CVE-2026-17084 — CVE & Security Advisory Radar

🎯 CVE-2026-17084 MEDIUM 6.0 🔥 EPSS 51% 🧪 PoC 🇪🇺 EUVD

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CVE-2026-17084 | The "stringprep" module didn't process characters from RFC 3454 tables B.2 or B.3 correctly: the latest Unicode codepoint attributes were used instead of the specified Unicode 3.2.0. This behavior would cause mismatches when processing domain names using IDNA 2003 (the "idna" codec) and the in_table_b2() function of the "stringprep" module. This only affects domain names containing characters that were not previously registered or had their Unicode attr

The "stringprep" module didn't process characters from RFC 3454 tables
B.2 or B.3 correctly: the latest Unicode codepoint attributes were used
instead of the specified Unicode 3.2.0. This behavior would cause
mismatches when processing domain names using IDNA 2003 (the "idna"
codec) and the in_table_b2() function of the "stringprep" module. This
only affects domain names containing characters that were not previously
registered or had their Unicode attributes such as case-folding
behavior updated since Unicode 3.2.0.

Klassifikation & Betroffenheit:

Python Software Foundation CPython 0 <3.15.0

Improper Control of Generation of Code ('Code Injection') 🎯 Medium

The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

🛡️ Empfohlene Mitigation: Refactor your program so that you do not have to dynamically generate code.

Vollständige Definition bei MITRE ➔

⚔️ Typische Angriffsmuster (CAPEC):

CAPEC-35 · Leverage Executable Code in Non-Executab… (Very High) CAPEC-77 · Manipulating User-Controlled Variables (Very High) CAPEC-242 · Code Injection (High)

🎯 ATT&CK-Techniken (Kill-Chain-Verhalten):

T1027.006 · Obfuscated Files or Information: H… T1027.009 · Obfuscated Files or Information: E… T1564.009 · Hide Artifacts: Resource Forking

🧩 Ähnliche Schwachstellen (Hersteller/Klasse/Score-Band):

CVE-2025-8194 7.5 CVE-2025-4435 7.5 CVE-2025-4138 7.5 CVE-2025-4330 7.5 CVE-2024-6232 7.5

🩹 Patch verfügbar (OSV):

🩹 5181304bcec9cfc3c15311741c9154cdff2e3fd7 (Commit) 🩹 7e109d084d55e7eb25837a5f3b47ef9beee547bc (Commit)

📰 Eigene Berichterstattung: ➔ CVE-2026-17084 | Python up to 3.15.x stringprep in_table_b2 interpretation confl

📚 Referenzen & Quellen:

🇪🇺 Original-Eintrag (ENISA EUVD) 🇺🇸 NVD-Eintrag

Ausnutzungs-Zeitleiste:

Reserviert 2026

Veröffentlicht 08/2026

Heute 06.09.

CVSS-Vektor-Analyse: 6.0

AV · Angriffsvektor Netzwerk

AC · Komplexität Gering

PR · Privilegien Keine

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

Veröffentlicht:18.08.2026

Aktualisiert:05.09.2026 01:16

Assigner (CNA):PSF

EUVD-ID:EUVD-2026-60889

Quellen: 🇪🇺 EUVD-Datenbank (ENISA) + 🇺🇸 NVD-Anreicherung · 24-h-Cache

CWE-94: Code Injection ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Sicherheits-Update des Herstellers zeitnah einspielen und Netzwerksegmentierung prüfen.

Tier	2026-08-29	2026-09-05
≥90 %	4	0
≥50 %	4	0
≥10 %	3	0
<10 %	304	300

6.0 MEDIUM

🇪🇺 EUVD

EPSS

51%

CVE-2026-17084 🌐 Netzwerk (Remote) 🔓 Keine Authentifizierung nötig

🧪 Python Software Foundation

CVE-2026-17084 | The "stringprep" module didn't process characters from RFC 3454 tables B.2 or B.3 correctly: the latest Unicode codepoint attributes were used instead of the specified Unicode 3.2.0. This behavior would cause mismatches when processing domain names using IDNA 2003 (the "idna" codec) and the in_table_b2() function of the "stringprep" module. This only affects domain names containing characters that were not previously registered or had their Unicode attr

CWE-94: Code Injection ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Sicherheits-Update des Herstellers zeitnah einspielen und Netzwerksegmentierung prüfen.

18.08.2026

🛡️ Details ➔

Zero-Day & Vulnerability Intelligence Hub