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CVE-2026-42945 is a high severity vulnerability with a CVSS score of 8.1. Exploits are available; patches have been released and should be applied urgently.
Very high probability of exploitation in the next 30 days
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
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, for systems with Address Space Layout Randomization (ASLR ) disabled, code execution is possible. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
| Vendor | Product |
|---|---|
| F5 | Waf |
| F5 | Nginx Gateway Fabric |
| F5 | Nginx Open Source |
| F5 | Nginx Plus |
| F5 | Dos |
| F5 | Nginx Ingress Controller |
| F5 | Nginx Instance Manager |
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