---
cve: "CVE-2026-10143"
severity: "HIGH"
cvss: 8.7
epss: "52%"
vendor: "Dana Powers"
kev: false
exploited: false
published: "2026-06-10 22:16:55"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T06:59:46+02:00"
---

# CVE-2026-10143

> 8.7 HIGH · 🧪 PoC

## Beschreibung

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-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 054b570c971f6747aeb01a130d80f7d156152e13 (Commit)
- 6e4831444f972d169cdd11f5c8d50333cea3f19b (Commit)

## Referenzen

- <https://github.com/dpkp/kafka-python/pull/3019>
- <https://github.com/dpkp/kafka-python/commit/6e4831444f972d169cdd11f5c8d50333cea3f19b>
- <https://github.com/dpkp/kafka-python/pull/3026>
- <https://www.vulncheck.com/advisories/kafka-python-prior-to-dos-via-scram-iteration-count-in-scram-py>
- <https://access.redhat.com/errata/RHSA-2026:28571>
- <https://access.redhat.com/errata/RHSA-2026:30076>
- <https://access.redhat.com/errata/RHSA-2026:33683>
- <https://access.redhat.com/errata/RHSA-2026:41066>
- <https://access.redhat.com/errata/RHSA-2026:42796>
- <https://access.redhat.com/security/cve/CVE-2026-10143>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2487722>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-10143.json>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-10143) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_