Medium [CVE-2026-27820] Memory corruption via buffer overflow in Zlib::GzipReader
This medium-severity Red Hat Linux advisory covers CVE-2026-27820 affecting ruby4, ruby3, Red Hat Enterprise Linux.
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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 products named by the advisory: Red Hat Enterprise Linux.
- 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 2 months ago·verify at source
- RHSA-2026:7307
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- 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 2 months ago·verify at source
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