{"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"}}]}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "NTPsec", "repo": "https://gitlab.com/NTPsec/ntpsec", "vendor": "NTPsec", "versions": [{"lessThan": "1.2.5", "status": "affected", "version": "1.1.4", "versionType": "semver"}]}], "source": "cve@gitlab.com"}], "cveTags": [], "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."}], "id": "CVE-2026-121506", "lastModified": "2026-11-03T15:17:37.717", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.2, "source": "cve@gitlab.com", "type": "Secondary"}]}, "published": "2026-11-03T15:17:37.717", "references": [{"source": "cve@gitlab.com", "url": "https://gitlab.com/NTPsec/ntpsec/-/commit/0a36941e499d533dfbc3fb6b1fcd8c367679d719"}, {"source": "cve@gitlab.com", "url": "https://gitlab.com/NTPsec/ntpsec/-/work_items/902"}], "sourceIdentifier": "cve@gitlab.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "cve@gitlab.com", "type": "Primary"}]}

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