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Netty Memcache Codec CVE-2026-93561

| EUVDEUVD-2026-82864 MEDIUM
OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities (CWE-1035)
2026-09-18 redhat GHSA-7p33-hhxj-4qcr
Java Information Disclosure Red Hat Fuse 7 Red Hat Single Sign On 7 Red Hat Build Of Apache Camel For Spring Boot 4 Red Hat Jboss Enterprise Application Platform 7 Red Hat
6.5
CVSS 3.1 · Vendor: redhat
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Severity by source

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

Network-reachable unauthenticated codec flaw; response smuggling yields limited cross-client confidentiality and integrity impact (C:L/I:L), no availability effect, scope unchanged within the same component.

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

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

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

Lifecycle Timeline

4
Metadata Corrected
Sep 18, 2026 - 14:40 vuln.today
tag: Java added
Analysis Generated
Sep 18, 2026 - 14:37 vuln.today
CVE Published
Sep 18, 2026 - 10:02 cve.org
UNKNOWN (no severity yet)
CVE Published
Sep 18, 2026 - 10:02 nvd
MEDIUM 6.5

DescriptionCVE.org

Memcache binary codec signed/unsigned type mismatch causes frame desynchronization and response smuggling

AnalysisAI

A signed/unsigned type mismatch in Netty's Memcache binary protocol codec desynchronizes frame boundaries, allowing an unauthenticated, network-positioned attacker to smuggle responses across a shared or proxied memcache connection (CVSS 3.1 base 6.5, Medium). The flaw is reachable only when the Memcache binary codec is explicitly wired into a network-exposed Netty pipeline - a non-default configuration - and the affected code ships inside Red Hat Fuse 7, JBoss Enterprise Application Platform 7, Single Sign-On 7, and the Red Hat Build of Apache Camel for Spring Boot 4. …

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Vulnerability AssessmentAI

Exploitation Exploitation requires the target Java application to use Netty's Memcache binary protocol codec to decode traffic that an attacker can influence, and a topology where response smuggling is meaningful (e.g., a shared/proxied or multiplexed connection carrying multiple clients' memcache traffic). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N (base 6.5, Medium) describes an unauthenticated, network-reachable, low-complexity flaw in Netty's Memcache binary codec where a signed/unsigned type mismatch desynchronizes frame boundaries, enabling response smuggling with limited confidentiality and integrity impact (C:L/I:L) and no availability impact. … 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 Patch status is not confirmed from the available data; there is no exact fixed Netty or Red Hat product version in the supplied references, so operators should monitor https://access.redhat.com/security/cve/CVE-2026-93561 and https://bugzilla.redhat.com/show_bug.cgi?id=2536949 for the vendor-issued errata and upgrade to the corrected Netty build (or the Red Hat product update that ships it) as soon as it is published. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-93561 vulnerability details – vuln.today
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