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CVE-2026-34477 is a TLS hostname-verification vulnerability in Apache Log4j Core resulting from an incomplete fix for CVE-2025-68161. The verifyHostName attribute of the nested <Ssl> configuration element, introduced in version 2.12.0, was silently ignored through version 2.25.3. The earlier fix addressed verification enabled through the log4j2.sslVerifyHostName system property but not through this attribute. Affected SMTP, Socket, and Syslog appenders can consequently establish TLS connections without the requested hostname verification, potentially enabling man-in-the-middle interception by an attacker presenting a certificate issued by a trusted certificate authority. The HTTP appender is unaffected because it uses a separate hostname-verification attribute and verifies hostnames by default. Version 2.25.4 corrects the issue.
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A TLS hostname-verification vulnerability in Apache Log4j Core caused by an incomplete fix for CVE-2025-68161. Versions 2.12.0 through 2.25.3 ignore the verifyHostName attribute on the nested <Ssl> element. A network attacker presenting a certificate issued by a trusted CA could intercept TLS connections used by SMTP, Socket, or Syslog appenders. The HTTP appender is unaffected. The advisory rates the vulnerability Medium, with CVSS v3 5.9 and CVSS v4 6.3. Upgrading to version 2.25.4 or later corrects the issue.
Third-party component vulnerability listed in Dell advisory DSA-2026-393; the affected component and technical impact are not specified.
Third-party component vulnerability listed in Dell's advisory; the content does not provide its component mapping or technical details.
A CVSS 5.9 security-misconfiguration vulnerability associated with Apache Log4j usage in SAP Commerce Cloud Search and Navigation.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.