TI-2026-33288 Aliases CVE-2026-45536 GHSA-w573-9ffj-6ff9

Netty: Unix-socket fd receive leaks descriptors when peer sends two at once

LOW 18CWE-200Published 2026-06-12 · Updated 2026-06-12

Key facts

Attack vector: Local
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Information disclosure, Denial of service
Confidentiality · integrity · availability: None · None · Low
Fix status: Partial Red Hat: 19 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-200 and CWE-772.

Summary

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, netty_unix_socket_recvFd sets msg_control to `char control[CMSG_SPACE(sizeof(int))]` (line 940) — 24 bytes on 64-bit Linux. A peer-sent SCM_RIGHTS cmsg carrying two ints has cmsg_len = CMSG_LEN(8) = 24, which fits exactly with no MSG_CTRUNC, so the kernel installs both fds in the receiving process. The subsequent check `cmsg->cmsg_len == CMSG_LEN(sizeof(int))` (line 972, expected 20) fails, the branch that would read the fd is skipped, and neither installed fd is closed. The for(;;) loop calls recvmsg again (non-blocking → EAGAIN → Java maps to 0 → read loop exits normally), leaving two leaked fds per message. There is no MSG_CTRUNC handling. Reachable via Epoll/KQueue DomainSocketChannel when the application opts into DomainSocketReadMode.FILE_DESCRIPTORS (non-default). Versions 4.1.135.Final and 4.2.15.Final patch the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00136 3rd percentileScored 2026-11-07

Fix Partial netty (netty): 4.2.15.Final, 4.1.135.Finalio.netty:netty-transport-native-epoll (Maven): 4.2.15.Final, 4.1.135.Final+1 more productRed Hat: 19 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
netty	netty	4.2.0.Final to before 4.2.15.Final; before 4.1.135.Final	4.2.15.Final, 4.1.135.Final	Patch available	CNA
—	io.netty:netty-transport-native-epoll (Maven)	4.2.0.Final to before 4.2.15.Final	4.2.15.Final	Patch available	GHSA-w573-9ffj-6ff9
—	io.netty:netty-transport-native-kqueue (Maven)	4.2.0.Final to before 4.2.15.Final	4.2.15.Final	Patch available	GHSA-w573-9ffj-6ff9
—	io.netty:netty-transport-native-kqueue (Maven)	before 4.1.135.Final	4.1.135.Final	Patch available	GHSA-w573-9ffj-6ff9
—	io.netty:netty-transport-native-epoll (Maven)	before 4.1.135.Final	4.1.135.Final	Patch available	GHSA-w573-9ffj-6ff9

netty Vendornetty Affected 4.2.0.Final to before 4.2.15.Final; before 4.1.135.Final Fixed in 4.2.15.Final, 4.1.135.Final Patch available CNA
io.netty:netty-transport-native-epoll (Maven) Vendor— Affected 4.2.0.Final to before 4.2.15.Final Fixed in 4.2.15.Final Patch available GHSA-w573-9ffj-6ff9
io.netty:netty-transport-native-kqueue (Maven) Vendor— Affected 4.2.0.Final to before 4.2.15.Final Fixed in 4.2.15.Final Patch available GHSA-w573-9ffj-6ff9
io.netty:netty-transport-native-kqueue (Maven) Vendor— Affected before 4.1.135.Final Fixed in 4.1.135.Final Patch available GHSA-w573-9ffj-6ff9
io.netty:netty-transport-native-epoll (Maven) Vendor— Affected before 4.1.135.Final Fixed in 4.1.135.Final Patch available GHSA-w573-9ffj-6ff9

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:netty:netty::::::::	before 4.1.135; 4.2.0 to before 4.2.15	Vulnerable	netty

cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* Versions before 4.1.135; 4.2.0 to before 4.2.15 Vulnerable ·netty

Remediation

Fix · CNA netty (netty) Fixed in 4.2.15.Final, 4.1.135.Final
Fix · GHSA-w573-9ffj-6ff9 io.netty:netty-transport-native-epoll (Maven) Fixed in 4.2.15.Final Advisory →
Fix · GHSA-w573-9ffj-6ff9 io.netty:netty-transport-native-kqueue (Maven) Fixed in 4.2.15.Final Advisory →
Fix · GHSA-w573-9ffj-6ff9 io.netty:netty-transport-native-kqueue (Maven) Fixed in 4.1.135.Final Advisory →
Fix · GHSA-w573-9ffj-6ff9 io.netty:netty-transport-native-epoll (Maven) Fixed in 4.1.135.Final Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Cryostat 4	Affected	No fix yet: Fix deferred
Red Hat AMQ Broker 7	Affected	No fix yet: Fix deferred
Red Hat AMQ Clients	Affected	No fix yet: Fix deferred
Red Hat Build of Keycloak	Affected	No fix yet: Fix deferred
Red Hat Data Grid 8	Affected	No fix yet: Fix deferred
Red Hat Fuse 7	Affected	No fix yet: Fix deferred
Red Hat JBoss Enterprise Application Platform 7	Affected	No fix yet: Fix deferred
Red Hat JBoss Enterprise Application Platform 8	Affected	No fix yet: Fix deferred
Red Hat JBoss Enterprise Application Platform Expansion Pack	Affected	No fix yet: Fix deferred
Red Hat Offline Knowledge Portal	Affected	No fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)	Affected	No fix yet: Fix deferred
Red Hat OpenShift Dev Spaces	Affected	No fix yet: Fix deferred
Red Hat Single Sign-On 7	Affected	No fix yet: Fix deferred
Red Hat build of Apache Camel - HawtIO 4	Affected	No fix yet: Fix deferred
Red Hat build of Apache Camel 4 for Quarkus 3	Affected	No fix yet: Fix deferred
Red Hat build of Apache Camel for Spring Boot 4	Affected	No fix yet: Fix deferred
Red Hat build of Debezium 3	Affected	No fix yet: Fix deferred
streams for Apache Kafka 2	Affected	No fix yet: Fix deferred
streams for Apache Kafka 3	Affected	No fix yet: Fix deferred

Not affected: 2 products

Red Hat Enterprise Linux AI (RHEL AI) 3
Red Hat Satellite 6

Timeline

2026-10-02 Threatist record created from CVE-2026-45536
2026-10-03 Alias added: GHSA-w573-9ffj-6ff9

References

Advisory 2

Other 3

TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
TI-2026-30861 Netty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization CVSS 3.1CRITICAL 9.8
TI-2026-30864 Netty: HttpClientCodec response desynchronization CVSS 3.1CRITICAL 9.1
TI-2026-30859 Netty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder) CVSS 3.1CRITICAL 9.1
TI-2026-40973 Netty: Missing CertificateID Validation in OCSP Response Allows Replay Attacks CVSS 3.1CRITICAL 9.1
TI-2026-40972 Uncontrolled resource consumption in netty CVSS 3.1HIGH 7.5

See all 92 →

Sources

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