CVE-2026-1642
Last modified
CVE-2026-1642 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. 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.. EPSS estimates a 0.34% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| F5 | Nginx Gateway Fabric | >= 1.2.0, <= 1.6.2 | — |
| F5 | Nginx Gateway Fabric | >= 2.0.0, < 2.4.1 | — |
| F5 | Nginx Ingress Controller | >= 3.4.0, <= 3.7.2 | — |
| F5 | Nginx Ingress Controller | >= 4.0.0, <= 4.0.1 | — |
| F5 | Nginx Ingress Controller | >= 5.0.0, < 5.3.3 | — |
| F5 | Nginx Instance Manager | >= 2.15.1, <= 2.21.0 | — |
| F5 | Nginx Open Source | >= 1.3.0, < 1.28.2 | — |
| F5 | Nginx Open Source | >= 1.29.0, < 1.29.5 | — |
| F5 | Nginx Plus | >= r33, < r35 | — |
| F5 | Nginx Plus | r32 | — |
| F5 | Nginx Plus | r33 | P1 |
| F5 | Nginx Plus | r34 | P1 |
| F5 | Nginx Plus | r35 | — |
| F5 | Nginx Plus | r36 | — |
References
- https://my.f5.com/manage/s/article/K000159824Vendor Advisory
- https://www.openwall.com/lists/oss-security/2026/02/05/1Mailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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