SB20260528257 - IBM Sterling Connect:Direct for Microsoft Windows update for Bouncy Castle
Published: May 28, 2026
Security Bulletin ID
SB20260528257
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use of a broken or risky cryptographic algorithm (CVE-ID: CVE-2026-5588)
CWE-ID: CWE-327 - Use of a Broken or Risky Cryptographic Algorithm
CVSSv4: 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/E:U/U:Green
The vulnerability allows a remote attacker to bypass signature verification.
The vulnerability exists due to use of a broken or risky cryptographic algorithm in the PKIX draft CompositeVerifier when processing composite signatures. A remote attacker can provide an empty signature sequence to bypass signature verification.
Remediation
Install update from vendor's website.