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As of 10/10/2026, ngtcp2 recorded 0 security vulnerabilities in the last 90 days, of which 0 are rated High or Critical. None of these vulnerabilities is actively exploited (KEV) according to CISA's catalog. CyStack recommends that organizations and individual users apply patches as soon as possible.
CyStack does not yet have sufficient official-source data to identify the latest version of ngtcp2 and determine which vulnerabilities affect that version.
CyStack VulnScan continuously discovers assets, validates vulnerabilities, and helps security teams prioritize remediation across the organization.
CVE-2026-40170ngtcp2 has a qlog transport parameter serialization stack buffer overflowCVE-2024-52811Acks not validated before logged to qlog leads to buffer overflow in ngtcp2| Vulnerability | Exploitation status | Fix | Published | Severity |
|---|---|---|---|---|
CVE-2026-40170ngtcp2 has a qlog transport parameter serialization stack buffer overflow | Exploitation statusActively exploited | FixYes | Published04/16/2026 | SeverityHigh |
CVE-2024-52811Acks not validated before logged to qlog leads to buffer overflow in ngtcp2 | Exploitation statusNot exploited | FixNo | Published11/25/2024 | SeverityHigh |
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