CVE-2026-10143

kafka-python prior to 2.3.2 DoS via SCRAM Iteration Count in scram.py

publishedCWE-400CWE-606

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.

Technical severity7.5 highCVSS 3.1 · CNA: VulnCheck

Published2026-06-10Source updated 2026-11-08

Collected2026-11-082 attributed sources

Fixes and workarounds

Fix

RHSA-2026:33683: Red Hat Quay 3.10 RHSA-2026:30076: Red Hat Quay 3.12 RHSA-2026:42796: Red Hat Quay 3.15 RHSA-2026:41066: Red Hat Quay 3.16 RHSA-2026:28571: Red Hat Quay 3.9

Source: ADP: redhat-SADP

Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Source: ADP: redhat-SADP

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: VulnCheck

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: VulnCheck

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: VulnCheck

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
kafka-python Dana Powers `kafka-python` pypi	≥ 0; < 2.3.2 (affected, git) Other versions: unknown	CNA: VulnCheck
Red Hat Quay 3.10 Red Hat `quay/quay-rhel8` https://catalog.redhat.com/software/containers/	≥ 1782487717; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Quay 3.12 Red Hat `quay/quay-rhel8` https://catalog.redhat.com/software/containers/	≥ 1781937357; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Quay 3.15 Red Hat `quay/quay-rhel8` https://catalog.redhat.com/software/containers/	≥ 1784351966; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Quay 3.16 Red Hat `quay/quay-rhel9` https://catalog.redhat.com/software/containers/	≥ 1783955846; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Quay 3.9 Red Hat `quay/quay-rhel8` https://catalog.redhat.com/software/containers/	≥ 1781878070; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 7.5 high	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`	CNA: VulnCheck
4.0 / 8.7 high	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`	CNA: VulnCheck
3.1 / 7.5 high	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`	ADP: redhat-SADP

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://github.com/dpkp/kafka-python/pull/3019CNA: VulnCheck · issue-tracking, patch
https://github.com/dpkp/kafka-python/commit/6e4831444f972d169cdd11f5c8d50333cea3f19bCNA: VulnCheck · patch
https://github.com/dpkp/kafka-python/pull/3026CNA: VulnCheck · issue-tracking, patch
https://www.vulncheck.com/advisories/kafka-python-prior-to-dos-via-scram-iteration-count-in-scram-pyCNA: VulnCheck · third-party-advisory
https://access.redhat.com/security/cve/CVE-2026-10143ADP: redhat-SADP · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2487722ADP: redhat-SADP · issue-tracking, x_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-10143.jsonADP: redhat-SADP · x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:33683ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30076ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:42796ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:41066ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:28571ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT

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