# CVE-2026-1642

## Summary

- **CVE ID:** CVE-2026-1642
- **Severity:** HIGH
- **CVSS Score:** 8.2 (CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-349
- **Published:** Feb 4, 2026
- **Last Modified:** Mar 12, 2026

## Description

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.

## Affected Products

- F5 — NGINX Open Source (1.3.0)
- F5 — NGINX Plus (R36)
- F5 — NGINX Plus (R35)
- F5 — NGINX Plus (R34)
- F5 — NGINX Plus (R33)
- F5 — NGINX Plus (R32)

## References

- [CNA](https://my.f5.com/manage/s/article/K000159824)
- [CVE](http://www.openwall.com/lists/oss-security/2026/02/05/1)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.35%
- **EPSS Percentile:** 28.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._