CVE-2026-93579

Io.netty/netty-codec-http2: netty: http/2 header field values are not validated by default (cr/lf/nul passthrough)

A flaw was found in Netty's HTTP/2 stack. This vulnerability allows a remote attacker to inject prohibited characters, such as NUL, Line Feed, and Carriage Return, into HTTP/2 header field values due to insufficient validation. When these values cross an HTTP/2 to HTTP/1.1 translation boundary, they can be exploited for request smuggling, header injection, or response splitting. This could lead to unauthorized access, data manipulation, or other security bypasses.

CVSS 3.1 · 6.5 Medium EPSS 1.1% KEV · Not listed

Vendors

Io.netty Redhat

Products

Netty-codec-http2 Amq Broker Apicurio Registry and 20 more

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).

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed

Vendors

Io.netty Redhat

Products

Netty-codec-http2 Amq Broker Amq Broker 7 and 21 more

CVE-2026-93574

Io.netty/netty-codec-http: netty: http request smuggling via post-digit whitespace in chunk-size parsing

A flaw was found in Netty's `netty-codec-http` component. A remote attacker could exploit this vulnerability by sending a specially crafted HTTP/1.1 chunk-size token that includes post-digit whitespace. This incorrect parsing of the chunk size can lead to HTTP request smuggling. This allows an attacker to bypass security controls or access unauthorized resources in proxy/backend deployments.

CVSS 3.1 · 6.5 Medium EPSS 1.7% KEV · Not listed

Vendors

Io.netty Redhat

Products

Netty-codec-http Amq Broker Amq Clients and 19 more

CVE-2026-93573

Io.netty/netty-codec-http: netty split transfer-encoding fields bypass final-chunked validation and enable request smuggling

A flaw was found in Netty's HTTP/1.1 decoder. This vulnerability allows a remote attacker to bypass `Transfer-Encoding` header validation by splitting the `Transfer-Encoding` field across multiple headers, with the last field containing a non-final transfer coding like `gzip` or `deflate`. This bypass can lead to HTTP request smuggling, enabling attackers to bypass security controls, desynchronize request processing, or cause requests to be processed in an unintended context.

CVSS 3.1 · 6.5 Medium EPSS 1.1% KEV · Not listed

Vendors

Io.netty Redhat

Products

Netty-codec-http Amq Broker Amq Clients and 19 more

CVE-2026-93566

Io.netty/netty-codec-http: netty: http request smuggling due to control characters in the chunk-size line

A flaw was found in Netty. A remote attacker could exploit this by sending a specially crafted HTTP request that includes control characters within the chunk-size line. This bypasses the intended strict validation, allowing the attacker to inject arbitrary HTTP requests. This vulnerability can lead to HTTP request smuggling, potentially resulting in information disclosure or other unauthorized actions.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Red Hat Redhat

Products

Red Hat Amq Broker 7 Amq Broker Amq Clients and 19 more

CVE-2026-93562

Io.netty/netty-codec-http: netty: incomplete validation of malformed transfer-encoding allows http request smuggling

A flaw was found in Netty's HTTP/1 decoder. Incomplete validation of malformed Transfer-Encoding headers allows a remote attacker to perform HTTP request smuggling. By sending specially crafted HTTP requests, an attacker can inject arbitrary HTTP requests, potentially bypassing security controls or accessing unauthorized resources.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Io.netty Redhat

Products

Netty-codec-http Amq Broker Amq Clients and 19 more

CVE-2026-19611

Wildfly-elytron: org.wildfly.security/wildfly-elytron-password-impl: wildfly-elytron: password keyspace reduction via nfkc fullwidth folding

A flaw was found in WildFly Elytron. Password hashing and verification normalize input with Unicode NFKC, which can collapse fullwidth characters to ASCII equivalents. A remote attacker can more easily guess affected passwords by using an ASCII-only dictionary against accounts whose passwords were intended to include those non-ASCII characters, leading to unauthorized access.

CVSS 3.1 · 7.4 High EPSS 1.0% KEV · Not listed

Vendors

Redhat

Products

Apache Camel Quarkus Build Keycloak Build Of Apache Camel For Quarkus and 12 more

CVE-2026-93569

Io.netty/netty-codec-http2: http/1 absolute-form host mismatch is translated to http/2 :authority, overriding the request-target authority

A flaw was found in Netty. A remote unauthenticated attacker can exploit a vulnerability in Netty's HTTP/1 to HTTP/2 conversion process. When an HTTP/1 request includes both an absolute-form request-target and a conflicting Host header, Netty incorrectly prioritizes the Host header for the HTTP/2 :authority field, discarding the original request-target authority. This inconsistency can allow an attacker to bypass security controls in Netty-based proxies or gateways, potentially leading to unauthorized access, cache poisoning, or misrouting of requests.

CVSS 3.1 · 8.2 High EPSS 2.4% KEV · Not listed

Vendors

Io.netty Redhat

Products

Netty-codec-http Amq Broker Apache Camel Quarkus and 20 more

CVE-2026-93568

Io.netty/netty-codec-http2: io.netty/netty-codec-http3: netty: http/2 and http/3 extended connect requests are downgraded as regular connect requests

A flaw was found in Netty. A remote attacker could exploit this vulnerability by sending specially crafted HTTP/2 or HTTP/3 Extended CONNECT requests. Netty's HTTP-object conversion path incorrectly processes these requests as regular HTTP/1.1 CONNECT requests, leading to a loss of critical protocol and path information. This misinterpretation can allow attackers to bypass security policies, such as routing or authorization logic, in applications that rely on Netty for HTTP/2 or HTTP/3 communication, resulting in integrity loss.

CVSS 3.1 · 7.5 High EPSS 1.1% KEV · Not listed

Vendors

Io.netty Redhat

Products

Netty-codec-http Amq Broker Apache Camel Quarkus and 21 more

CVE-2026-93567

Io.netty/netty-codec-http2: http/1 authority-form connect is translated to malformed http/2 connect with host-controlled :authority

A flaw was found in Netty's HTTP/2 codec. When converting HTTP/1 CONNECT requests to HTTP/2, the component incorrectly uses the Host header instead of the CONNECT authority-form request-target for the tunnel authority. A remote attacker can exploit this by supplying a different Host header, leading to a malformed HTTP/2 CONNECT request. This can bypass security controls such as tunnel allow-lists or egress policies, resulting in integrity loss.

CVSS 3.1 · 7.5 High EPSS 2.9% KEV · Not listed

Vendors

Io.netty Redhat

Products

Netty-codec-http2 Amq Broker Apache Camel Quarkus and 21 more

CVE-2026-93565

Io.netty/netty-codec-http: netty rtspdecoder method-token smuggling via trailing control byte

A flaw was found in Netty RtspDecoder. The `RtspMethods.valueOf()` function incorrectly strips trailing control bytes from method tokens in Real-Time Streaming Protocol (RTSP) requests. A remote attacker can exploit this by sending a specially crafted RTSP request, leading to method-token smuggling. This vulnerability allows an attacker to bypass method-based access controls and can also be used to launder malicious requests through Netty-based RTSP proxies, making them appear legitimate to backend systems.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Red Hat Redhat

Products

Red Hat Amq Broker 7 Amq Broker Amq Clients and 20 more

CVE-2026-93558

Io.netty/netty-codec-http: netty: unbounded per-connection queue growth in websocketserverextensionhandler leads to denial of service

A flaw was found in Netty's WebSocketServerExtensionHandler. A remote, unauthenticated attacker can exploit this vulnerability by using HTTP/1.1 pipelining to send requests faster than the application can respond. This leads to an unbounded growth of a per-connection queue, consuming excessive memory. Eventually, this can cause the Java Virtual Machine (JVM) to exhaust its heap, resulting in a Denial of Service (DoS) for the affected server.

CVSS 3.1 · 7.5 High EPSS 1.2% KEV · Not listed

Vendors

Io.netty Redhat

Products

Netty-codec-http Amq Broker Amq Broker 7 and 21 more

CVE-2026-93491

Io.netty/netty-codec-http: netty: denial of service via unbounded httpservercodec http/1.1 pipeline queue

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 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Io.netty Redhat

Products

Netty-codec-http Amq Broker Amq Broker 7 and 20 more

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.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Io.netty Redhat

Products

Netty-codec-http Amq Broker Amq Clients and 20 more

CVE-2026-14180

Undertow-core: undertow:http request smuggling via oversized chunk-size bit overlap

A flaw was found in the ChunkReader component of the Undertow HTTP server, which is used by WildFly and JBoss EAP to handle chunked transfer encoding. The issue occurs because the parser uses a single internal variable to store both the remaining chunk size and state flags. By sending a specially crafted request with an extremely large chunk size, an attacker can cause these values to overlap, tricking the parser into thinking a request has finished prematurely. This can allow a second, "smuggled" request to be processed out of sync, potentially bypassing security controls.

CVSS 3.1 · 5.3 Medium EPSS 1.0% KEV · Not listed

Vendors

Redhat

Products

Apache Camel Hawtio Build Of Apache Camel - Hawtio Build Of Apache Camel For Spring Boot and 11 more

CVE-2026-10832

Org.wildfly.security/wildfly-elytron-asn1: unbounded memory allocation in wildfly elytron asn.1 derdecoder via crafted der payload

A flaw was found in the DERDecoder class within wildfly-elytron-asn1. A remote attacker can exploit this resource exhaustion vulnerability by sending a specially crafted DER (Distinguished Encoding Rules) payload. The decoder attempts to allocate excessive memory based on an inflated length value without proper validation, leading to Java Virtual Machine (JVM) memory exhaustion. This results in a remote Denial of Service (DoS) for services that process untrusted DER/ASN.1 input, including SASL (Simple Authentication and Security Layer) authentication mechanisms and X.500 certificate principal parsing paths.

CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Apache Camel Hawtio Build Keycloak Build Of Apache Camel - Hawtio and 20 more

CVE-2026-5680

Undertow-core: undertow: denial of service via websocket permessage-deflate processing

A flaw was found in Undertow. A remote attacker could exploit this vulnerability by sending specially crafted WebSocket messages with permessage-deflate negotiated. This could lead to excessive memory consumption due to the PerMessageDeflateFunction.largerBuffer() method using exponential doubling, resulting in a Denial of Service (DoS) for the affected application.

CVSS 3.1 · 7.5 High EPSS 1.1% KEV · Not listed

Vendors

Redhat Undertow

Products

Apache Camel Hawtio Build Of Apache Camel - Hawtio Build Of Apache Camel For Spring Boot and 14 more

CVE-2026-15565

Undertow: undertow-websockets: undertow: pre-auth dos on websocket endpoint with @serverendpoint class with any @onmessage method

A flaw was found in Undertow. A remote attacker can cause Out of Memory on websockets endpoint without authentication on any @ServerEndpoint class that has any @OnMessage method. This allows an attacker to cause Denial of Service attack without authentication and using only a standard WebSocket handshake.

CVSS 3.1 · 7.5 High EPSS 1.0% KEV · Not listed

Vendors

Redhat

Products

Build Of Apache Camel For Spring Boot Camel Spring Boot Data Grid 8 and 10 more

CVE-2026-17526

Keycloak-services: keycloak-services: privilege escalation via impersonation role allows takeover of realm administrator accounts

Keycloak is an open-source identity and access management solution. A vulnerability was discovered where a user with the impersonation role can impersonate a realm administrator. This allows the attacker to gain full administrative control over the realm, including the ability to manage users, clients, and roles.

CVSS 3.1 · 7.2 High EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid 8 and 4 more

CVE-2026-18573

Keycloak-services: keycloak-services: client access-type policy condition bypass during client update

A flaw was found in the keycloak-services component of Keycloak, which is used for managing authentication and authorization flows. The issue occurs when a realm administrator configures client policies to enforce specific authentication requirements on confidential clients. Due to improper evaluation of the client state during an update operation, an attacker with client management permissions can bypass these security policies by first creating a public client and then updating it to a confidential client with weaker authentication. This can result in the persistence of clients that do not comply with the intended security hardening of the realm.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid 8 and 5 more