GHSA-6hg6-v5c8-fphq

Suggest an improvement
Source
https://github.com/advisories/GHSA-6hg6-v5c8-fphq
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-6hg6-v5c8-fphq/GHSA-6hg6-v5c8-fphq.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-6hg6-v5c8-fphq
Aliases
  • CVE-2026-34477
Downstream
Related
Published
2026-04-10T18:31:17Z
Modified
2026-04-17T12:29:10.521430176Z
Severity
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:L/SA:N CVSS Calculator
Summary
Apache Log4j Core: `verifyHostName` attribute silently ignored in TLS configuration
Details

The fix for CVE-2025-68161 was incomplete: it addressed hostname verification only when enabled via the log4j2.sslVerifyHostName system property, but not when configured through the 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 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.

Database specific 
{
    "github_reviewed": true,
    "nvd_published_at": "2026-04-10T16:16:30Z",
    "cwe_ids": [
        "CWE-297"
    ],
    "github_reviewed_at": "2026-04-14T00:11:55Z",
    "severity": "MODERATE"
}
References

Affected packages

Maven / org.apache.logging.log4j:log4j-core

Package

Name
org.apache.logging.log4j:log4j-core
View open source insights on deps.dev
Purl
pkg:maven/org.apache.logging.log4j/log4j-core

Affected ranges

Type
ECOSYSTEM
Events
Introduced
2.12.0
Fixed
2.25.4

Affected versions

2.*
2.12.0
2.12.1
2.12.2
2.12.3
2.12.4
2.13.0
2.13.1
2.13.2
2.13.3
2.14.0
2.14.1
2.15.0
2.16.0
2.17.0
2.17.1
2.17.2
2.18.0
2.19.0
2.20.0
2.21.0
2.21.1
2.22.0
2.22.1
2.23.0
2.23.1
2.24.0
2.24.1
2.24.2
2.24.3
2.25.0
2.25.1
2.25.2
2.25.3

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-6hg6-v5c8-fphq/GHSA-6hg6-v5c8-fphq.json"

Maven / org.apache.logging.log4j:log4j-core

Package

Name
org.apache.logging.log4j:log4j-core
View open source insights on deps.dev
Purl
pkg:maven/org.apache.logging.log4j/log4j-core

Affected ranges

Type
ECOSYSTEM
Events
Introduced
3.0.0-alpha1
Last affected
3.0.0-beta3

Affected versions

3.*
3.0.0-alpha1
3.0.0-beta1
3.0.0-beta2
3.0.0-beta3

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-6hg6-v5c8-fphq/GHSA-6hg6-v5c8-fphq.json"