Medium5.6Red Hat & Ubuntu Linux
Memory corruption via buffer overflow in Zlib::GzipReader
CVE-2026-27820 Published Apr 16, 2026
CVE-2026-27820
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
Memory corruption via buffer overflow in Zlib::GzipReader. Red Hat rates this moderate (CVSS 5.6). Weakness: CWE-131. Affected package(s): ruby4, ruby3. Resolved in Red Hat advisory RHSA-2026:7307 — update the affected packages (`sudo dnf update`).
Affected versions
- ruby4-0-main-4.0.0-33.3.hum1
- ruby3-4-main-3.4.8-31.1.hum1
- ruby3-3-main-3.3.10-23.1.hum1
Official advisory · high-confidence parse· fetched 4 hours ago·verify at source
Fixed versions
- RHSA-2026:7307
Official advisory · high-confidence parse· fetched 4 hours ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- Update the affected package(s) to the fixed version shipped in RHSA-2026:7307 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 4 hours ago·verify at source
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