CVE-2026-34477
medium
CVSS v3
5.9
CVSS v2
—
VIR risk
5.9
Description
Apache Log4j Core: `verifyHostName` attribute silently ignored in TLS configuration
Predictions
Exploit likelihood
69%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2026-34477.html
Vendor advisory: security@apache.org — https://logging.apache.org/security.html#CVE-2026-34477
Vendor advisory: security@apache.org — https://logging.apache.org/cyclonedx/vdr.xml
Vendor advisory: security@apache.org — https://github.com/apache/logging-log4j2/pull/4075
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-34477
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | fixed | 0 |
| debian | bullseye | fixed | 0 |
| debian | forky | fixed | 0 |
| debian | sid | fixed | 0 |
| debian | trixie | fixed | 0 |
| sles | affected | |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Maven | org.apache.logging.log4j:log4j-core | >=2.12.0,<2.25.4 | 2.25.4 |
| Maven | org.apache.logging.log4j:log4j-core | >=3.0.0-alpha1,<=3.0.0-beta3 | |
References
- https://security-tracker.debian.org/tracker/CVE-2026-34477
- https://github.com/apache/logging-log4j2/pull/4075
- https://lists.apache.org/thread/lkx8cl46t2bvkcwfcb2pd43ygc097lq4
- https://logging.apache.org/cyclonedx/vdr.xml
- https://logging.apache.org/log4j/2.x/manual/appenders/network.html#SslConfiguration-attr-verifyHostName
- https://logging.apache.org/security.html#CVE-2026-34477
- https://nvd.nist.gov/vuln/detail/CVE-2026-34477
- https://github.com/apache/logging-log4j2
- https://www.suse.com/security/cve/CVE-2026-34477.html
CWEs
CWE-297 CWE-295
Verify integrity in audit chain (admin only). AS-IS.