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HIGH

CVE-2026-9256

NGINX ngx_http_rewrite_module vulnerability

CVSS v3

8.1

HIGH

Score EPSS

1.1 %

probabilité d’exploitation

CISA KEV

Non

exploitation connue

Exploitation

none

statut SSVC

Description

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.

Détails techniques

Vecteur CVSS v3
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Publiée le
2026-06-01
Dernière modification
2026-08-11
Titre MSRC
NGINX ngx_http_rewrite_module vulnerability

Questions fréquentes

Qu’est-ce que 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 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.

CVE-2026-9256 est-elle activement exploitée ?

Aucune exploitation active de CVE-2026-9256 n’est confirmée. Le score EPSS est de 1.1 %, soit la probabilité estimée d’exploitation dans les 30 prochains jours.

Quel est le score CVSS de CVE-2026-9256 ?

CVE-2026-9256 a un score de base CVSS v3 de 8.1 (gravité HIGH), avec le vecteur CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Autres vulnérabilités 2026 à trier

Classées par probabilité d’exploitation (EPSS).

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