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Netty CVE-2026-48006

| EUVDEUVD-2026-36492 HIGH
Memory Leak (CWE-401)
2026-06-11 https://github.com/netty/netty GHSA-6jv9-x5w9-2ccm
Redis Information Disclosure
8.7
CVSS 4.0 · Vendor: https://github.com/netty/netty
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Severity by source

Vendor (https://github.com/netty/netty) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.5 HIGH

Remote unauthenticated Redis-protocol connection churn against a vulnerable Netty pipeline exhausts the shared direct-memory pool, causing process-wide availability loss with no confidentiality or integrity impact.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (https://github.com/netty/netty).

CVSS VectorVendor: https://github.com/netty/netty

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

6
Analysis Updated
Jun 12, 2026 - 16:31 vuln.today
v3 (cvss_changed)
Analysis Updated
Jun 12, 2026 - 16:31 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jun 12, 2026 - 16:22 vuln.today
cvss_changed
CVSS changed
Jun 12, 2026 - 16:22 NVD
8.7 (HIGH)
Source Code Evidence Fetched
Jun 11, 2026 - 13:52 vuln.today
Analysis Generated
Jun 11, 2026 - 13:52 vuln.today

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 76 maven packages depend on io.netty:netty-codec-redis (4 direct, 72 indirect)

Ecosystem-wide dependent count for version 4.2.0.Final.

DescriptionCVE.org

Impact

The RedisArrayAggregator handler permanently leaks pooled direct-memory buffers when a Redis pipeline connection closes before a RESP array aggregate completes. The handler retains child messages in per-handler state (depths field) but defines no channelInactive, handlerRemoved, or exceptionCaught method to release them when the pipeline tears down. Because the leaked buffers are slices of PooledByteBufAllocator chunks, they prevent those chunks from being returned to the JVM-wide direct-memory pool. Repeated connection churn by any network peer monotonically drains this shared pool, eventually causing allocation failures on all Netty channels in the process.

AnalysisAI

Memory exhaustion in Netty's RedisArrayAggregator handler (io.netty:netty-codec-redis) allows remote unauthenticated attackers to drain the JVM-wide direct-memory pool by repeatedly opening and closing Redis pipeline connections before RESP array aggregates complete. Affects netty-codec-redis 4.1.x through 4.1.134.Final and 4.2.0.Final through 4.2.14.Final; vendor patches are available in 4.1.135.Final and 4.2.15.Final. No public exploit identified at time of analysis, EPSS is low (0.04%), and the issue is not in CISA KEV.

Technical ContextAI

Netty is a widely used asynchronous Java network framework, and netty-codec-redis provides RESP (REdis Serialization Protocol) codecs. The RedisArrayAggregator is a ChannelHandler that assembles streamed child RESP messages into complete aggregate replies, storing in-flight state in a per-handler 'depths' field that retains references to child messages backed by PooledByteBuf slices. The defect is a textbook CWE-401 (Missing Release of Memory after Effective Lifetime): the handler implements no channelInactive, handlerRemoved, or exceptionCaught callbacks to release retained buffers when the pipeline tears down mid-aggregation. Because PooledByteBufAllocator hands out slices of larger pre-allocated chunks, even a small retained slice pins an entire chunk in the JVM-wide direct-memory pool, preventing reuse across all Netty channels in the process.

RemediationAI

Vendor-released patch: upgrade io.netty:netty-codec-redis to 4.2.15.Final on the 4.2.x branch or 4.1.135.Final on the 4.1.x branch, per the Netty advisory at https://github.com/netty/netty/security/advisories/GHSA-6jv9-x5w9-2ccm. Verify transitive dependencies with mvn dependency:tree or gradle dependencies and pin the codec version, since the 4.1.135.Final release also bundles fixes for several other high-severity Netty CVEs (CVE-2026-50011, CVE-2026-44250, CVE-2026-44890 in the same Redis codec) that share the same upgrade path. As a compensating control where immediate patching is not possible, remove RedisArrayAggregator from pipelines that terminate connections from untrusted peers (accepting that aggregate RESP replies will no longer be assembled by Netty and must be handled by application code), or restrict Redis-protocol exposure to trusted networks via firewall or mTLS so connection churn cannot be driven by arbitrary peers; both reduce attack surface but do not fix the leak when a trusted peer legitimately disconnects mid-aggregate.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

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CVE-2026-48006 vulnerability details – vuln.today
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