CVE catalog

CVE-2026-34477

The fix for CVE-2025-68161…

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.

Severity: Medium · CVSS 6.8CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Published: Apr 10, 2026, 3:36:19 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.56% · Oct 27, 2026

Projects and upstream resources

[apache-log4j2][Project homepage][Source repository][Apache security advisories][Installation and dependencies]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence

Original provider fields

{
  "package_releases": [
    {
      "name": "apache-log4j2",
      "status": "not affected",
      "release": "sid",
      "version": "2.26.1-1"
    },
    {
      "name": "apache-log4j2",
      "status": "not affected",
      "release": "forky",
      "version": "2.19.0-2"
    },
    {
      "name": "apache-log4j2",
      "status": "not affected",
      "release": "trixie",
      "version": "2.19.0-2"
    },
    {
      "name": "apache-log4j2",
      "status": "not affected",
      "release": "bookworm",
      "version": "2.19.0-2"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "apache-log4j2",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "unimportant",
      "fixed_version": "0"
    },
    {
      "bug": null,
      "name": "apache-log4j2",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "unimportant",
      "fixed_version": "0"
    },
    {
      "bug": null,
      "name": "apache-log4j2",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "unimportant",
      "fixed_version": "0"
    },
    {
      "bug": null,
      "name": "apache-log4j2",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "unimportant",
      "fixed_version": "0"
    }
  ],
  "distribution_packages": [
    {
      "name": "log4j",
      "ecosystem": "cpe",
      "fixed_version": "2.25.4"
    },
    {
      "name": "log4j",
      "ecosystem": "cpe",
      "fixed_version": ""
    },
    {
      "name": "log4j",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.20.0-2.1"
            }
          ]
        }
      ],
      "release": "tumbleweed",
      "versions": [],
      "ecosystem": "rpm",
      "fixed_version": "2.20.0-2.1",
      "provider_record_id": "OPENSUSE-SU-2026:10544-1"
    },
    {
      "name": "log4j",
      "ranges": [],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-34477"
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[liblog4j2-java]Unknown
Source package: [apache-log4j2]
Details (2)
- 2.19.0-2 · all · bookworm
  Not affected
  nvd · apache-log4j2 · debian · bookworm
- 2.19.0-2 · all · bookworm
  Not affected
  nvd · apache-log4j2 · debian · bookworm

[openSUSE Tumbleweed]

[log4j]Unknown
Source package: [log4j]
Details (1)
- 2.26.1-2.1 · noarch · tumbleweed
  Fixed · Fixed: 2.20.0-2.1
  nvd · log4j · opensuse · tumbleweed
[log4j-bom]Unknown
Source package: [log4j]
Details (1)
- 2.26.1-2.1 · noarch · tumbleweed
  Unknown · Fixed: 2.20.0-2.1
  Version impact unknown
  nvd · log4j · opensuse · tumbleweed
[log4j-javadoc]Unknown
Source package: [log4j]
Details (1)
- 2.26.1-2.1 · noarch · tumbleweed
  Unknown · Fixed: 2.20.0-2.1
  Version impact unknown
  nvd · log4j · opensuse · tumbleweed
[log4j-jcl]Unknown
Source package: [log4j]
Details (1)
- 2.26.1-2.1 · noarch · tumbleweed
  Unknown · Fixed: 2.20.0-2.1
  Version impact unknown
  nvd · log4j · opensuse · tumbleweed
[log4j-nosql]Unknown
Source package: [log4j]
Details (1)
- 2.26.1-2.1 · noarch · tumbleweed
  Unknown · Fixed: 2.20.0-2.1
  Version impact unknown
  nvd · log4j · opensuse · tumbleweed
[log4j-slf4j]Unknown
Source package: [log4j]
Details (1)
- 2.26.1-2.1 · noarch · tumbleweed
  Unknown · Fixed: 2.20.0-2.1
  Version impact unknown
  nvd · log4j · opensuse · tumbleweed
[log4j-taglib]Unknown
Source package: [log4j]
Details (1)
- 2.26.1-2.1 · noarch · tumbleweed
  Unknown · Fixed: 2.20.0-2.1
  Version impact unknown
  nvd · log4j · opensuse · tumbleweed
[log4j-web]Unknown
Source package: [log4j]
Details (1)
- 2.26.1-2.1 · noarch · tumbleweed
  Unknown · Fixed: 2.20.0-2.1
  Version impact unknown
  nvd · log4j · opensuse · tumbleweed

Observed: Oct 26, 2026, 10:27:07 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]