High7.5Red Hat & Ubuntu Linux
Denial of service via stack buffer overflow during QUIC handshake
CVE-2026-40170 Published Apr 16, 2026
CVE-2026-40170
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
Denial of service via stack buffer overflow during QUIC handshake. Red Hat rates this important (CVSS 7.5). Weakness: CWE-120. Affected package(s): samba, ngtcp2-main. Resolved in Red Hat advisory RHSA-2026:22963 — update the affected packages (`sudo dnf update`).
Affected versions
- samba-0:4.23.5-109.el10_2
- samba-0:4.23.5-10.el9_8
- ngtcp2-main-1.22.1-1.hum1
Official advisory · high-confidence parse· fetched 6 hours ago·verify at source
Fixed versions
- RHSA-2026:22963
Official advisory · high-confidence parse· fetched 6 hours ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- Update the affected package(s) to the fixed version shipped in RHSA-2026:22963 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 6 hours ago·verify at source
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