{"id":"USN-8300-1","summary":"ngtcp2 vulnerability","details":"Zou Dikai discovered that ngtcp2 serialized peer transport parameters into\na fixed 1024-byte stack buffer without bounds checking. When qlog was\nenabled, a remote attacker could possibly use this issue to execute\narbitrary code.","modified":"2026-05-26T07:44:33.683102730Z","published":"2026-05-25T10:58:24Z","related":["UBUNTU-CVE-2026-40170"],"upstream":["CVE-2026-40170","UBUNTU-CVE-2026-40170"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8300-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-40170"}],"affected":[{"package":{"name":"ngtcp2","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/ngtcp2?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.1.0+dfsg-1ubuntu0.1~esm1"}]}],"versions":["0~20210905-1","0.1.0+dfsg-1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_version":"0.1.0+dfsg-1ubuntu0.1~esm1","binary_name":"libngtcp2-0"},{"binary_version":"0.1.0+dfsg-1ubuntu0.1~esm1","binary_name":"libngtcp2-crypto-gnutls0"},{"binary_version":"0.1.0+dfsg-1ubuntu0.1~esm1","binary_name":"ngtcp2-client"},{"binary_version":"0.1.0+dfsg-1ubuntu0.1~esm1","binary_name":"ngtcp2-server"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:22.04:LTS","cves":[{"id":"CVE-2026-40170","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8300-1.json"}},{"package":{"name":"ngtcp2","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/ngtcp2?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.12.1+dfsg-1+deb12u1build0.24.04.1"}]}],"versions":["0.12.1+dfsg-1","0.12.1+dfsg-1build1","0.12.1+dfsg-1build2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"0.12.1+dfsg-1+deb12u1build0.24.04.1","binary_name":"libngtcp2-9"},{"binary_version":"0.12.1+dfsg-1+deb12u1build0.24.04.1","binary_name":"libngtcp2-crypto-gnutls2"},{"binary_version":"0.12.1+dfsg-1+deb12u1build0.24.04.1","binary_name":"ngtcp2-client"},{"binary_version":"0.12.1+dfsg-1+deb12u1build0.24.04.1","binary_name":"ngtcp2-server"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:24.04:LTS","cves":[{"id":"CVE-2026-40170","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8300-1.json"}},{"package":{"name":"ngtcp2","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/ngtcp2?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11.0-1+deb13u1build0.25.10.1"}]}],"versions":["1.11.0-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1.11.0-1+deb13u1build0.25.10.1","binary_name":"libngtcp2-16"},{"binary_version":"1.11.0-1+deb13u1build0.25.10.1","binary_name":"libngtcp2-crypto-gnutls8"},{"binary_version":"1.11.0-1+deb13u1build0.25.10.1","binary_name":"ngtcp2-client"},{"binary_version":"1.11.0-1+deb13u1build0.25.10.1","binary_name":"ngtcp2-server"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:25.10","cves":[{"id":"CVE-2026-40170","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8300-1.json"}},{"package":{"name":"ngtcp2","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/ngtcp2?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.16.0-1ubuntu0.1"}]}],"versions":["1.11.0-1","1.16.0-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1.16.0-1ubuntu0.1","binary_name":"libngtcp2-16"},{"binary_version":"1.16.0-1ubuntu0.1","binary_name":"libngtcp2-crypto-gnutls8"},{"binary_version":"1.16.0-1ubuntu0.1","binary_name":"libngtcp2-crypto-ossl0"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:26.04:LTS","cves":[{"id":"CVE-2026-40170","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8300-1.json"}}],"schema_version":"1.7.5"}