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MEDIUM

CVE-2026-93574

CVSS v3

6.5

MEDIUM

EPSS Score

1.4 %

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-2026-93574 Red Hat Product Security3 products fixed · 11 known affected

    io.netty/netty-codec-http: Netty: HTTP request smuggling via post-digit whitespace in chunk-size parsing

    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 `netty-codec-http` component. A remote attacker could exploit this vulnerability by sending a specially crafted HTTP/1.1 chunk-size token that includes post-digit whitespace. This incorrect parsing of the chunk size can lead to HTTP request smuggling. This allows an attacker to bypass security controls or access unauthorized resources in proxy/backend deployments.

Technical details

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

Frequently asked questions

What is CVE-2026-93574?

A flaw was found in Netty's `netty-codec-http` component. A remote attacker could exploit this vulnerability by sending a specially crafted HTTP/1.1 chunk-size token that includes post-digit whitespace. This incorrect parsing of the chunk size can lead to HTTP request smuggling. This allows an attacker to bypass security controls or access unauthorized resources in proxy/backend deployments.

Is CVE-2026-93574 actively exploited?

Active exploitation of CVE-2026-93574 has not been confirmed. Its EPSS score was 1.4% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-93574?

CVE-2026-93574 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:N/I:L/A:L.

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