SB2026070357 - Fedora EPEL 9 update for log4cxx

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Main Vulnerability Database SB2026070357

SB2026070357 - Fedora EPEL 9 update for log4cxx

Published: July 3, 2026

Security Bulletin ID SB2026070357
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Encoding or Escaping of Output (CVE-ID: CVE-2026-40023)

CWE-ID: CWE-116 - Improper Encoding or Escaping of Output

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to suppress individual log records.

The vulnerability exists due to improper output neutralization in XMLLayout when processing logged data containing XML 1.0 forbidden characters. A remote attacker can inject crafted characters into log messages, NDC, or MDC property keys and values to suppress individual log records.

This can cause downstream log processing systems to reject invalid XML documents and fail to index affected records.


Remediation

Install update from vendor's website.

References