{"id":"CVE-2026-39457","state":"PUBLISHED","title":"Stack overflow via select() file descriptor set overflow","description":"When exchanging data over a socket, libnv uses select(2) to wait for data to arrive.  However, it does not verify whether the provided socket descriptor fits in select(2)'s file descriptor set size limit of FD_SETSIZE (1024).\n\nAn attacker who is able to force a libnv application to allocate large file descriptors, e.g., by opening many descriptors and executing a program which is not careful to close them upon startup, can trigger stack corruption.  If the target application is setuid-root, then this could be used to elevate local privileges.","publishedAt":"2026-04-30T08:01:49.015Z","updatedAt":"2026-05-01T03:55:51.194Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"freebsd","products":["FreeBSD FreeBSD"],"affected":[{"vendor":"FreeBSD","product":"FreeBSD","defaultStatus":"unknown","versions":[{"version":"15.0-RELEASE","status":"affected","lessThan":"p7","versionType":"release"},{"version":"14.4-RELEASE","status":"affected","lessThan":"p3","versionType":"release"},{"version":"14.3-RELEASE","status":"affected","lessThan":"p12","versionType":"release"},{"version":"13.5-RELEASE","status":"affected","lessThan":"p13","versionType":"release"}],"modules":["libnv"]}],"references":["https://security.freebsd.org/advisories/FreeBSD-SA-26:16.libnv.asc"],"weaknesses":["CWE-121"],"ingestedAt":"2026-10-29T20:11:50.837Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/39xxx/CVE-2026-39457.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-39457","state":"PUBLISHED","datePublished":"2026-04-30T08:01:49.015Z","dateUpdated":"2026-05-01T03:55:51.194Z","assignerShortName":"freebsd","assignerOrgId":"63664ac6-956c-4cba-a5d0-f46076e16109","dateReserved":"2026-04-28T15:08:10.626Z"},"containers":{"cna":{"title":"Stack overflow via select() file descriptor set overflow","descriptions":[{"lang":"en","value":"When exchanging data over a socket, libnv uses select(2) to wait for data to arrive.  However, it does not verify whether the provided socket descriptor fits in select(2)'s file descriptor set size limit of FD_SETSIZE (1024).\n\nAn attacker who is able to force a libnv application to allocate large file descriptors, e.g., by opening many descriptors and executing a program which is not careful to close them upon startup, can trigger stack corruption.  If the target application is setuid-root, then this could be used to elevate local privileges."}],"affected":[{"vendor":"FreeBSD","product":"FreeBSD","defaultStatus":"unknown","versions":[{"version":"15.0-RELEASE","status":"affected","lessThan":"p7","versionType":"release"},{"version":"14.4-RELEASE","status":"affected","lessThan":"p3","versionType":"release"},{"version":"14.3-RELEASE","status":"affected","lessThan":"p12","versionType":"release"},{"version":"13.5-RELEASE","status":"affected","lessThan":"p13","versionType":"release"}],"modules":["libnv"]}],"references":[{"url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:16.libnv.asc","tags":["vendor-advisory"]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-121","description":"CWE-121: Stack-based Buffer Overflow","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"freebsd","orgId":"63664ac6-956c-4cba-a5d0-f46076e16109","dateUpdated":"2026-04-30T08:01:49.015Z"},"datePublic":"2026-04-29T19:00:00.000Z","credits":[{"lang":"en","type":"finder","value":"Joshua Rogers of AISLE Research Team"}],"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.8,"attackVector":"LOCAL","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-04-30T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-39457"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-01T03:55:51.194Z"}}]}}}