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CVE Record

CVE-2026-93492: Io.netty/netty-codec-http2: netty: http/2 hpackencoder dos with large table size

A flaw was found in Netty's HTTP/2 HpackEncoder. A remote attacker can exploit this by sending HTTP/2 SETTINGS frames with a very large MAX_HEADER_TABLE_SIZE. This causes the HpackEncoder to store an excessive number of unique headers, leading to increased CPU usage and memory consumption, ultimately resulting in a Denial of Service (DoS).

MediumCVSS 5.3Not KEV-listedUpdated
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Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2026-93492 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.3 (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:L

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
5Source 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
5.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L3.91.4redhat

Vulnerability scoring details

Base CVSS 3.1 score

5.3Medium
CVSS 3.1 vector shape for CVE-2026-93492Attack 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:L

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 Quarkus 3.27.5.SP2netty-codec-http2unaffected
Red HatRed Hat build of Quarkus 3.33.3.SP2netty-codec-http2unaffected
Red HatRed Hat AMQ Broker 7netty-codec-http2unaffected
Red HatRed Hat build of Apache Camel 4 for Quarkus 3netty-codec-http2affected
Red HatRed Hat build of Apache Camel for Spring Boot 4netty-codec-http2affected
Red HatRed Hat build of Apicurio Registry 3netty-codec-http2affected
Red HatRed Hat build of Debezium 3netty-codec-http2affected
Red HatRed Hat Build of Keycloaknetty-codec-http2affected
Red HatRed Hat Data Grid 8netty-codec-http2affected
Red HatRed Hat Fuse 7netty-codec-http2unknown
Red HatRed Hat JBoss Enterprise Application Platform 7netty-codec-http2unknown
Red HatRed Hat JBoss Enterprise Application Platform 8netty-codec-http2affected
Red HatRed Hat Single Sign-On 7netty-codec-http2unknown
Weakness

CWE details

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CWE-1035 · source CWE mapping

OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities

OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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