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Fencer Vulns
high 7.5

CVE-2026-10143 json

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

published 2026-06-10 4 mo ago modified 2026-11-08 17 h ago also EUVD-2026-36128 , GHSA-2jcm-hq8r-84wx , PYSEC-2026-2191

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi kafka-python 2.3.2
  • Red Hat Red Hat Quay 3.10 1782487717
  • Red Hat Red Hat Quay 3.12 1781937357
  • Red Hat Red Hat Quay 3.15 1784351966
  • Red Hat Red Hat Quay 3.16 1783955846
  • Red Hat Red Hat Quay 3.9 1781878070
  • python-kafka Debian 14 2.0.2-12

debian advisories DEBIAN-CVE-2026-10143

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-10143 updated cvss 7.5

kafka-python: kafka-python: Denial of Service via excessive SCRAM authentication iteration count

  • Red Hat Quay 3.9 quay/quay-rhel8 1781878070
    fixed: vendor fix RHSA-2026:28571
  • Red Hat Quay 3.10 quay/quay-rhel8 1782487717
    fixed: vendor fix RHSA-2026:33683
  • Red Hat Quay 3.12 quay/quay-rhel8 1781937357
    fixed: vendor fix RHSA-2026:30076
  • Red Hat Quay 3.14 quay/quay-rhel8 1788593843
    fixed: vendor fix RHSA-2026:70267
  • Red Hat Quay 3.15 quay/quay-rhel8 1784351966
    fixed: vendor fix RHSA-2026:42796
  • Red Hat Quay 3.16 quay/quay-rhel9 1783955846
    fixed: vendor fix RHSA-2026:41066
  • Red Hat Quay 3.17 quay/quay-rhel9 1786181981
    fixed: vendor fix RHSA-2026:54395
  • Red Hat Quay 3.9 quay/clair-rhel8 1781938913, quay/quay-builder-rhel8 1781620752, quay/quay-operator-rhel8 1781939020, quay/quay-operator-bundle 1781942833, quay/quay-bridge-operator-rhel8 1781938954, quay/quay-bridge-operator-bundle 1781942234, +3 more Red Hat Quay 3.10 quay/clair-rhel8 1782331561, quay/quay-builder-rhel8 1781620407, quay/quay-operator-rhel8 1782331416, quay/quay-operator-bundle 1782492284, quay/quay-bridge-operator-rhel8 1782331379, quay/quay-bridge-operator-bundle 1782333017, +3 more Red Hat Quay 3.12 quay/clair-rhel8 1782331838, quay/quay-builder-rhel8 1781620617, quay/quay-operator-rhel8 1782332068, quay/quay-operator-bundle 1782333960, quay/quay-bridge-operator-rhel8 1782331980, quay/quay-bridge-operator-bundle 1782333480, +3 more Red Hat Quay 3.14 quay/clair-rhel8 1788593782, quay/quay-builder-rhel8 1788593707, quay/quay-operator-rhel8 1788593658, quay/quay-operator-bundle 1788598271, quay/quay-bridge-operator-rhel8 1788594258, quay/quay-bridge-operator-bundle 1788595604, +3 more Red Hat Quay 3.15 quay/clair-rhel8 1784351652, quay/quay-builder-rhel8 1784351680, quay/quay-operator-rhel8 1784351641, quay/quay-operator-bundle 1784356254, quay/quay-bridge-operator-rhel8 1784351655, quay/quay-bridge-operator-bundle 1784352589, +3 more Red Hat Quay 3.16 quay/clair-rhel9 1783749100, quay/quay-builder-rhel9 1783748231, quay/quay-operator-rhel9 1783748063, quay/quay-operator-bundle 1783961339, quay/quay-bridge-operator-rhel9 1783748414, quay/quay-bridge-operator-bundle 1783749615, +3 more
    +1 more products
    Red Hat Quay 3.17 quay/clair-rhel9 1786181669, quay/quay-builder-rhel9 1786181688, quay/quay-operator-rhel9 1786181701, quay/quay-operator-bundle 1786429805, quay/quay-bridge-operator-rhel9 1786181654, quay/quay-bridge-operator-bundle 1786182526, +3 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 8.7 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
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 8.7 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
pypi kafka-python
<2.3.2
2.3.2

Affected products

  • Dana Powers kafka-python
  • Red Hat Red Hat Quay 3.10
  • Red Hat Red Hat Quay 3.12
  • Red Hat Red Hat Quay 3.15
  • Red Hat Red Hat Quay 3.16
  • Red Hat Red Hat Quay 3.9

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-606 Unchecked Input for Loop Condition

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.