{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-121506","assignerOrgId":"ceab7361-8a18-47b1-92ba-4d7d25f6715a","state":"PUBLISHED","assignerShortName":"GitLab","dateReserved":"2026-11-03T14:17:04.662Z","datePublished":"2026-11-03T14:17:24.651Z","dateUpdated":"2026-11-03T15:29:28.236Z"},"containers":{"cna":{"title":"Out-of-bounds Write in NTPsec","descriptions":[{"lang":"en","value":"An out-of-bounds read and write in NTS client extension field parsing (extens_client_recv) in NTPsec before 1.2.5 allows a remote attacker who can send NTP server-mode replies to an NTS client to corrupt heap memory and crash ntpd, and, combined with the NTS-KE client out-of-bounds read fixed in 1.2.4, to bypass NTS authentication and set the client's time, via an NTS Authenticator and Encrypted Extension Fields field whose nonce length exceeds the field."}],"affected":[{"vendor":"NTPsec","product":"NTPsec","repo":"https://gitlab.com/NTPsec/ntpsec","versions":[{"version":"1.1.4","status":"affected","lessThan":"1.2.5","versionType":"semver"}],"defaultStatus":"unaffected"}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-787: Out-of-bounds Write","cweId":"CWE-787","type":"CWE"}]}],"references":[{"url":"https://gitlab.com/NTPsec/ntpsec/-/commit/0a36941e499d533dfbc3fb6b1fcd8c367679d719"},{"url":"https://gitlab.com/NTPsec/ntpsec/-/work_items/902"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":7.4,"baseSeverity":"HIGH"}}],"solutions":[{"lang":"en","value":"Upgrade to version 1.2.5 or above."}],"credits":[{"lang":"en","value":"Found by OSS-Fuzz (issue 393742176); Erica Windisch (Cyberdione Labs) analyzed its impact","type":"finder"}],"providerMetadata":{"orgId":"ceab7361-8a18-47b1-92ba-4d7d25f6715a","shortName":"GitLab","dateUpdated":"2026-11-03T14:17:24.651Z"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-121506","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-11-03T15:15:17.727246Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-11-03T15:29:28.236Z"}}]}}