed:
No fix planned:
Not affected:
Before applying this update, make sure all previously released errata relevant to your system have been applied.
For details on how to apply this update, refer to:
https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:68333 Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings.
The References section of this erratum contains a download link (you must log in to download the update). https://access.redhat.com/errata/RHSA-2026:66545 Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings.
The References section of this erratum contains a download link (you must log in to download the update). https://access.redhat.com/errata/RHSA-2026:66488
Workarounds / mitigations:
Affected packages:
io.netty:netty-codec-http >= 4.2.0.Final, < 4.2.16.Finalio.netty:netty-codec-http < 4.1.136.FinalPatched in:
io.netty:netty-codec-http 4.2.16.Finalio.netty:netty-codec-http 4.1.136.FinalField changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-56819High· 7.5io.netty/netty-codec-http2: Netty: Denial of Service via HTTP/2 DATA frame memory leak (CVE-2026-56819)
CVE-2026-10050Critical· 9.1jetty-security: Eclipse Jetty: Authentication bypass via Digest authentication encoding collision (CVE-2026-10050)
CVE-2026-55831High· 7.5io.netty/netty-codec-http: Netty: Denial of Service via SPDY SETTINGS frame processing (CVE-2026-55831)
CVE-2026-55833High· 7.5netty: io.netty/netty-codec-http: Netty: Denial of Service via SPDY header decompression amplification (CVE-2026-55833)
CVE-2026-56745High· 7.5netty: io.netty/netty-codec-http: Netty: Denial of Service via memory exhaustion in SPDY-to-HTTP codec (CVE-2026-56745)
CVE-2026-59899High· 7.5io.netty/netty-codec-http: Netty: Memory exhaustion in netty-codec-http (decompression bomb) (CVE-2026-59899)