SB2026101504 - Multiple vulnerabilities in IBM Fusion, IBM Fusion HCI, and IBM Fusion Data Cataloging
Published: October 15, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Interpretation Conflict (CVE-ID: CVE-2026-13676)
CWE-ID: CWE-436 - Interpretation Conflict
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to modify data on the system.
The vulnerability exists due to fast-uri fail to canonicalize Unicode (IDN) hostnames for HTTP-family URLs. The IDN conversion path calls a helper that does not exist on the global URL constructor, silently leaving the host in its original Unicode form while normalize() and equal() still return values that differ from a WHATWG-compatible URL parser. A remote attacker can trigger the vulnerability to modify data on the system.
2) Interpretation Conflict (CVE-ID: CVE-2026-16221)
CWE-ID: CWE-436 - Interpretation Conflict
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass host-based policy checks and route requests to an unintended destination.
The vulnerability exists due to interpretation conflict in the fast-uri URL parser when parsing URLs containing a literal backslash in the authority section for special schemes. A remote attacker can supply a specially crafted URL to bypass host-based policy checks and route requests to an unintended destination.
This issue can occur when an application validates a URL with fast-uri and then passes the same input to Node's WHATWG URL parser or fetch-related consumers, which extract a different host from the same string.
3) Interpretation Conflict (CVE-ID: CVE-2026-18446)
CWE-ID: CWE-436 - Interpretation Conflict
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass host-based policy checks and steer requests to an unintended destination.
The vulnerability exists due to interpretation conflict in the fast-uri URI parser when parsing references that use backslash-based authority introducers. A remote attacker can supply a specially crafted URL to bypass host-based policy checks and steer requests to an unintended destination.
The issue arises from inconsistent host extraction between fast-uri and Node's WHATWG URL handling for special schemes.
Remediation
Install update from vendor's website.