---
cve: "CVE-2026-6879"
severity: "LOW"
cvss: 2.0
epss: "36%"
vendor: "Python Software Foundation"
kev: false
exploited: false
published: "2026-07-28 15:17:51"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-09T15:32:40+02:00"
---

# CVE-2026-6879

> 2.0 LOW · 🧪 PoC

## Beschreibung

`Element.findall()` and fully-consumed `Element.iterfind()` exhibit `O(n^2)` time complexity when using XPath index predicates (e.g. `[1]`, `[last()]`, `[last()-N]`) on XML documents with many same-tag siblings. `Element.find()` is only affected when the first match is near the end  of the sibling list, such as with `[last()]` or `[last()-N]`;  `.//item[1]` short-circuits after the first match.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/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 | Hoch | good |

## Patch verfügbar (OSV)

- 3a19c2f0b3e91ce8f23d0cc64d4c9ee557823f24 (Commit)
- 41388c9cb160d0886d5ca00d2e6c8782608a4549 (Commit)

## Referenzen

- <https://github.com/python/cpython/pull/152676>
- <https://github.com/python/cpython/issues/152674>
- <https://mail.python.org/archives/list/security-announce@python.org/thread/7YMZ6DDZVR26TJJBVO3RDNBAVGHNYAKR/>
- <https://github.com/python/cpython/commit/2ffab083782968a4d732738f4f1dff6bbd69d2b0>
- <https://github.com/python/cpython/commit/02c08e6b747ac43d0d866a4ffa916bedf3423f81>
- <https://github.com/python/cpython/commit/390337b8ba1658833fdef379e1739c9f9533a8db>
- <https://github.com/python/cpython/commit/cb409342a19f25656f62e679f8bac265fe1442c3>
- <https://github.com/python/cpython/commit/96510a3758f4a075f43223afdee3b6ee1a7a7f02>
- <https://github.com/python/cpython/commit/037965c00a427cba5c05447efadc67c51a492e85>
- <https://github.com/python/cpython/commit/0583f24ae678993e3f7939f51ad5bcae5ad9dc70>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-6879) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_