CVE-2026-1642A vulnerability exists in NGINX OSS and NGINX Plus when configured to proxy to upstream Transport Layer Security (TLS) servers.
Updated under an hour ago ()
Does this affect you?
It affects f5 nginx_gateway_fabric and 4 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
A vulnerability exists in NGINX OSS and NGINX Plus when configured to proxy to upstream Transport Layer Security (TLS) servers. An attacker with a man-in-the-middle (MITM) position on the upstream server side—along with conditions beyond the attacker's control—may be able to inject plain text data into the response from an upstream proxied server. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
- CVSS
- 5.9 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- Weakness (CWE)
- CWE-349, CWE-345
- 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
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
f5 nginx_gateway_fabric f5:nginx_gateway_fabric | from 1.2.0 through 1.6.2; from 2.0.0 before 2.4.1 | NVD |
f5 nginx_ingress_controller f5:nginx_ingress_controller | from 3.4.0 through 3.7.2; from 4.0.0 through 4.0.1; from 5.0.0 before 5.3.3 | NVD |
f5 nginx_instance_manager f5:nginx_instance_manager | from 2.15.1 through 2.21.0 | NVD |
f5 nginx_open_source f5:nginx_open_source | from 1.3.0 before 1.28.2; from 1.29.0 before 1.29.5 | NVD |
f5 nginx_plus f5:nginx_plus | from r33 before r35; r32; r32; r32; r32; r33; r33; r33; and 5 more ranges | NVD |
References
- https://my.f5.com/manage/s/article/K000159824vendor-advisory
- http://www.openwall.com/lists/oss-security/2026/02/05/1mailing-list, third-party-advisory
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.