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 <Ssl> element.
Although 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.
A network-based attacker may be able to perform a man-in-the-middle attack when all of the following conditions are met:
* An SMTP, Socket, or Syslog appender is in use.
* TLS is configured via a nested <Ssl> element.
* 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.
This 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.
Users are advised to upgrade to Apache Log4j Core 2.25.4, which corrects this issue.
References
| Link | Resource |
|---|---|
| https://github.com/apache/logging-log4j2/pull/4075 | Issue Tracking Patch |
| https://lists.apache.org/thread/lkx8cl46t2bvkcwfcb2pd43ygc097lq4 | Mailing List |
| https://logging.apache.org/cyclonedx/vdr.xml | Vendor Advisory |
| https://logging.apache.org/log4j/2.x/manual/appenders/network.html#SslConfiguration-attr-verifyHostName | Product |
| https://logging.apache.org/security.html#CVE-2026-34477 | Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
06 May 2026, 16:49
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/apache/logging-log4j2/pull/4075 - Issue Tracking, Patch | |
| References | () https://lists.apache.org/thread/lkx8cl46t2bvkcwfcb2pd43ygc097lq4 - Mailing List | |
| References | () https://logging.apache.org/cyclonedx/vdr.xml - Vendor Advisory | |
| References | () https://logging.apache.org/log4j/2.x/manual/appenders/network.html#SslConfiguration-attr-verifyHostName - Product | |
| References | () https://logging.apache.org/security.html#CVE-2026-34477 - Vendor Advisory | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.9 |
| CPE | cpe:2.3:a:apache:log4j:3.0.0:alpha1_rc1:*:*:*:*:*:* cpe:2.3:a:apache:log4j:3.0.0:alpha1_rc2:*:*:*:*:*:* cpe:2.3:a:apache:log4j:3.0.0:beta1:*:*:*:*:*:* cpe:2.3:a:apache:log4j:*:*:*:*:*:*:*:* cpe:2.3:a:apache:log4j:3.0.0:alpha1:*:*:*:*:*:* cpe:2.3:a:apache:log4j:3.0.0:beta3:*:*:*:*:*:* cpe:2.3:a:apache:log4j:3.0.0:beta2:*:*:*:*:*:* |
|
| CWE | CWE-295 | |
| First Time |
Apache log4j
Apache |
10 Apr 2026, 16:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-04-10 16:16
Updated : 2026-06-17 10:39
NVD link : CVE-2026-34477
Mitre link : CVE-2026-34477
CVE.ORG link : CVE-2026-34477
JSON object : View
Products Affected
apache
- log4j