CVE-2026-10143

HIGH EPSS 30.7%
Published Jun 10, 20263w ago · Modified Jun 17, 20262w ago
8.7 CVSS 4.0
High
Find Similar
Published Jun 10, 2026 3w ago
Last Modified Jun 17, 2026 2w ago

Description

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 Details

Base Score
8.7
Exploitability
—
Impact
—
Vector string
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
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
30.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-400 Uncontrolled Resource Consumption Resource Mgmt

Affected Products 1

VendorProductVersionRange
dpkpkafka-python* <2.3.2

References 4

  • github.com https://github.com/dpkp/kafka-python/commit/6e4831444f972d169cdd11f5c8d50333cea3f19b
    Patch
  • github.com https://github.com/dpkp/kafka-python/pull/3019
    Issue TrackingPatch
  • github.com https://github.com/dpkp/kafka-python/pull/3026
    Issue TrackingPatch
  • vulncheck.com https://www.vulncheck.com/advisories/kafka-python-prior-to-dos-via-scram-iteration-count-in-scram-py
    PatchThird Party Advisory

Remediation

  • github.com https://github.com/dpkp/kafka-python/commit/6e4831444f972d169cdd11f5c8d50333cea3f19b
    Patch
  • github.com https://github.com/dpkp/kafka-python/pull/3019
    Issue TrackingPatch
  • github.com https://github.com/dpkp/kafka-python/pull/3026
    Issue TrackingPatch
  • vulncheck.com https://www.vulncheck.com/advisories/kafka-python-prior-to-dos-via-scram-iteration-count-in-scram-py
    PatchThird Party Advisory