GHSA-2jcm-hq8r-84wx

Suggest an improvement
Source
https://github.com/advisories/GHSA-2jcm-hq8r-84wx
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-2jcm-hq8r-84wx/GHSA-2jcm-hq8r-84wx.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-2jcm-hq8r-84wx
Aliases
Downstream
CGA (8)
Published
2026-06-11T00:32:04Z
Modified
2026-09-10T03:50:55Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • 8.7 (High) CVSS_V4 - 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 CVSS Calculator
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.

Database specific 
{
    "cwe_ids":  [
        "CWE-400",
        "CWE-606"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-09-01T17:16:18Z",
    "nvd_published_at":  "2026-06-10T22:16:55Z",
    "severity":  "HIGH"
}
References

Affected packages

PyPI / kafka-python

Package

Name
kafka-python
View open source insights on deps.dev
Purl
pkg:pypi/kafka-python

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.3.2

Affected versions

0.*
0.9.0
0.9.1
0.9.2
0.9.3
0.9.4
0.9.5
1.*
1.0.0
1.0.1
1.0.2
1.1.0
1.1.1
1.2.0
1.2.1
1.2.2
1.2.3
1.2.4
1.2.5
1.3.0
1.3.1
1.3.2
1.3.3
1.3.4
1.3.5
1.4.0
1.4.1
1.4.2
1.4.3
1.4.4
1.4.5
1.4.6
1.4.7
2.*
2.0.0
2.0.1
2.0.2
2.0.3
2.0.4
2.0.5
2.0.6
2.1.0
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
2.2.0
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
2.2.7
2.2.8
2.2.9
2.2.10
2.2.11
2.2.12
2.2.13
2.2.14
2.2.15
2.2.16
2.2.17
2.2.18
2.2.19
2.2.20
2.3.0
2.3.1

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-2jcm-hq8r-84wx/GHSA-2jcm-hq8r-84wx.json"