{"id":"CVE-2026-71218","summary":"Iperf3: unbounded peer-controlled allocation in iperf3 json_read() allows unauthenticated remote memory exhaustion","details":"A flaw was found in iperf3. A remote unauthenticated attacker can exploit a vulnerability in the `JSON_read()` function, which accepts a peer-controlled message length and allocates memory without an upper bound. This allows the attacker to trigger excessive memory consumption, leading to a Denial of Service (DoS) through memory exhaustion, severe slowdown, or termination of the iperf3 service.","modified":"2026-08-13T08:06:41.059405Z","published":"2026-08-11T08:51:24.805Z","database_specific":{"cna_assigner":"redhat","cwe_ids":["CWE-789"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71218.json"},"references":[{"type":"WEB","url":"https://access.redhat.com/downloads/content/package-browser/"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-71218"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71218.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71218"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2463003"},{"type":"FIX","url":"https://github.com/esnet/iperf/commit/0128d0357b7e8916fe39e980e455729bc0e5fd4e"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/esnet/iperf","events":[{"introduced":"0"},{"fixed":"0128d0357b7e8916fe39e980e455729bc0e5fd4e"}],"database_specific":{"source":"REFERENCES"}}],"versions":["3.17.1","3.16","3.16-beta1","3.15","3.14","3.13","3.12","3.11","3.10.1","3.10","3.9","3.8.1","3.8","3.7","3.6","3.5","3.4","3.3","3.2","3.2rc1","3.1","3.1b3","3.1b2","3.1b1","3.0.4","3.0.1","3.0-BETA5","3.0-BETA4","3.0-BETA3","3.0-BETA2","3.0-BETA1","iperf3","3.0-ALPHA1","iperf-3.0a1","trunk","2.0.4-RELEASE","2.0.3-RELEASE","2.0.2-RELEASE","2.0.1-RELEASE","2.0-RELEASE"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-71218.json","vanir_signatures_modified":"2026-08-13T08:06:41Z","vanir_signatures":[{"id":"CVE-2026-71218-71e1a0f1","signature_type":"Line","signature_version":"v1","source":"https://github.com/esnet/iperf/commit/0128d0357b7e8916fe39e980e455729bc0e5fd4e","target":{"file":"src/iperf_api.c"},"deprecated":false,"digest":{"line_hashes":["304270774645485955517266248989205549676","283325794397299007201438548004275922011","202655944338123134059443406346973678838","28143696863415599732192840274117969379","262599662267697990946627437144199552407"],"threshold":0.9}},{"deprecated":false,"digest":{"function_hash":"171469153698128760994736031743764477921","length":632},"id":"CVE-2026-71218-77dbe087","signature_type":"Function","signature_version":"v1","source":"https://github.com/esnet/iperf/commit/0128d0357b7e8916fe39e980e455729bc0e5fd4e","target":{"function":"JSON_read","file":"src/iperf_api.c"}}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}