---
cve: "CVE-2026-7210"
severity: "MEDIUM"
cvss: 6.3
epss: "0.7%"
vendor: "Python Software Foundation"
kev: false
exploited: false
published: "2026-05-11 18:16:42"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-10-29T06:23:01+01:00"
---

# CVE-2026-7210

> 6.3 MEDIUM · 🧪 PoC

## Beschreibung

`xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\r\n\r\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.

## CNA-Record (Kanon, cvelistV5)

- CNA: **PSF**
- State: PUBLISHED
- Stand: 2026-10-02 00:35:51
- CNA-CVSS: **6.3** (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
```

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

## Schwachstellen-Klasse

- **CWE-331** — Insufficient Entropy
  The product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others.

## Angriffsmuster (CAPEC)

- [CAPEC-59 — Session Credential Falsification through Prediction](https://capec.mitre.org/data/definitions/59.html) _(Severity: High)_

## Patch verfügbar (OSV)

- fd17997c3866d61e0e7bd8201b1d8f35b40a40bd (Commit)
- c63aec69bd59c55314c06c23f4c22c03de76fe45 (Commit)

## BSI-Hinweise (deutsch)

- [CPython: Schwachstelle ermöglicht Denial of Service](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-1472) — _BSI-Einstufung: niedrig_
  Ein entfernter, anonymer Angreifer kann eine Schwachstelle in CPython ausnutzen, um einen Denial of Service Angriff durchzuführen.

## Referenzen

- <https://mail.python.org/archives/list/security-announce@python.org/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/>
- <https://github.com/python/cpython/pull/149023>
- <https://github.com/python/cpython/issues/149018>
- <https://github.com/python/cpython/commit/24b8f12544468e4cedf5bfbe25442fcd495391e4>
- <https://github.com/python/cpython/commit/3573b3b1ecbd99030a0b18658e1bfece771b2566>
- <https://github.com/python/cpython/commit/eeea765cb9d8f1fc3d8918b272ac3c477983f27a>
- <https://github.com/python/cpython/commit/fc9b11ff49cbc82e6f917d07a61517a2b5f3145f>
- <https://github.com/python/cpython/commit/e37df2a6a71d6538698e2d3188a7c345b827640b>
- <https://github.com/python/cpython/commit/cbaecf9f16da611a646d507c1cbca265c588fc56>
- <https://github.com/python/cpython/commit/ea70712d1a8508e14e9677d44f838dab04dc0286>
- <http://www.openwall.com/lists/oss-security/2026/05/11/13>
- <http://www.openwall.com/lists/oss-security/2026/05/11/8>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-7210/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_