SB2026052624 - Multiple vulnerabilities in IBM App Connect Enterprise

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Main Vulnerability Database SB2026052624

SB2026052624 - Multiple vulnerabilities in IBM App Connect Enterprise

Published: May 26, 2026

Security Bulletin ID SB2026052624
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 67% Low 33%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 vulnerabilities.


1) Input validation error (CVE-ID: CVE-2026-27942)

CWE-ID: CWE-20 - Improper input validation

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


The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to improper input validation in arrToStr in XMLBuilder when processing input with preserveOrder enabled. A remote user can supply specially crafted input to cause a denial of service.

Only applications using the XML builder with preserveOrder set to true are vulnerable.


2) XML Entity Expansion (CVE-ID: CVE-2026-33036)

CWE-ID: CWE-776 - Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

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


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper restriction of entity expansion in replaceEntitiesValue() in src/xmlparser/OrderedObjParser.js when parsing XML input containing numeric character references or standard XML entities. A remote attacker can send specially crafted XML input with massive numbers of numeric entity references to cause a denial of service.

The configured entity expansion limits are enforced only for DOCTYPE-defined entities, while numeric character references and standard XML entities are processed through a separate code path without expansion counting.


3) Improper Validation of Specified Quantity in Input (CVE-ID: CVE-2026-33349)

CWE-ID: CWE-1284 - Improper Validation of Specified Quantity in Input

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


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper validation of specified quantity in input in DocTypeReader when parsing XML input with entity processing limits set to 0. A remote attacker can supply a specially crafted XML document with many large entity definitions to cause a denial of service.

Only applications that explicitly set maxEntityCount or maxEntitySize to 0 are affected. The default configuration is not affected, and configurations with entity processing disabled are not affected.


Remediation

Install update from vendor's website.

References