Medium6.5Red Hat & Ubuntu Linux
Net::IMAP: Denial of Service via large iteration count in SCRAM authentication
CVE-2026-42256 Published May 9, 2026
CVE-2026-42256
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
Net::IMAP: Denial of Service via large iteration count in SCRAM authentication. Red Hat rates this moderate (CVSS 6.5). Weakness: CWE-606. Affected package(s): ruby3, ruby4. Resolved in Red Hat advisory RHSA-2026:33552 — update the affected packages (`sudo dnf update`).
Affected versions
- ruby3-4-main-3.4.8-31.2.hum1
- ruby4-0-main-4.0.0-33.4.hum1
- ruby3-3-main-3.3.10-23.2.hum1
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
- RHSA-2026:33552
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- Update the affected package(s) to the fixed version shipped in RHSA-2026:33552 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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