{"id":"CVE-2026-101276","state":"PUBLISHED","title":"iperf3 3.21 (esnet/iperf) contains a remote, unauthenticated heap use-after-free: the server's per-test watchdog server_timer_proc() frees streams without cancelling/joining their ","description":"iperf3 3.21 (esnet/iperf) contains a remote, unauthenticated heap use-after-free: the server's per-test watchdog server_timer_proc() frees streams without cancelling/joining their worker threads, so a blocked worker dereferences a freed iperf_stream; fixed in 3.22.","publishedAt":"2026-09-30T21:11:52.046Z","updatedAt":"2026-10-01T15:51:00.728Z","severity":{"score":9.2,"label":"Critical","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","source":"Anthropic"},"assigner":"Anthropic","products":["esnet iperf3"],"affected":[{"vendor":"esnet","product":"iperf3","defaultStatus":"unaffected","versions":[{"version":"3.21","status":"affected"}]}],"references":["https://newreleases.io/project/github/esnet/iperf/release/3.22"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:10:13.529Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/101xxx/CVE-2026-101276.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-101276","state":"PUBLISHED","datePublished":"2026-09-30T21:11:52.046Z","dateUpdated":"2026-10-01T15:51:00.728Z","assignerShortName":"Anthropic","assignerOrgId":"98a01053-8a31-4f6d-9aa9-252be161adc6","dateReserved":"2026-09-28T11:52:18.066Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"iperf3 3.21 (esnet/iperf) contains a remote, unauthenticated heap use-after-free: the server's per-test watchdog server_timer_proc() frees streams without cancelling/joining their worker threads, so a blocked worker dereferences a freed iperf_stream; fixed in 3.22."}],"affected":[{"vendor":"esnet","product":"iperf3","defaultStatus":"unaffected","versions":[{"version":"3.21","status":"affected"}]}],"references":[{"url":"https://newreleases.io/project/github/esnet/iperf/release/3.22","tags":["release-notes"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"CRITICAL","baseScore":9.2,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","lang":"en","description":"CWE-416 Use after free","type":"CWE"}]}],"providerMetadata":{"shortName":"Anthropic","orgId":"98a01053-8a31-4f6d-9aa9-252be161adc6","dateUpdated":"2026-09-30T21:13:21.540Z"},"impacts":[{"capecId":"CAPEC-456","descriptions":[{"lang":"en","value":"CAPEC-456 Infected Memory"}]}],"credits":[{"lang":"en","value":"Anthropic","type":"finder"},{"lang":"en","value":"Ada Logics","type":"reporter"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-01T15:50:45.814450Z","id":"CVE-2026-101276","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-01T15:51:00.728Z"}}]}}}