UBUNTU-CVE-2026-5503

In TLSXEchChangeSNI, the ctx-extensions branch set extensions unconditionally even when TLSXFind returned NULL. This caused TLSXUseSNI to attach the attacker-controlled publicName to the shared WOLFSSLCTX when no inner SNI was configured. TLSXEchRestoreSNI then failed to clean it up because its...

CVE-2026-5503 out-of-bounds write in TLSX_EchChangeSNI via attacker-controlled publicName

In TLSXEchChangeSNI, the ctx-extensions branch set extensions unconditionally even when TLSXFind returned NULL. This caused TLSXUseSNI to attach the attacker-controlled publicName to the shared WOLFSSLCTX when no inner SNI was configured. TLSXEchRestoreSNI then failed to clean it up because its...

CVE-2026-5503 out-of-bounds write in TLSX_EchChangeSNI via attacker-controlled publicName

In TLSXEchChangeSNI, the ctx-extensions branch set extensions unconditionally even when TLSXFind returned NULL. This caused TLSXUseSNI to attach the attacker-controlled publicName to the shared WOLFSSLCTX when no inner SNI was configured. TLSXEchRestoreSNI then failed to clean it up because its...

CVE-2026-5503 out-of-bounds write in TLSX_EchChangeSNI via attacker-controlled publicName

In TLSXEchChangeSNI, the ctx-extensions branch set extensions unconditionally even when TLSXFind returned NULL. This caused TLSXUseSNI to attach the attacker-controlled publicName to the shared WOLFSSLCTX when no inner SNI was configured. TLSXEchRestoreSNI then failed to clean it up because its...

CVE-2026-5503

CVE-2026-5503 affects wolfSSL’s TLSX_EchChangeSNI: the code path sets ctx->extensions unconditionally even when TLSX_Find returns NULL, causing an attacker-controlled publicName to be bound to the shared WOLFSSL_CTX when no inner SNI is configured. TLSX_EchRestoreSNI cannot clean it up because...

tomcat: Client certificate verification bypass due to virtual host mapping

A certificate validation flaw has been found in Apache Tomcat. omcat did not validate that the host name provided via the SNI extension was the same as the host name provided in the HTTP host header field. If Tomcat was configured with more than one virtual host and the TLS configuration for one ...

Amazon Linux 2023 : tomcat9, tomcat9-admin-webapps, tomcat9-el-3.0-api (ALAS2023-2026-1496)

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1496 advisory. mproper Input Validation vulnerability. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.14, from 10.1.0-M1 through 10.1.49, from 9.0.0-M1 through 9.0.112. The following versions...

CLSA-2026-1774460133 Fix CVE(s): CVE-2025-66614

SECURITY UPDATE: client certificate authentication bypass through mismatched SNI and HTTP Host header - debian/patches/CVE-2025-66614.patch: Add strictSNI connector attribute and implement SNI/protocol host name matching for NIO, NIO2, and APR connectors; prevent requests being served by mismatch...

Fixed in Apache Tomcat 10.1.53

Moderate: The fix forCVE-2025-66614 was incomplete CVE-2026-32990 The validation of SNI name and host name did not take account of possible differences in case allowing the strict SNI checks to be bypassed. This was fixed with commit 4d0615a5. This issue was reported to the Tomcat security team o...

SUSE CVE-2026-32305

Traefik is an HTTP reverse proxy and load balancer. Versions 2.11.40 and below, 3.0.0-beta1 through 3.6.11, and 3.7.0-ea.1 are vulnerable to mTLS bypass through the TLS SNI pre-sniffing logic related to fragmented ClientHello packets. When a TLS ClientHello is fragmented across multiple records,...

Traefik has a Potential mTLS Bypass via Fragmented TLS ClientHello Causing Pre-SNI Sniff Fallback to Default Non-mTLS TLS Config

Summary There is a potential vulnerability in Traefik's TLS SNI pre-sniffing logic related to fragmented ClientHello packets. When a TLS ClientHello is fragmented across multiple records, Traefik's SNI extraction may fail with an EOF and return an empty SNI. The TCP router then falls back to the...

Insecure Default Initialization of Resource

Overview Affected versions of this package are vulnerable to Insecure Default Initialization of Resource in the SNI extraction when handling fragmented TLS ClientHello packets. An attacker can gain unauthorized access to services protected by mutual TLS by sending a fragmented ClientHello, causin...

Insecure Default Initialization of Resource

Overview github.com/traefik/traefik/v2/pkg/server/router/tcp is a modern HTTP reverse proxy and load balancer that makes deploying microservices easy. Traefik integrates with your existing infrastructure components Docker, Swarm mode, Kubernetes, Marathon, Consul, Etcd, Rancher, Amazon ECS, ... a...

OESA-2026-1651 tomcat security update

Tomcat is the servlet container that is used in the official Reference Implementation for the Java Servlet and JavaServer Pages technologies. The Java Servlet and JavaServer Pages specifications are developed by Sun under the Java Community Process. Security Fixes: Improper Input Validation...

PT-2026-26601

Name of the Vulnerable Software and Affected Versions Traefik versions 2.11.40 and below Traefik versions 3.0.0-beta1 through 3.6.11 Traefik version 3.7.0-ea.1 Description Traefik, an HTTP reverse proxy and load balancer, is susceptible to a mutual TLS mTLS bypass. This occurs due to a flaw in th...

Fixed in Apache Tomcat 11.0.20

Moderate: The fix forCVE-2025-66614 was incomplete CVE-2026-32990 The validation of SNI name and host name did not take account of possible differences in case allowing the strict SNI checks to be bypassed. This was fixed with commit 021d1f83. This issue was reported to the Tomcat security team o...

Important: tomcat

Issue Overview: mproper Input Validation vulnerability. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.14, from 10.1.0-M1 through 10.1.49, from 9.0.0-M1 through 9.0.112. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through...

Amazon Linux 2 : tomcat, --advisory ALAS2TOMCAT9-2026-024 (ALASTOMCAT9-2026-024)

The version of tomcat installed on the remote host is prior to 9.0.115-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2TOMCAT9-2026-024 advisory. mproper Input Validation vulnerability. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.14, from...

CLSA-2026-1773772035 Fix CVE(s): CVE-2025-23048

SECURITY UPDATE: SNI validation issue in modssl - debian/patches/CVE-2025-23048.patch: update SNI validation to move the SSL compatibility check after strict SNI hostname verification in modules/ssl/sslenginekernel.c. - CVE-2025-23048...

TLS 1.3 SNI Scanner

A command-line PHP vulnerability testing tool was developed to analyze TLS behavior through observation and logical reasoning, rather than relying on fixed rules or CVE numbers. The tool establishes multiple TLS connections to the same server and port using different SNI values. It then compares...