# CVE-2026-33870: Netty: HTTP Request Smuggling via Chunked Extension Quoted-String Parsing

> CVE-2026-33870: Netty: HTTP Request Smuggling via Chunked Extension Quoted-String Parsing. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-33870
Last updated: 2026-09-15T12:04:28Z

- Published: 2026-03-27 19:54 UTC · Updated: 2026-09-15 12:04 UTC · Assigner: GitHub\_M
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS: 0.70%, 53th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-444

## 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.

## Affected vendors and products

- netty: netty
- Red Hat: Cryostat 4 on RHEL 9
- Red Hat: Logging Subsystem for Red Hat OpenShift
- Red Hat: OpenShift Serverless
- Red Hat: Red Hat AMQ Broker 7.12.7
- Red Hat: Red Hat AMQ Broker 7.13.5
- Red Hat: Red Hat AMQ Broker 7.14.0
- Red Hat: Red Hat AMQ Clients
- Red Hat: Red Hat Build of Apache Camel 4.14 for Quarkus 3.27
- Red Hat: Red Hat build of Apache Camel 4.18.1 for Spring Boot 3.5.14
- Red Hat: Red Hat build of Apache Camel 4 for Quarkus 3
- Red Hat: Red Hat build of Apache Camel - HawtIO 4
- Red Hat: Red Hat build of Apicurio Registry 2
- Red Hat: Red Hat build of Apicurio Registry 3
- Red Hat: Red Hat build of Debezium 3
- Red Hat: Red Hat Build of Keycloak
- Red Hat: Red Hat build of OptaPlanner 8
- Red Hat: Red Hat build of Quarkus 3.20.6
- Red Hat: Red Hat build of Quarkus 3.27.3
- Red Hat: Red Hat Data Grid 8.6.1
- Red Hat: Red Hat Enterprise Linux AI (RHEL AI) 3
- Red Hat: Red Hat Fuse 7
- Red Hat: Red Hat JBoss Enterprise Application Platform 7
- Red Hat: Red Hat JBoss Enterprise Application Platform 8.1
- Red Hat: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
- Red Hat: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
- Red Hat: Red Hat JBoss Enterprise Application Platform Expansion Pack
- Red Hat: Red Hat OpenShift AI 2.25
- Red Hat: Red Hat OpenShift AI (RHOAI)
- Red Hat: Red Hat OpenShift Dev Spaces 3.27
- Red Hat: Red Hat Process Automation 7
- Red Hat: Red Hat Satellite 6
- Red Hat: Red Hat Single Sign-On 7
- Red Hat: Streams for Apache Kafka 2.9.4
- Red Hat: streams for Apache Kafka 3
- Red Hat: Streams for Apache Kafka 3.2.0

## Tracked companies

- [Bitbucket](https://rewindex.com/company/bitbucket.md)
- [Confluence](https://rewindex.com/company/confluence.md)
- [Jira](https://rewindex.com/company/jira.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-33870)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-33870)
- [https://github.com/netty/netty/security/advisories/GHSA-pwqr-wmgm-9rr8](https://github.com/netty/netty/security/advisories/GHSA-pwqr-wmgm-9rr8)
- [https://w4ke.info/2025/06/18/funky-chunks.html](https://w4ke.info/2025/06/18/funky-chunks.html)
- [https://w4ke.info/2025/10/29/funky-chunks-2.html](https://w4ke.info/2025/10/29/funky-chunks-2.html)
- [https://www.rfc-editor.org/rfc/rfc9110](https://www.rfc-editor.org/rfc/rfc9110)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-33870 · Markdown: https://rewindex.com/cve/CVE-2026-33870.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-33870 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:04.466Z