CVE-2026-9256 — CVE-2026-9256 | NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rew… — CVE & Security Advisory Radar

🎯 CVE-2026-9256 🇪🇺 EUVD

💬 0 Diskussion 📄 .md Alle CVEs anzeigen ✕

CVE-2026-9256 | NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures (for example, ^/((.*))$) and a replacement string that references multiple such captures (for example, $1$2) in a redirect or arguments context. An unauthenticated attacker along with conditions beyond their control can e

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures (for example, ^/((.*))$) and a replacement string that references multiple such captures (for example, $1$2) in a redirect or arguments context. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Klassifikation & Betroffenheit:

F5 NGINX Open Source 1.30.0 <1.30.2NGINX Open Source 0.1.17 ≤0.9.7NGINX Plus R32 <R32 P7NGINX Plus 37.0 <37.0.1.1NGINX Plus R36 <R36 P5NGINX Open Source 1.31.0 <1.31.1f5 nginx_open_source *f5 nginx_open_source 1.31.0

Improper Restriction of Operations within the Bounds of a Memory Buffer 🎯 High

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

🛡️ Empfohlene Mitigation: Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, many languages that perform their own memory management, such as Java and Perl, are not subject to buffer overflows. Other languages, such as Ada and C#, typically provide overflow prot…

Vollständige Definition bei MITRE ➔

⚔️ Typische Angriffsmuster (CAPEC):

CAPEC-10 · Buffer Overflow via Environment Variable… (High) CAPEC-14 · Client-side Injection-induced Buffer Ove… (High) CAPEC-24 · Filter Failure through Buffer Overflow (High) CAPEC-42 · MIME Conversion (High) CAPEC-44 · Overflow Binary Resource File (Very High) CAPEC-45 · Buffer Overflow via Symbolic Links (High) CAPEC-100 · Overflow Buffers (Very High) CAPEC-123 · Buffer Manipulation (Very High)

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

CVE-2023-46747 9.8 CVE-2022-1388 9.8 CVE-2026-94127 9.3 CVE-2025-53521 9.3 CVE-2026-78689 9.2

🧪 Exploit-Evidenz:

🐙 suominen/CVE-2026-9256 🐙 W5M1n9/NGINX-ngx_http_rewrite_mo 🐙 3nou9h/CVE-2026-9256-Poc 🐙 06-ux/CVE-2026-9256-POC

🩹 Patch verfügbar (OSV):

🩹 a92a537860c7b87d3793d9eb41c9cf3ed833b53c (Commit) 🩹 dda57a2d256e8e1aa425c7ae715c2861e2e4b239 (Commit)

🇩🇪 BSI-Sicherheitshinweise: BSI · hoch · Splunk SOAR: Mehrere Schwachstellen ↗ BSI · hoch · Oracle Communications: Mehrere Schwachstellen ↗ BSI · hoch · NGINX Open Source und NGINX Plus: Schwachstelle ermöglicht Denial of S ↗

📚 Referenzen & Quellen:

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

Ausnutzungs-Zeitleiste:

Reserviert 2026

Veröffentlicht 05/2026

Heute 09.10.

CVSS-Vektor-Analyse: 9.2

AV · Angriffsvektor Netzwerk

AC · Komplexität Hoch

PR · Privilegien Keine

UI · Interaktion Keine

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

Veröffentlicht:22.05.2026

Aktualisiert:25.08.2026 13:19

Assigner (CNA):f5

EUVD-ID:EUVD-2026-31444

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

CWE-119: Memory Corruption ✓ Offizieller Patch / Advisory verfügbar

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

Tier	CVEs	Anteil
≥90 %	720	0,2 %
≥50 %	3.223	0,9 %
≥10 %	22.114	6,0 %
<10 %	341.968	92,9 %

9.2 CRITICAL

EPSS

2.7%

CVE-2026-9256 🌐 Netzwerk (Remote) 🔓 Keine Authentifizierung nötig

CVE-2026-9256 | NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures (for example, ^/((.*))$) and a replacement string that references multiple such captures (for example, $1$2) in a redirect or arguments context. An unauthenticated attacker along with conditions beyond their control can e

CWE-119: Memory Corruption ✓ Offizieller Patch / Advisory verfügbar

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

22.05.2026

🛡️ Details ➔

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