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CVE Record

CVE-2026-50011: Netty has unbounded pre-allocation in RedisArrayAggregator from RESP array length

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, RedisArrayAggregator pre-allocates ArrayList with initial capacity equal to the RESP array element count declared in an array header. That count is taken from the wire before the corresponding child messages exist. A small malicious header can claim a huge initial capacity. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Netty can be forced to allocate excessive memory when handling a Redis protocol array header. An unauthenticated remote sender may cause a denial of service in affected applications that expose this parser. The issue is patched in Netty 4.1.135.Final and 4.2.15.Final.

Executive priority

Prioritize remediation for exposed services that parse Redis/RESP traffic with Netty. This is primarily an availability risk, not a data theft issue, but remote unauthenticated denial of service can still disrupt customer-facing or critical internal systems.

Technical view

RedisArrayAggregator pre-allocates an ArrayList using the RESP array element count declared on the wire before child messages exist. In affected Netty versions, a large declared count can cause unbounded allocation. The CVSS vector indicates network access, low complexity, no privileges, no user interaction, and high availability impact.

Likely exposure

Exposure is most likely in Java applications or products using vulnerable Netty versions and the Redis codec path, especially where Redis/RESP parsing is reachable from untrusted networks. Affected ranges are Netty before 4.1.135.Final and 4.2.0.Final through before 4.2.15.Final.

Exploitation context

The provided bundle does not show CISA KEV listing or active exploitation evidence. The vulnerability is still operationally important because the CVSS vector supports remote unauthenticated denial of service against reachable affected parsing paths.

Researcher notes

Classify as CWE-400 and CWE-770 resource allocation weakness. The key condition is attacker-controlled RESP array length driving pre-allocation before message validation. The bundle confirms patched versions but does not provide detailed patch mechanics; validate through dependency and code-path review rather than exploit reproduction.

Mitigation direction

  • Upgrade Netty to 4.1.135.Final or 4.2.15.Final.
  • Inventory direct and transitive Netty dependencies across Java services.
  • Restrict untrusted network access to Redis/RESP protocol parsing paths.
  • Apply Red Hat errata updates where Red Hat packages are used.
  • Restart affected services after dependency or vendor package updates.

Validation and detection

  • Check SBOMs and dependency trees for io.netty versions.
  • Identify services using Netty Redis codec or RedisArrayAggregator.
  • Confirm runtime artifacts resolve to patched Netty versions.
  • Review vendor advisories for product-specific package status.
  • Monitor affected services for memory exhaustion or unexpected restarts.
Prepared
Confidence
high
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-400: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cwe · low confidence lookup

CWE-770: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-50011 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
2ADP providers
8Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6GitHub_M
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2026-50011Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPnetty-codec-redis: Netty: Denial of Service via malicious Redis array header
other:Red Hat severity ratingcvssV3_1
  • 2026-06-12T16:01:17.003Z: Reported to Red Hat.
  • 2026-06-12T14:52:18.042Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
nettynetty>= 4.2.0.Final, < 4.2.15.Final, < 4.1.135.FinalListed
Weakness

CWE details

CWE-400CWE-770

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.