CVE-2026-33870
Netty: HTTP Request Smuggling via Chunked Extension Quoted-String Parsing
CVSS Score
7.5
EPSS Score
0.6%
EPSS Percentile
46th
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.
| CWE | CWE-444 |
| Vendor | netty |
| Product | netty |
| Published | Mar 27, 2026 |
| Last Updated | Jul 15, 2026 |
Stay Ahead of the Next One
Get instant alerts for netty netty
Be the first to know when new high vulnerabilities affecting netty netty are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Affected Versions
netty / netty
< 4.1.132.Final >= 4.2.0.Alpha1, < 4.2.10.Final
References
github.com: https://github.com/netty/netty/security/advisories/GHSA-pwqr-wmgm-9rr8 w4ke.info: https://w4ke.info/2025/06/18/funky-chunks.html w4ke.info: https://w4ke.info/2025/10/29/funky-chunks-2.html rfc-editor.org: https://www.rfc-editor.org/rfc/rfc9110 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-33870 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2452453 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33870.json access.redhat.com: https://access.redhat.com/errata/RHSA-2026:18054 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:17789 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:18055 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:14276 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:14272 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:8509 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:8159 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:22619 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:18059 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:10184 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:10175 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:17668 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:7109 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:7380 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:34608 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:13571