---
cve: "CVE-2026-15308"
severity: "HIGH"
cvss: 8.7
epss: "64%"
vendor: "Python Software Foundation"
kev: false
exploited: false
published: "2026-07-09 17:16:58"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T07:49:20+02:00"
---

# CVE-2026-15308

> 8.7 HIGH · 🧪 PoC

## Beschreibung

The incremental HTML parser (html.parser.HTMLParser) allows for CPU
denial-of-service through repeated unterminated markup declarations when
processing uncontrolled data.

## 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)

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

## Referenzen

- <https://mail.python.org/archives/list/security-announce@python.org/thread/F6453LWKSHKCTWFLCOURWPLETNUIW2Z5/>
- <https://github.com/python/cpython/pull/153031>
- <https://github.com/python/cpython/issues/153030>
- <https://github.com/python/cpython/commit/07efb08123ba9367a7107325adb9d5626dca1ca9>
- <https://github.com/python/cpython/commit/7933f4bf7131aa4140750f9404f5de0aa2969ced>
- <https://github.com/python/cpython/commit/bcf98ddbc40ec9b3ee87da0124a5660b19b7e606>
- <https://github.com/python/cpython/commit/e9f92ac0b298292e7ff998e52cb8ccacfb27a0bd>
- <https://github.com/python/cpython/commit/785df8f743800661961528970f8598edcd291c14>
- <https://github.com/python/cpython/commit/1e7956f1a722df9aabc509c30f8fbdc3a2b4fdc7>
- <https://github.com/python/cpython/commit/c2390b9376e35a701ed3acc597b8fc87546c9b00>
- <http://www.openwall.com/lists/oss-security/2026/07/09/4>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-15308) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_