Vulnerability · Published Jun 24, 2026 · Assigned by NCSC.ch
CVE-2026-13006Incomplete protection against CVE-2025-11226
High 7.0
In plain English
A high-severity improper input validation in Logback-core from QOS.CH Sarl. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
ACE vulnerability in conditional configuration file processing by QOS.CH logback-core up to and including version 1.5.36 in Java applications, allows an attacker to execute arbitrary code circumventing existing protections against CVE-2025-11226 by compromising an existing logback configuration file or by injecting an environment variable before program execution. A successful attack requires the presence of Janino library to be present on the user's class path. In addition, the attacker must have write access to a configuration file. Alternatively, the attacker could inject a malicious environment variable pointing to a malicious configuration file. In both cases, the attack requires existing privilege. Please note that in logack version 1.5.37 conditional processing using Janino was removed.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | logback | no fix listed | DEBIAN-CVE-2026-13006 |
| Debian:13 | logback | no fix listed | DEBIAN-CVE-2026-13006 |
| Debian:14 | logback | 1:1.6.3-1 | DEBIAN-CVE-2026-13006 |
| Ubuntu:24.04:LTS | logback | no fix listed | UBUNTU-CVE-2026-13006 |
| Ubuntu:25.10 | logback | no fix listed | UBUNTU-CVE-2026-13006 |
| Ubuntu:26.04:LTS | logback | no fix listed | UBUNTU-CVE-2026-13006 |
| Ubuntu:26.10 | logback | no fix listed | UBUNTU-CVE-2026-13006 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| QOS.CH Sarl | Logback-core | 0.9.20 – through 1.5.36 |
Weakness: CWE-20 · Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N/S:P/AU:N/RE:M/U:Green