---
cve: "CVE-2026-49477"
severity: "HIGH"
cvss: 7.5
epss: "0.5%"
vendor: "facelessuser"
kev: false
exploited: false
published: "2026-07-14 20:51:29"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T14:43:55+02:00"
---

# CVE-2026-49477

> 7.5 HIGH · 🧪 PoC

## Beschreibung

Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.8.4, the CSS selector parser in soupsieve contains a regular expression vulnerable to catastrophic backtracking when processing an attribute selector with an unterminated quoted value in soupsieve/css_parser.py, allowing an attacker who can supply untrusted CSS selector strings to soupsieve.compile() or Beautiful Soup .select() / .select_one() to cause CPU exhaustion and denial of service. This issue is fixed in version 2.8.4.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 28108ab805818c832d9568142a99844fd95a0d39 (Commit)
- eb4397618709186c109400448c6043b728217dc3 (Commit)

## Referenzen

- <https://github.com/facelessuser/soupsieve/security/advisories/GHSA-836r-79rf-4m37>
- <https://github.com/facelessuser/soupsieve/commit/eb4397618709186c109400448c6043b728217dc3>
- <https://github.com/facelessuser/soupsieve/releases/tag/2.8.4>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-49477) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_