GHSA-2jcm-hq8r-84wx

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GHSA-2jcm-hq8r-84wx

Summary: kafka-python vulnerable to denial of service through an unbounded SCRAM iteration count

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.

References: https://nvd.nist.gov/vuln/detail/CVE-2026-10143, https://github.com/dpkp/kafka-python/pull/3026, https://github.com/dpkp/kafka-python/pull/3019, https://github.com/dpkp/kafka-python/commit/74400d7ef1b54ad24d4b8170c23b58d1cab65e4f, https://github.com/dpkp/kafka-python/commit/6e4831444f972d169cdd11f5c8d50333cea3f19b, https://www.vulncheck.com/advisories/kafka-python-prior-to-dos-via-scram-iteration-count-in-scram-py, https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-10143.json, https://github.com/pypa/advisory-database/tree/main/vulns/kafka-python/PYSEC-2026-2191.yaml, https://github.com/dpkp/kafka-python/releases/tag/2.3.2, https://github.com/dpkp/kafka-python, https://bugzilla.redhat.com/show_bug.cgi?id=2487722, https://access.redhat.com/security/cve/CVE-2026-10143, https://access.redhat.com/errata/RHSA-2026:42796, https://access.redhat.com/errata/RHSA-2026:41066, https://access.redhat.com/errata/RHSA-2026:33683, https://access.redhat.com/errata/RHSA-2026:30076, https://access.redhat.com/errata/RHSA-2026:28571