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MEDIUM

CVE-2026-93573

CVSS v3

6.5

MEDIUM

EPSS Score

0.9 %

exploit probability, as of 2026-10-17

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-93573 Red Hat Product Security3 products fixed · 11 known affected

    io.netty/netty-codec-http: Netty split Transfer-Encoding fields bypass final-chunked validation and enable request smuggling

    netty-codec-http as a component of Red Hat AMQ Broker 7 · netty-codec-http as a component of Red Hat AMQ Clients · netty-codec-http as a component of Red Hat build of Apache Camel 4 for Quarkus 3

  • RHSA-2026:83612 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat build of Debezium 3.6.3 release

  • RHSA-2026:69440 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat build of Quarkus 3.33.3.SP2 release and security update

  • RHSA-2026:69470 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat build of Quarkus 3.27.5.SP2 release and security update

Full record on NVD

Description

A flaw was found in Netty's HTTP/1.1 decoder. This vulnerability allows a remote attacker to bypass `Transfer-Encoding` header validation by splitting the `Transfer-Encoding` field across multiple headers, with the last field containing a non-final transfer coding like `gzip` or `deflate`. This bypass can lead to HTTP request smuggling, enabling attackers to bypass security controls, desynchronize request processing, or cause requests to be processed in an unintended context.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Published
2026-09-18
Last Modified
2026-09-18

Frequently asked questions

What is CVE-2026-93573?

A flaw was found in Netty's HTTP/1.1 decoder. This vulnerability allows a remote attacker to bypass `Transfer-Encoding` header validation by splitting the `Transfer-Encoding` field across multiple headers, with the last field containing a non-final transfer coding like `gzip` or `deflate`. This bypass can lead to HTTP request smuggling, enabling attackers to bypass security controls, desynchronize request processing, or cause requests to be processed in an unintended context.

Is CVE-2026-93573 actively exploited?

Active exploitation of CVE-2026-93573 has not been confirmed. Its EPSS score was 0.9% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-93573?

CVE-2026-93573 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

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