{"id":"CVE-2026-10143","aliases":["GHSA-2jcm-hq8r-84wx","PYSEC-2026-2191"],"url":"https://o3.security/vulnerability/CVE-2026-10143","summary":"kafka-python prior to 2.3.2 DoS via SCRAM Iteration Count in scram.py","details":"kafka-python prior to 2.3.2 contains a denial-of-service vulnerability in SCRAM authentication handling that allows a malicious or machine-in-the-middle broker to freeze the client event loop by supplying an excessively large iteration count. In scram.py, ScramClient.process_server_first_message() passes the broker-controlled SCRAM iteration count directly to hashlib.pbkdf2_hmac() without validation, blocking producer sends, consumer polls, admin operations, and heartbeats, which can cause consumer group eviction and repeated reconnect failures.","published":"2026-06-10T20:22:39.262Z","modified":"2026-09-01T17:40:44.516937859Z","cvss":null,"epss":{"score":0.00517,"percentile":0.42004,"asOf":"2026-09-02"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"kafka-python","fixedVersion":"2.3.2"}],"fix":{"url":"https://github.com/dpkp/kafka-python/commit/6e4831444f972d169cdd11f5c8d50333cea3f19b","label":"dpkp/kafka-python@6e48314"},"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-10143.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:28571"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:30076"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:33683"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:41066"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42796"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-10143"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10143.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-10143"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/kafka-python-prior-to-dos-via-scram-iteration-count-in-scram-py"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2487722"},{"type":"REPORT","url":"https://github.com/dpkp/kafka-python/pull/3019"},{"type":"REPORT","url":"https://github.com/dpkp/kafka-python/pull/3026"},{"type":"FIX","url":"https://github.com/dpkp/kafka-python/commit/6e4831444f972d169cdd11f5c8d50333cea3f19b"},{"type":"PACKAGE","url":"https://github.com/dpkp/kafka-python"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-01T17:40:44.516937859Z"}}