UnratedRed Hat & Ubuntu Linux
ngtcp2 vulnerability
USN-8300-1 Published May 25, 2026
CVE-2026-40170
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
Zou Dikai discovered that ngtcp2 serialized peer transport parameters into a fixed 1024-byte stack buffer without bounds checking. When qlog was enabled, a remote attacker could possibly use this issue to execute arbitrary code. Affected Ubuntu releases: 26.04, 25.10, 24.04, 22.04. CVEs: CVE-2026-40170.
Affected versions
- Ubuntu 26.04
- Ubuntu 25.10
- Ubuntu 24.04
- Ubuntu 22.04
Official advisory · medium-confidence parse· fetched 3 hours ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- Apply available updates: `sudo apt update && sudo apt upgrade` (a standard system update installs the fix).
Official advisory · medium-confidence parse· fetched 3 hours ago·verify at source
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