CVE-2026-10143kafka-python prior to 2.3.2 DoS via SCRAM Iteration Count in scram.py
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It affects Dana Powers kafka-python and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-400, CWE-606
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Modified
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Dana Powers kafka-python dana_powers:kafka_python (from the name) | before 2.3.2 | CNA record |
Red Hat Red Hat Quay 3.10 redhat:quay | from 1782487717 not affected | CISA ADP |
dpkp kafka-python dpkp:kafka-python | before 2.3.2 | NVD |
References
- https://github.com/dpkp/kafka-python/pull/3019issue-tracking
- https://github.com/dpkp/kafka-python/commit/6e4831444f972d169cdd11f5c8d50333cea3f19bpatch
- https://github.com/dpkp/kafka-python/pull/3026issue-tracking
- https://www.vulncheck.com/advisories/kafka-python-prior-to-dos-via-scram-iteration-count-in-scram-pythird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.