CVE-2026-93491

A flaw was found in Netty's HttpServerCodec. A remote, unauthenticated attacker can exploit this vulnerability by pipelining HTTP/1.1 requests on a single connection and withholding reads. This action causes the methodOverflowQueue to grow without limit, leading to unbounded heap memory consumption and a denial of service due to memory exhaustion.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:69440
https://access.redhat.com/errata/RHSA-2026:69470
https://access.redhat.com/errata/RHSA-2026:70257
https://access.redhat.com/errata/RHSA-2026:83612
https://access.redhat.com/security/cve/CVE-2026-93491
https://bugzilla.redhat.com/show_bug.cgi?id=2536891
https://github.com/netty/netty/releases/tag/netty-4.1.138.Final
https://github.com/netty/netty/releases/tag/netty-4.2.18.Final

Configurations

No configuration.

History

15 Oct 2026, 17:17

Type	Values Removed	Values Added
References		() https://access.redhat.com/errata/RHSA-2026:83612 -

22 Sep 2026, 19:16

Type	Values Removed	Values Added
References		() https://access.redhat.com/errata/RHSA-2026:69440 - () https://access.redhat.com/errata/RHSA-2026:70257 -

21 Sep 2026, 17:19

Type	Values Removed	Values Added
References		() https://access.redhat.com/errata/RHSA-2026:69470 -

18 Sep 2026, 13:18

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-18 13:18

Updated : 2026-10-15 17:17

NVD link : CVE-2026-93491

Mitre link : CVE-2026-93491

CVE.ORG link : CVE-2026-93491

JSON object : View

Products Affected

No product.

CWE

CWE-770

Allocation of Resources Without Limits or Throttling

{"id": "CVE-2026-93491", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-93491", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-18T19:06:39.794513Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "secalert@redhat.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "secalert@redhat.com", "affectedData": [{"cpes": ["cpe:/a:redhat:apache_camel_quarkus:3.33"], "vendor": "Red Hat", "product": "Red Hat Build of Apache Camel 3.33.3.SP2", "versions": [{"status": "unaffected", "version": "4.1.138.Final-redhat-00001", "lessThan": "*", "versionType": "rpm"}], "packageName": "io.netty/netty-codec-http", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:debezium:3.6"], "vendor": "Red Hat", "product": "Red Hat Build of Debezium 3.6", "packageName": "netty-codec-http", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:quarkus:3.27::el8"], "vendor": "Red Hat", "product": "Red Hat build of Quarkus 3.27.5.SP2", "packageName": "netty-codec-http", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:quarkus:3.33::el8"], "vendor": "Red Hat", "product": "Red Hat build of Quarkus 3.33.3.SP2", "packageName": "netty-codec-http", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:amq_broker:7"], "vendor": "Red Hat", "product": "Red Hat AMQ Broker 7", "packageName": "netty-codec-http", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:amq_clients:2023"], "vendor": "Red Hat", "product": "Red Hat AMQ Clients", "packageName": "netty-codec-http", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:camel_quarkus:3"], "vendor": "Red Hat", "product": "Red Hat build of Apache Camel 4 for Quarkus 3", "packageName": "netty-codec-http", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:camel_spring_boot:4"], "vendor": "Red Hat", "product": "Red Hat build of Apache Camel for Spring Boot 4", "packageName": "netty-codec-http", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:apicurio_registry:3"], "vendor": "Red Hat", "product": "Red Hat build of Apicurio Registry 3", "packageName": "netty-codec-http", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:build_keycloak:"], "vendor": "Red Hat", "product": "Red Hat Build of Keycloak", "packageName": "netty-codec-http", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:jboss_data_grid:8"], "vendor": "Red Hat", "product": "Red Hat Data Grid 8", "packageName": "netty-codec-http", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:jboss_fuse:7"], "vendor": "Red Hat", "product": "Red Hat Fuse 7", "packageName": "netty-codec-http", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unknown"}, {"cpes": ["cpe:/a:redhat:jboss_enterprise_application_platform:7"], "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform 7", "packageName": "netty-codec-http", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "defaultStatus": "unknown"}, {"cpes": ["cpe:/a:redhat:jboss_enterprise_application_platform:8"], "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform 8", "packageName": "netty-codec-http", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:red_hat_single_sign_on:7"], "vendor": "Red Hat", "product": "Red Hat Single Sign-On 7", "packageName": "netty-codec-http", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}]}], "published": "2026-09-18T13:18:38.723", "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:69440", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:69470", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:70257", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:83612", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-93491", "source": "secalert@redhat.com"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2536891", "source": "secalert@redhat.com"}, {"url": "https://github.com/netty/netty/releases/tag/netty-4.1.138.Final", "source": "secalert@redhat.com"}, {"url": "https://github.com/netty/netty/releases/tag/netty-4.2.18.Final", "source": "secalert@redhat.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "secalert@redhat.com", "description": [{"lang": "en", "value": "CWE-770"}]}], "descriptions": [{"lang": "en", "value": "A flaw was found in Netty's HttpServerCodec. A remote, unauthenticated attacker can exploit this vulnerability by pipelining HTTP/1.1 requests on a single connection and withholding reads. This action causes the methodOverflowQueue to grow without limit, leading to unbounded heap memory consumption and a denial of service due to memory exhaustion."}], "lastModified": "2026-10-15T17:17:30.173", "sourceIdentifier": "secalert@redhat.com"}