SB20261112121 - IBM Watson Discovery for IBM Cloud Pak for Data update for Apache Log4j Core

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Main Vulnerability Database SB20261112121

SB20261112121 - IBM Watson Discovery for IBM Cloud Pak for Data update for Apache Log4j Core

Published: November 12, 2026

Security Bulletin ID SB20261112121
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Partial DoS

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-2026-34480)

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

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause log event loss.

The vulnerability exists due to improper output neutralization in XmlLayout when processing log messages or MDC values containing XML 1.0 forbidden characters. A remote attacker can supply crafted input containing forbidden characters to cause log event loss.

The impact depends on the StAX implementation in use: built-in JRE StAX may produce malformed XML that downstream parsers reject, while alternative implementations may throw an exception during the logging call so the event is delivered only to Log4j's internal status logger.


Remediation

Install update from vendor's website.

References