# CVE-2026-90439

## Summary

- **CVE ID:** CVE-2026-90439
- **Severity:** MEDIUM
- **CVSS Score:** 6.9 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N)
- **CWE:** CWE-122
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 16, 2026

## Description

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module. When using HTTP/3 with OpenSSL versions <= OpenSSL 3.5.0 under certain configurations, a limited heap buffer overflow could happen while processing a TLS handshake. This can happen in a non-deterministic manner that is beyond the attacker's control. This may cause a heap buffer overflow in the NGINX worker process leading to a restart and/or limited data corruption.

Impact:
This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or limited data corruption. There is no control plane exposure; this is a data plane issue only.




Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

## Affected Products

- F5 — NGINX Plus (37.1.0.1)
- F5 — NGINX Plus (37.0.0.1)
- F5 — NGINX Open Source (1.29.2)
- F5 — NGINX Open Source (1.30.4)

## References

- [CNA](https://my.f5.com/manage/s/article/K000162604)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.26%
- **EPSS Percentile:** 17.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._