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Atomicorp WAF Rule 345270

Rule Summary

  • Rule ID: 345270
  • Status: Active
  • Alert message: Atomicorp.com WAF Rules: CVE-2026-9256 tripwire: over-long URI path segment
  • Observed CWEs: None documented
  • Revision: 1
  • Rule severity: Warning
  • Phase: 1 (request headers)
  • Request surfaces: Request URI
  • Rule action: pass
  • Public tags: CVE-2026-9256, application-multi, attack-protocol, language-multi, nginx, platform-multi
  • Logging: log

Description

This rule detects behavior identified by its current alert as “CVE-2026-9256 tripwire: over-long URI path segment” in the request URI. It evaluates during the request headers phase and records the match without a disruptive action.

CVEs Referenced by This Rule

The current ModSecurity rule metadata explicitly names the following CVEs. These references explain the rule author’s association; they do not claim that the rule is limited to these vulnerabilities or that this is an exhaustive coverage list.

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.

This is a selected list of documented research observations, not an exhaustive coverage matrix. Absence of a CVE does not imply absence of protection.

No selected related public CVE research notes are currently published.