Skip to content
CVE PROGRAM SOURCE RECORD9.2 Critical

CVE-2026-42945

NGINX ngx_http_rewrite_module vulnerability

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
f5

Description

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when the rewrite directive is followed by a rewrite, if, or set directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its 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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

F5 NGINX Plus

Default version status: unknown

  • R37 to < *unaffected
  • R36 to < R36 P4affected
  • R32 to < R32 P6affected

F5 NGINX Open Source

Default version status: unaffected

  • 1.31.0 to < *unaffected
  • 0.6.27 to < 1.30.1affected

References