CVE-2026-42945NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module.
Updated under an hour ago ()
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It affects f5 dos and 6 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.1 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-122, CWE-131
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Sep 10, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
f5 dos f5:dos | from 4.3.0 through 4.7.0; 4.8.0 | NVD |
f5 nginx_gateway_fabric f5:nginx_gateway_fabric | from 1.3.0 through 1.6.2; from 2.0.0 through 2.5.1 | NVD |
f5 nginx_ingress_controller f5:nginx_ingress_controller | from 3.5.0 through 3.7.2; from 4.0.0 through 4.0.1; from 5.0.0 through 5.4.1 | NVD |
f5 nginx_instance_manager f5:nginx_instance_manager | from 2.16.0 through 2.21.1 | NVD |
f5 nginx_open_source f5:nginx_open_source | from 0.6.27 through 1.30.0 | NVD |
f5 nginx_plus f5:nginx_plus | from r32 through r36 | NVD |
f5 waf f5:waf | from 4.9.0 through 4.16.0; from 5.1.0 through 5.8.0; from 5.9.0 through 5.12.1 | NVD |
References
- https://my.f5.com/manage/s/article/K000161019mitigation, vendor-advisory
- https://depthfirst.com/nginx-riftmitigation, technical-description, third-party-advisory
- https://github.com/DepthFirstDisclosures/Nginx-Riftexploit, third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:17417
- https://access.redhat.com/errata/RHSA-2026:17751
- https://access.redhat.com/errata/RHSA-2026:17752
- https://access.redhat.com/errata/RHSA-2026:17753
- https://access.redhat.com/errata/RHSA-2026:17790
- https://access.redhat.com/errata/RHSA-2026:17791
- https://access.redhat.com/errata/RHSA-2026:17792
- https://access.redhat.com/errata/RHSA-2026:17793
- https://access.redhat.com/errata/RHSA-2026:17794
- https://access.redhat.com/errata/RHSA-2026:18029
- https://access.redhat.com/errata/RHSA-2026:18041
- https://access.redhat.com/errata/RHSA-2026:18063
- https://access.redhat.com/errata/RHSA-2026:19159
- https://access.redhat.com/errata/RHSA-2026:19371
- https://access.redhat.com/errata/RHSA-2026:19372
- https://access.redhat.com/errata/RHSA-2026:19374
- https://access.redhat.com/errata/RHSA-2026:20442
- https://access.redhat.com/errata/RHSA-2026:20444
- https://access.redhat.com/errata/RHSA-2026:21275
- https://access.redhat.com/errata/RHSA-2026:22382
- https://access.redhat.com/errata/RHSA-2026:22383
- https://access.redhat.com/errata/RHSA-2026:22388
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.