CVE-2026-33870
Netty: HTTP Request Smuggling via Chunked Extension Quoted-String Parsing
- State
- Published
- Severity
- 7.5 High
- Published
- Mar 27, 2026
- Updated
- Sep 15, 2026
- Reserved
- Mar 24, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N | GitHub_M |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N | redhat-SADP |
Weaknesses
- CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Affected Products
| Product | Versions |
|---|---|
nettynetty |
|
References
- https://github.com/netty/netty/security/advisories/GHSA-pwqr-wmgm-9rr8
- https://w4ke.info/2025/06/18/funky-chunks.html
- https://w4ke.info/2025/10/29/funky-chunks-2.html
- https://www.rfc-editor.org/rfc/rfc9110
- https://access.redhat.com/security/cve/CVE-2026-33870vdb-entry
- RHBZ#2452453issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33870.json
- https://access.redhat.com/errata/RHSA-2026:18054vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:17789vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:18055vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:14276vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:14272vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:8509vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:8159vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:22619vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:18059vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:10184vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:65126vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:10175vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:17668vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7109vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:7380vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:34608vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:13571vendor-advisory
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