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Severity by source

Vendor (redhat) PRIMARY
MEDIUM
qualitative
NVD
6.5 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
vuln.today AI
6.5 MEDIUM

Unauthenticated remote crafted request (AV:N/AC:L/PR:N/UI:N); request smuggling yields limited integrity impact and possible availability effects in proxy chains, no direct confidentiality disclosure.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (redhat).

CVSS VectorNVD

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

Lifecycle Timeline

3
Metadata Corrected
Sep 18, 2026 - 21:40 vuln.today
tag: Netty added
Analysis Generated
Sep 18, 2026 - 21:05 vuln.today
CVE Published
Sep 18, 2026 - 20:12 cve.org
MEDIUM 6.5

DescriptionNVD

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.

AnalysisAI

HTTP request smuggling in Netty's netty-codec-http component lets unauthenticated remote attackers bypass front-end security controls by sending a crafted HTTP/1.1 chunk-size token containing whitespace after the hexadecimal digits, which Netty parses differently from other HTTP intermediaries. The flaw carries a CVSS 3.1 base score of 6.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L), meaning no authentication or user interaction is required, but integrity and availability impact is limited; meaningful exploitation generally depends on a multi-tier topology where a proxy, load balancer, or backend parses the chunk-size token inconsistently with Netty. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
technique details hidden
Delivery
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires the Netty-based service to process HTTP/1.1 chunked transfer-encoding and, for meaningful smuggling impact, to sit behind or in front of another HTTP intermediary (proxy/load balancer/backend) that parses the chunk-size token differently. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine but moderate-priority issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation No vendor-released patch version is identified in the available data for this CVE - the referenced Red Hat advisory (https://access.redhat.com/security/cve/CVE-2026-93574) and tracking bug (https://bugzilla.redhat.com/show_bug.cgi?id=2536966) should be monitored for the fixed Netty build and the updated product errata for AMQ Broker 7, AMQ Clients, Quarkus, Keycloak/RH-SSO 7, JBoss EAP 7/8, Fuse 7, Data Grid 8, Camel for Spring Boot 4, Camel 4 for Quarkus 3, Apicurio Registry 3 and Debezium 3; until a patched release is available, apply compensating controls. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-93574 vulnerability details – vuln.today

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