CVE-2026-34480
unknown
CVSS v3
—
CVSS v2
—
VIR risk
—
Description
Apache Log4j Core: Silent log event loss in XmlLayout due to unescaped XML 1.0 forbidden characters
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2026-34480.html
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-34480
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | affected | |
| debian | bullseye | affected | |
| debian | forky | affected | |
| debian | sid | affected | |
| debian | trixie | affected | |
| sles | affected | |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Maven | org.apache.logging.log4j:log4j-core | >=2.0-alpha1,<2.25.4 | 2.25.4 |
| Maven | org.apache.logging.log4j:log4j-core | >=3.0.0-alpha1,<=3.0.0-beta3 | |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| gcp | | |
References
- https://security-tracker.debian.org/tracker/CVE-2026-34480
- https://nvd.nist.gov/vuln/detail/CVE-2026-34480
- https://github.com/apache/logging-log4j2/pull/4077
- https://github.com/apache/logging-log4j2
- https://lists.apache.org/thread/5x0hcnng0chhghp6jgjdp3qmbbhfjzhb
- https://logging.apache.org/cyclonedx/vdr.xml
- https://logging.apache.org/log4j/2.x/manual/layouts.html#XmlLayout
- https://logging.apache.org/security.html#CVE-2026-34480
- http://www.openwall.com/lists/oss-security/2026/04/10/9
- https://www.suse.com/security/cve/CVE-2026-34480.html
Verify integrity in audit chain (admin only). AS-IS.