io.netty/netty-codec-http: Netty: Request smuggling via incorrect parsing of HTTP/1.1 chunked transfer encoding extension values
cve CVE-2026-33870 2 sources, 2 claims · Watch
Red Hat writes:
io.netty/netty-codec-http: Netty: Request smuggling via incorrect parsing of HTTP/1.1 chunked transfer encoding extension values the claim
io.netty/netty-codec-http: Netty: Request smuggling via incorrect parsing of HTTP/1.1 chunked transfer encoding extension values the claim
- Severity
- HIGH NVDimportant Red Hat
- CVSS
- 7.5 NVD7.5 Red Hat
- Vendor
- netty NVD
- Product
- netty NVD
- CWE
- CWE-444 NVDCWE-444 Red Hat
How far exploitation has got
- No public code known
- Proof of concept
- Proof of concept, verified
- A Metasploit module
- Exploited in the wild
- Used in ransomware campaigns
Timeline
| 2026-03-27 | first spoke of it: Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, Netty incorrectly parses quoted strings in HTTP/1.1 chunked transfer encoding extension values, enabling request smuggling attacks. Versions 4.1.132.Final and 4.2.10.Final fix the issue. | NVD |
| 2026-03-27 | first spoke of it: io.netty/netty-codec-http: Netty: Request smuggling via incorrect parsing of HTTP/1.1 chunked transfer encoding extension values | Red Hat |
What it is to other things
| affects | netty/netty NVD |
| made_by | netty NVD |
Every value, with what each source said and its receipt
| Property | Source | Said | Means here | ||||
|---|---|---|---|---|---|---|---|
| Automatable automatable | NVD | yes An attacker can reliably run all of the kill chain's first four steps without a person. receipt
What the source handed over{
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} | — | ||||
| CVSS cvss | NVD | 7.5receipt
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} | — | ||||
| CVSS cvss | Red Hat | 7.5receipt
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} | — | ||||
| CVSS vector cvss_vector | NVD | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nreceipt
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} | — | ||||
| CVSS vector cvss_vector | Red Hat | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nreceipt
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"severity": "important"
} | — | ||||
| CWE cwe | NVD | CWE-444receipt
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} | — | ||||
| CWE cwe | Red Hat | CWE-444receipt
What the source handed over{
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"severity": "important"
} | — | ||||
| Exploitation exploitation | NVD | poc A public proof of concept exists, or exploitation is trivial. receipt
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{
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} | — | ||||
| Packages packages | Red Hat | io.netty/netty-codec-http:4.1.132.Final-redhat-00001, eap8-netty-transport-native-epoll-0:4.1.132-1.Final_redhat_00001.1.el8eap, rhoai/odh-modelmesh-rhel9:1776756834, cryostat/jfr-datasource-rhel9:4.2.0-9, rhoai/odh-trustyai-service-rhel9:1788198681, eap8-netty-0:4.1.132-1.Final_redhat_00001.1.el8eap, eap8-netty-0:4.1.132-1.Final_redhat_00001.1.el9eap, eap8-netty-transport-native-epoll-0:4.1.132-1.Final_redhat_00001.1.el9eap, cryostat/cryostat-rhel9:4.2.0-9, devspaces/openvsx-rhel9:1776716842, devspaces/pluginregistry-rhel9:1776717247, netty-codec-http, devspaces/server-rhel9:1776796445, cryostat/cryostat-reports-rhel9:4.2.0-9receipt
What the source handed over{
"CVE": "CVE-2026-33870",
"CWE": "CWE-444",
"advisories": [
"RHSA-2026:7109",
"RHSA-2026:34608",
"RHSA-2026:18054",
"RHSA-2026:18055",
"RHSA-2026:10175",
"RHSA-2026:17789",
"RHSA-2026:17668",
"RHSA-2026:18059",
"RHSA-2026:14276",
"RHSA-2026:13571",
"RHSA-2026:69459",
"RHSA-2026:10184",
"RHSA-2026:65126",
"RHSA-2026:22619",
"RHSA-2026:7380"
],
"affected_packages": [
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"eap8-netty-transport-native-epoll-0:4.1.132-1.Final_redhat_00001.1.el8eap",
"rhoai/odh-modelmesh-rhel9:1776756834",
"cryostat/jfr-datasource-rhel9:4.2.0-9",
"rhoai/odh-trustyai-service-rhel9:1788198681",
"eap8-netty-0:4.1.132-1.Final_redhat_00001.1.el8eap",
"eap8-netty-0:4.1.132-1.Final_redhat_00001.1.el9eap",
"eap8-netty-transport-native-epoll-0:4.1.132-1.Final_redhat_00001.1.el9eap",
"cryostat/cryostat-rhel9:4.2.0-9",
"devspaces/openvsx-rhel9:1776716842",
"devspaces/pluginregistry-rhel9:1776717247",
"netty-codec-http",
"devspaces/server-rhel9:1776796445",
"cryostat/cryostat-reports-rhel9:4.2.0-9"
],
"bugzilla": "2452453",
"bugzilla_description": "io.netty/netty-codec-http: Netty: Request smuggling via incorrect parsing of HTTP/1.1 chunked transfer encoding extension values",
"cvss3_score": "7.5",
"cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"cvss_score": null,
"cvss_scoring_vector": null,
"package_state": null,
"public_date": "2026-03-27T19:54:15Z",
"resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33870.json",
"severity": "important"
} | — | ||||
| Product product | NVD | nettyreceipt
What the source handed over{
"cve": {
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{
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{
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"vendor": "netty",
"versions": [
{
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},
{
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}
]
}
],
"source": "security-advisories@github.com"
},
{
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],
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"product": "Cryostat 4 on RHEL 9",
"vendor": "Red Hat",
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{
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"version": "4.2.0-9",
"versionType": "rpm"
}
]
},
{
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"cpes": [
"cpe:/a:redhat:cryostat:4::el9"
],
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"product": "Cryostat 4 on RHEL 9",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "4.2.0-9",
"versionType": "rpm"
}
]
},
{
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"cpe:/a:redhat:cryostat:4::el9"
],
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"product": "Cryostat 4 on RHEL 9",
"vendor": "Red Hat",
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{
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"status": "unaffected",
"version": "4.2.0-9",
"versionType": "rpm"
}
]
},
{
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],
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"vendor": "Red Hat",
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}
]
},
{
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]
},
{
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},
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},
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{
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} | — | ||||
| Severity severity | NVD | HIGH From 7.0 to 8.9. receipt
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{
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{
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{
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{
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{
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{
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{
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}
} | high | ||||
| Severity severity | Red Hat | important A flaw that can easily compromise confidentiality, integrity or availability. receipt
What the source handed over{
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"CWE": "CWE-444",
"advisories": [
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"RHSA-2026:34608",
"RHSA-2026:18054",
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"RHSA-2026:10175",
"RHSA-2026:17789",
"RHSA-2026:17668",
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"RHSA-2026:14276",
"RHSA-2026:13571",
"RHSA-2026:69459",
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"cvss3_score": "7.5",
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"cvss_score": null,
"cvss_scoring_vector": null,
"package_state": null,
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"resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33870.json",
"severity": "important"
} | high | ||||
| Status status | NVD | Modifiedreceipt
What the source handed over{
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} | — | ||||
| Technical impact technical_impact | NVD | partial The attacker gains limited control, or limited information. receipt
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} | — | ||||
| Vendor vendor | NVD | nettyreceipt
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} | — |
Every claim, by kind
vulnerability
| io.netty/netty-codec-http: Netty: Request smuggling via incorrect parsing of HTTP/1.1 chunked transfer encoding extension values zetlyn/cve-redhat · 2026-03-27 | cvss 7.5 cvss_vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N cwe CWE-444 packages io.netty/netty-codec-http:4.1.132.Final-redhat-00001, eap8-netty-transport-native-epoll-0:4.1.132-1.Final_redhat_00001.1.el8eap, rhoai/odh-modelmesh-rhel9:1776756834, cryostat/jfr-datasource-rhel9:4.2.0-9, rhoai/odh-trustyai-service-rhel9:1788198681, eap8-netty-0:4.1.132-1.Final_redhat_00001.1.el8eap, eap8-netty-0:4.1.132-1.Final_redhat_00001.1.el9eap, eap8-netty-transport-native-epoll-0:4.1.132-1.Final_redhat_00001.1.el9eap, cryostat/cryostat-rhel9:4.2.0-9, devspaces/openvsx-rhel9:1776716842, devspaces/pluginregistry-rhel9:1776717247, netty-codec-http, devspaces/server-rhel9:1776796445, cryostat/cryostat-reports-rhel9:4.2.0-9 severity important | source |
| Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, Netty incorrectly parses quoted strings in HTTP/1.1 chunked transfer encoding extension values, enabling request smuggling attacks. Versions 4.1.132.Final and 4.2.10.Final fix the issue. zetlyn/cve-nvd · 2026-03-27 | automatable yes cvss 7.5 cvss_vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N cwe CWE-444 exploitation poc product netty severity HIGH status Modified technical_impact partial vendor netty | source |