Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
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.
Primary rating from Vendor (redhat).
CVSS VectorNVD
Lifecycle Timeline
3DescriptionNVD
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
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. |
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-83385
GHSA-c9wq-39xx-437p