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    CVE-2026-33870

    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.

    Published:Mar 27, 2026
    Last Modified:Sep 9, 2026
    EPS:Mar 27, 2026
    EPSS Score:0.0064
    CVSS Score:7.5

    Affected Products

    Vendor
    Netty
    Product
    Netty

    Exploits

    https://github.com/netty/netty/security/advisories/GHSA-pwqr-wmgm-9rr8

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-273 HTTP Response Smuggling
    CAPEC-33 HTTP Request Smuggling

    Related CVEs

    CVE-2026-89044 (CVSS 6.9) — Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly vali…
    CVE-2026-76816 (CVSS 3.5) — Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.137.Final and 4.2.…
    CVE-2026-62380 (CVSS 6.3) — Netty (io.netty:netty-codec-socks) versions 4.2.0.Final through 4.2.16.Final and 4.1.x through 4.1.136.Final c…
    CVE-2026-62243 (CVSS 8.7) — Netty (io.netty:netty-handler) versions from 4.2.0.Final through 4.2.16.Final and versions through 4.1.136.Fin…
    CVE-2026-75595 (CVSS 9.1) — Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Fina and 4.2.17.Final, …
    CVE-2026-75596 (CVSS 8.7) — Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final,…
    CVE-2026-59903 (CVSS 6.5) — Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final,…
    CVE-2026-59902 (CVSS 7.5) — Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final,…
    CVE-2026-73508 (CVSS 5.3) — Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final,…
    CVE-2026-73507 (CVSS 7.5) — Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final,…

    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/errata/RHSA-2026:10175
    https://access.redhat.com/errata/RHSA-2026:10184
    https://access.redhat.com/errata/RHSA-2026:13571
    https://access.redhat.com/errata/RHSA-2026:14272
    https://access.redhat.com/errata/RHSA-2026:14276
    https://access.redhat.com/errata/RHSA-2026:17668
    https://access.redhat.com/errata/RHSA-2026:17789
    https://access.redhat.com/errata/RHSA-2026:18054
    https://access.redhat.com/errata/RHSA-2026:18055
    https://access.redhat.com/errata/RHSA-2026:18059
    https://access.redhat.com/errata/RHSA-2026:22619
    https://access.redhat.com/errata/RHSA-2026:34608
    https://access.redhat.com/errata/RHSA-2026:65126
    https://access.redhat.com/errata/RHSA-2026:7109
    https://access.redhat.com/errata/RHSA-2026:7380
    https://access.redhat.com/errata/RHSA-2026:8159
    https://access.redhat.com/errata/RHSA-2026:8509
    https://access.redhat.com/security/cve/CVE-2026-33870
    https://bugzilla.redhat.com/show_bug.cgi?id=2452453
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33870.json

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High