CVE-2026-54784

CoreWCF is a port of the service side of Windows Communication Foundation WCF to .NET Core. In version 1.9.0, CoreWCF SPNEGO SecurityContextToken negotiation can expose the proof key recovered from the RSTR when TransportWithMessageCredential with Windows client credentials and session...

CVE-2026-54776

CoreWCF is a port of the service side of Windows Communication Foundation WCF to .NET Core. Prior to 1.8.1 and 1.9.1, a CoreWCF service hosted on Unix Domain Sockets with PosixIdentity client credentials can accept connections that skip the application/unixposix stream upgrade before dispatching...

CVE-2026-54781

CoreWCF is a port of the service side of Windows Communication Foundation WCF to .NET Core. Prior to 1.8.1 and 1.9.1, CoreWCF SAML token validation does not enforce SubjectConfirmation method URIs or holder-of-key proof keys in SamlSecurityTokenHandler, allowing holder-of-key downgrade or custom...

CVE-2026-54784

CoreWCF CVE-2026-54784 affects CoreWCF 1.9.0 where SPNEGO SecurityContextToken proof key recovered from the RSTR can be observed when using TransportWithMessageCredential with Windows client credentials, enabling impersonation of the Windows principal and decryption/forgery of WS‑SecureConversati...

CVE-2026-54777

CoreWCF is a port of the service side of Windows Communication Foundation WCF to .NET Core. Prior to 1.8.1 and 1.9.1, CoreWCF NetNamedPipe transport accepts attachment to a pre-existing named pipe instance, allowing local interception of NetNamedPipe traffic when an attacker races NamedPipeListen...

CVE-2026-54774 CoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not an X.509 certificate

CoreWCF is a port of the service side of Windows Communication Foundation WCF to .NET Core. Prior to 1.8.1 and 1.9.1, SamlSerializer skips final SignatureValue verification when a CoreWCF service validates SAML tokens using a non-X.509 signing token, allowing an attacker to reference a non-X.509...

CVE-2026-54775

Summary: CVE-2026-54775 affects CoreWCF.Kafka’s KafkaTransportPump. Before versions 1.8.1 and 1.9.1, a null-value tombstone (Kafka tombstone) on a topic causes the pump to halt, stopping processing of new records and potentially causing persistent endpoint denial of service for topics with produc...

CVE-2026-54773

CoreWCF WS-Security signature substitution vulnerability: prior to versions 1.8.1 and 1.9.1, WS-Security verification performs a document-wide ds:Signature lookup, allowing an unauthenticated remote attacker to place a SOAP header before wsse:Security and cause attacker-supplied ds:Signature to b...

CVE-2026-54772

CoreWCF (net.tcp/net.pipe/net.uds) prior to versions 1.8.1 and 1.9.1 is affected. An unauthenticated remote attacker can trigger premature EOF handling in the framing handshake, causing one server thread-pool worker to be pinned at 100% CPU per connection and potentially exhausting CPU with multi...

CVE-2026-54776 CoreWCF: Unix Domain Socket PosixIdentity transport accepts connections that skip the security upgrade

CoreWCF is a port of the service side of Windows Communication Foundation WCF to .NET Core. Prior to 1.8.1 and 1.9.1, a CoreWCF service hosted on Unix Domain Sockets with PosixIdentity client credentials can accept connections that skip the application/unixposix stream upgrade before dispatching...

CoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not an X.509 certificate

Impact When a service is configured to validate SAML tokens using a method other than X.509 certificate signing, the final signature verification is skipped. Preconditions The service is configured to authenticate using SAML tokens and an out of band token resolver commonly the IssuerTokenResolve...

GHSA-P86G-XRR2-PF7C CoreWCF: Pre-authentication infinite-loop CPU exhaustion in CoreWCF net.tcp / net.pipe / net.uds framing handshake

Impact An unauthenticated remote attacker can pin one server thread‑pool worker at 100 % CPU per connection. With a few connections, the CPU usage can be exhausted. Preconditions An attacker being able to reach a service which is exposing an endpoint using one of NetTcpBinding, NetNamedPipeBindin...

PT-2026-51076

Name of the Vulnerable Software and Affected Versions CoreWCF versions prior to 1.8.1 CoreWCF versions prior to 1.9.1 Description SAML token replay protection is inoperative because the DefaultTokenReplayCache.TryAdd function does not reject duplicate tokens when DetectReplayedTokens is enabled...