Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2026-42945

8.1 · HIGH

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module.

Published May 13, 2026CWE-122EPSS 3.40%

Overview

CVE-2026-42945 is a high-severity vulnerability. It was published on May 13, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refmy.f5.com/manage/s/article/K000161019Refdepthfirst.com/nginx-riftGitHubgithub.com/DepthFirstDisclosures/Nginx-RiftRefaccess.redhat.com/errata/RHSA-2026:17417Refaccess.redhat.com/errata/RHSA-2026:17751Refaccess.redhat.com/errata/RHSA-2026:17752Refaccess.redhat.com/errata/RHSA-2026:17753Refaccess.redhat.com/errata/RHSA-2026:17790Refaccess.redhat.com/errata/RHSA-2026:17791Refaccess.redhat.com/errata/RHSA-2026:17792

How CyberStrike helps

Frequently asked questions

What is CVE-2026-42945?

CVE-2026-42945 is a high-severity vulnerability. It was published on May 13, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-42945?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-42945?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-42945?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-42945 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2026

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999