{ "threat_severity" : "Moderate", "public_date" : "2026-04-10T15:36:19Z", "bugzilla" : { "description" : "org.apache.logging.log4j/log4j-core: Apache Log4j Core: Man-in-the-middle attack due to incomplete hostname verification", "id" : "2457319", "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2457319" }, "cvss3" : { "cvss3_base_score" : "6.8", "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N", "status" : "verified" }, "cwe" : "CWE-295", "details" : [ "The fix for CVE-2025-68161 https://logging.apache.org/security.html#CVE-2025-68161 was incomplete: it addressed hostname verification only when enabled via the log4j2.sslVerifyHostName https://logging.apache.org/log4j/2.x/manual/systemproperties.html#log4j2.sslVerifyHostName system property, but not when configured through the verifyHostName https://logging.apache.org/log4j/2.x/manual/appenders/network.html#SslConfiguration-attr-verifyHostName attribute of the element.\nAlthough the verifyHostName configuration attribute was introduced in Log4j Core 2.12.0, it was silently ignored in all versions through 2.25.3, leaving TLS connections vulnerable to interception regardless of the configured value.\nA network-based attacker may be able to perform a man-in-the-middle attack when all of the following conditions are met:\n* An SMTP, Socket, or Syslog appender is in use.\n* TLS is configured via a nested element.\n* The attacker can present a certificate issued by a CA trusted by the appender's configured trust store, or by the default Java trust store if none is configured.\nThis issue does not affect users of the HTTP appender, which uses a separate verifyHostname https://logging.apache.org/log4j/2.x/manual/appenders/network.html#HttpAppender-attr-verifyHostName attribute that was not subject to this bug and verifies host names by default.\nUsers are advised to upgrade to Apache Log4j Core 2.25.4, which corrects this issue.", "A flaw was found in Apache Log4j Core. A network-based attacker can perform a man-in-the-middle (MITM) attack, allowing them to intercept encrypted communications. This occurs when an SMTP, Socket, or Syslog appender uses Transport Layer Security (TLS) with a nested element, and the attacker has a certificate from a trusted Certificate Authority (CA). The vulnerability stems from an incomplete hostname verification fix, making TLS connections susceptible to interception." ], "affected_release" : [ { "product_name" : "Red Hat Offline Knowledge Portal 1.2.4", "release_date" : "2026-05-28T00:00:00Z", "advisory" : "RHSA-2026:21773", "cpe" : "cpe:/a:redhat:offline_knowledge_portal:1.2::el9", "package" : "offline-knowledge-portal/rhokp-rhel9:1779996999" } ], "package_state" : [ { "product_name" : "Red Hat AI Inference Server", "fix_state" : "Fix deferred", "package_name" : "redhat-user-workloads/rhaiis-cuda-ubi9-3-2-2", "cpe" : "cpe:/a:redhat:ai_inference_server:3" }, { "product_name" : "Red Hat AI Inference Server", "fix_state" : "Fix deferred", "package_name" : "redhat-user-workloads/rhaiis-cuda-ubi9-3-3", "cpe" : "cpe:/a:redhat:ai_inference_server:3" }, { "product_name" : "Red Hat AMQ Broker 7", "fix_state" : "Fix deferred", "package_name" : "log4j-core", "cpe" : "cpe:/a:redhat:amq_broker:7" }, { "product_name" : "Red Hat build of Apache Camel for Spring Boot 4", "fix_state" : "Fix deferred", "package_name" : "log4j-core", "cpe" : "cpe:/a:redhat:camel_spring_boot:4" }, { "product_name" : "Red Hat build of Apache Camel - HawtIO 4", "fix_state" : "Fix deferred", "package_name" : "log4j-core", "cpe" : "cpe:/a:redhat:apache_camel_hawtio:4" }, { "product_name" : "Red Hat build of Apicurio Registry 2", "fix_state" : "Fix deferred", "package_name" : "log4j-core", "cpe" : "cpe:/a:redhat:service_registry:2" }, { "product_name" : "Red Hat build of Apicurio Registry 3", "fix_state" : "Fix deferred", "package_name" : "log4j-core", "cpe" : "cpe:/a:redhat:apicurio_registry:3" }, { "product_name" : "Red Hat build of OptaPlanner 8", "fix_state" : "Fix deferred", "package_name" : "log4j-core", "cpe" : "cpe:/a:redhat:optaplanner:::el6" }, { "product_name" : "Red Hat Data Grid 8", "fix_state" : "Fix deferred", "package_name" : "log4j-core", "cpe" : "cpe:/a:redhat:jboss_data_grid:8" }, { "product_name" : "Red Hat Data Grid 8", "fix_state" : "Fix deferred", "package_name" : "log4j-core-test", "cpe" : "cpe:/a:redhat:jboss_data_grid:8" }, { "product_name" : "Red Hat Enterprise Linux 8", "fix_state" : "Fix deferred", "package_name" : "log4j:2/log4j", "cpe" : "cpe:/o:redhat:enterprise_linux:8" }, { "product_name" : "Red Hat Enterprise Linux 8", "fix_state" : "Fix deferred", "package_name" : "pki-core:10.6/resteasy", "cpe" : "cpe:/o:redhat:enterprise_linux:8" }, { "product_name" : "Red Hat Enterprise Linux 8", "fix_state" : "Fix deferred", "package_name" : "pki-deps:10.6/resteasy", "cpe" : "cpe:/o:redhat:enterprise_linux:8" }, { "product_name" : "Red Hat Enterprise Linux 9", "fix_state" : "Fix deferred", "package_name" : "log4j", "cpe" : "cpe:/o:redhat:enterprise_linux:9" }, { "product_name" : "Red Hat Enterprise Linux 9", "fix_state" : "Fix deferred", "package_name" : "resteasy", "cpe" : "cpe:/o:redhat:enterprise_linux:9" }, { "product_name" : "Red Hat Enterprise Linux AI (RHEL AI) 3", "fix_state" : "Fix deferred", "package_name" : "bazel7", "cpe" : "cpe:/a:redhat:enterprise_linux_ai:3" }, { "product_name" : "Red Hat Enterprise Linux AI (RHEL AI) 3", "fix_state" : "Fix deferred", "package_name" : "bazel8", "cpe" : "cpe:/a:redhat:enterprise_linux_ai:3" }, { "product_name" : "Red Hat Enterprise Linux AI (RHEL AI) 3", "fix_state" : "Fix deferred", "package_name" : "redhat-user-workloads/bootc-cuda-aws-3-3", "cpe" : "cpe:/a:redhat:enterprise_linux_ai:3" }, { "product_name" : "Red Hat Enterprise Linux AI (RHEL AI) 3", "fix_state" : "Fix deferred", "package_name" : "redhat-user-workloads/bootc-cuda-azure-3-3", "cpe" : "cpe:/a:redhat:enterprise_linux_ai:3" }, { "product_name" : "Red Hat Enterprise Linux AI (RHEL AI) 3", "fix_state" : "Fix deferred", "package_name" : "redhat-user-workloads/bootc-cuda-gcp-3-3", "cpe" : "cpe:/a:redhat:enterprise_linux_ai:3" }, { "product_name" : "Red Hat Enterprise Linux AI (RHEL AI) 3", "fix_state" : "Fix deferred", "package_name" : "rhelai3/bootc-cuda-rhel9", "cpe" : "cpe:/a:redhat:enterprise_linux_ai:3" }, { "product_name" : "Red Hat Fuse 7", "fix_state" : "Fix deferred", "package_name" : "log4j-core", "cpe" : "cpe:/a:redhat:jboss_fuse:7" }, { "product_name" : "Red Hat JBoss Enterprise Application Platform 7", "fix_state" : "Fix deferred", "package_name" : "log4j-core", "cpe" : "cpe:/a:redhat:jboss_enterprise_application_platform:7" }, { "product_name" : "Red Hat JBoss Enterprise Application Platform 8", "fix_state" : "Fix deferred", "package_name" : "log4j-core", "cpe" : "cpe:/a:redhat:jboss_enterprise_application_platform:8" }, { "product_name" : "Red Hat JBoss Enterprise Application Platform 8", "fix_state" : "Fix deferred", "package_name" : "log4j-core-test", "cpe" : "cpe:/a:redhat:jboss_enterprise_application_platform:8" }, { "product_name" : "Red Hat JBoss Enterprise Application Platform Expansion Pack", "fix_state" : "Fix deferred", "package_name" : "log4j-core", "cpe" : "cpe:/a:redhat:jbosseapxp" }, { "product_name" : "Red Hat JBoss Enterprise Application Platform Expansion Pack", "fix_state" : "Fix deferred", "package_name" : "log4j-core-test", "cpe" : "cpe:/a:redhat:jbosseapxp" }, { "product_name" : "Red Hat JBoss Web Server 6", "fix_state" : "Fix deferred", "package_name" : "log4j-core", "cpe" : "cpe:/a:redhat:jboss_enterprise_web_server:6" }, { "product_name" : "Red Hat Offline Knowledge Portal", "fix_state" : "Fix deferred", "package_name" : "redhat-user-workloads/rhokp-core-encrypted", "cpe" : "cpe:/a:redhat:offline_knowledge_portal:1" }, { "product_name" : "Red Hat OpenShift AI (RHOAI)", "fix_state" : "Fix deferred", "package_name" : "rhoai/odh-modelmesh-rhel8", "cpe" : "cpe:/a:redhat:openshift_ai" }, { "product_name" : "Red Hat OpenShift AI (RHOAI)", "fix_state" : "Fix deferred", "package_name" : "rhoai/odh-modelmesh-rhel9", "cpe" : "cpe:/a:redhat:openshift_ai" }, { "product_name" : "Red Hat OpenShift AI (RHOAI)", "fix_state" : "Fix deferred", "package_name" : "rhoai/odh-pipeline-runtime-datascience-cpu-py312-rhel9", "cpe" : "cpe:/a:redhat:openshift_ai" }, { "product_name" : "Red Hat OpenShift AI (RHOAI)", "fix_state" : "Fix deferred", "package_name" : "rhoai/odh-pipeline-runtime-pytorch-cuda-py312-rhel9", "cpe" : "cpe:/a:redhat:openshift_ai" }, { "product_name" : "Red Hat OpenShift AI (RHOAI)", "fix_state" : "Fix deferred", "package_name" : "rhoai/odh-pipeline-runtime-pytorch-rocm-py312-rhel9", "cpe" : "cpe:/a:redhat:openshift_ai" }, { "product_name" : "Red Hat OpenShift AI (RHOAI)", "fix_state" : "Fix deferred", "package_name" : "rhoai/odh-pipeline-runtime-tensorflow-cuda-py312-rhel9", "cpe" : "cpe:/a:redhat:openshift_ai" }, { "product_name" : "Red Hat OpenShift AI (RHOAI)", "fix_state" : "Fix deferred", "package_name" : "rhoai/odh-pipeline-runtime-tensorflow-rocm-py312-rhel9", "cpe" : "cpe:/a:redhat:openshift_ai" }, { "product_name" : "Red Hat OpenShift AI (RHOAI)", "fix_state" : "Fix deferred", "package_name" : "rhoai/odh-vllm-cuda-rhel9", "cpe" : "cpe:/a:redhat:openshift_ai" }, { "product_name" : "Red Hat OpenShift AI (RHOAI)", "fix_state" : "Fix deferred", "package_name" : "rhoai/odh-vllm-gaudi-rhel9", "cpe" : "cpe:/a:redhat:openshift_ai" }, { "product_name" : "Red Hat OpenShift AI (RHOAI)", "fix_state" : "Fix deferred", "package_name" : "rhoai/odh-workbench-jupyter-datascience-cpu-py312-rhel9", "cpe" : "cpe:/a:redhat:openshift_ai" }, { "product_name" : "Red Hat OpenShift AI (RHOAI)", "fix_state" : "Fix deferred", "package_name" : "rhoai/odh-workbench-jupyter-pytorch-cuda-py312-rhel9", "cpe" : "cpe:/a:redhat:openshift_ai" }, { "product_name" : "Red Hat OpenShift AI (RHOAI)", "fix_state" : "Fix deferred", "package_name" : "rhoai/odh-workbench-jupyter-pytorch-rocm-py312-rhel9", "cpe" : "cpe:/a:redhat:openshift_ai" }, { "product_name" : "Red Hat OpenShift AI (RHOAI)", "fix_state" : "Fix deferred", "package_name" : "rhoai/odh-workbench-jupyter-tensorflow-cuda-py312-rhel9", "cpe" : "cpe:/a:redhat:openshift_ai" }, { "product_name" : "Red Hat OpenShift AI (RHOAI)", "fix_state" : "Fix deferred", "package_name" : "rhoai/odh-workbench-jupyter-tensorflow-rocm-py312-rhel9", "cpe" : "cpe:/a:redhat:openshift_ai" }, { "product_name" : "Red Hat OpenShift AI (RHOAI)", "fix_state" : "Fix deferred", "package_name" : "rhoai/odh-workbench-jupyter-trustyai-cpu-py312-rhel9", "cpe" : "cpe:/a:redhat:openshift_ai" }, { "product_name" : "streams for Apache Kafka 2", "fix_state" : "Fix deferred", "package_name" : "log4j-core", "cpe" : "cpe:/a:redhat:amq_streams:2" }, { "product_name" : "streams for Apache Kafka 3", "fix_state" : "Fix deferred", "package_name" : "log4j-core", "cpe" : "cpe:/a:redhat:amq_streams:3" } ], "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-34477\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34477\nhttps://github.com/apache/logging-log4j2/pull/4075\nhttps://lists.apache.org/thread/lkx8cl46t2bvkcwfcb2pd43ygc097lq4\nhttps://logging.apache.org/cyclonedx/vdr.xml\nhttps://logging.apache.org/log4j/2.x/manual/appenders/network.html#SslConfiguration-attr-verifyHostName\nhttps://logging.apache.org/security.html#CVE-2026-34477" ], "name" : "CVE-2026-34477", "mitigation" : { "value" : "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.", "lang" : "en:us" }, "csaw" : false }