Netty: HTTP Request Smuggling via Chunked Extension Quoted-String Parsing

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Summary

CVECVE-2026-33870
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-27 20:16:34 UTC
Updated2026-03-30 20:12:16 UTC
DescriptionNetty 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Problem Types: CWE-444 | CWE-444 CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Netty Netty All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Netty Netty affected < 4.1.132.Final Not specified
CNA Netty Netty affected >= 4.2.0.Alpha1, < 4.2.10.Final Not specified

References

ReferenceSourceLinkTags
w4ke.info/2025/10/29/funky-chunks-2.html [email protected] w4ke.info Technical Description
github.com/netty/netty/security/advisories/GHSA-pwqr-wmgm-9rr8 [email protected] github.com Exploit, Mitigation, Vendor Advisory
w4ke.info/2025/06/18/funky-chunks.html [email protected] w4ke.info Technical Description
www.rfc-editor.org/rfc/rfc9110 [email protected] www.rfc-editor.org Technical Description
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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