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$2) in a redirect or arguments context. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Schwachstellenklasse
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures (for example, ^/((.*))$) 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.
Betroffene Produkte
- f5 nginx_open_source
- f5 nginx_plus
- f5 dos
- f5 nginx_gateway_fabric
- f5 nginx_ingress_controller
- f5 nginx_instance_manager
- f5 waf
- redhat discovery
Quellen
- https://my.f5.com/manage/s/article/K000161377
- http://www.openwall.com/lists/oss-security/2026/05/22/14
- https://lists.debian.org/debian-lts-announce/2026/06/msg00023.html
- https://access.redhat.com/errata/RHSA-2026:20351
- https://access.redhat.com/errata/RHSA-2026:28212
- https://access.redhat.com/errata/RHSA-2026:28921
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