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CVE Record

CVE-2026-93488: Io.netty/netty-codec-http: netty: denial of service via unbounded concurrent spdy streams

A flaw was found in Netty. SpdySessionHandler accepts an unlimited number of concurrent remote-initiated streams because localConcurrentStreams defaults to Integer.MAX_VALUE and the handler provides no API to change it. A remote peer can open a SPDY connection and send a large number of SYN_STREAM frames with FLAG_FIN=0, causing unbounded heap and direct memory allocation that can lead to JVM OutOfMemoryError and a denial of service.

HighCVSS 7.5Not KEV-listedUpdated
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Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2026-93488 mapping review

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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.

1CVSS vectors
5Timeline events
1ADP providers
8Source links

SSVC decision data

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

CVSS vector scores

1 official score

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:H3.93.6redhat

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2026-93488Attack 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. Source timelineredhat

    Reported to Red Hat.

  2. Source timelineredhat

    Made public.

  3. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  4. CVE publishedCVE Program

    The CVE record was published.

  5. CVE updatedCVE Program

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

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Red HatRed Hat Build of Apache Camel 3.33.3.SP2io.netty/netty-codec-http, 4.1.138.Final-redhat-00001affected
Red HatRed Hat build of Quarkus 3.27.5.SP2netty-codec-httpunaffected
Red HatRed Hat build of Quarkus 3.33.3.SP2netty-codec-httpunaffected
Red HatRed Hat AMQ Broker 7netty-codec-httpaffected
Red HatRed Hat AMQ Clientsnetty-codec-httpaffected
Red HatRed Hat build of Apache Camel 4 for Quarkus 3netty-codec-httpaffected
Red HatRed Hat build of Apache Camel for Spring Boot 4netty-codec-httpaffected
Red HatRed Hat build of Apicurio Registry 3netty-codec-httpaffected
Red HatRed Hat build of Debezium 3netty-codec-httpaffected
Red HatRed Hat Build of Keycloaknetty-codec-httpaffected
Red HatRed Hat Data Grid 8netty-codec-httpaffected
Red HatRed Hat Fuse 7netty-codec-httpunknown
Red HatRed Hat JBoss Enterprise Application Platform 7netty-codec-httpunknown
Red HatRed Hat JBoss Enterprise Application Platform 8netty-codec-httpaffected
Red HatRed Hat Single Sign-On 7netty-codec-httpaffected
Weakness

CWE details

CWE-770

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CWE-770 · source CWE mapping

Allocation of Resources Without Limits or Throttling

Allocation of Resources Without Limits or Throttling represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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