Answer in brief
CVE-2026-90439 records a Medium severity (CVSS 6.9) vulnerability in NGINX ngx_http_v3_module vulnerability. The current sources do not mark it as known exploited. The current feed maps F5/NGINX Open Source (generic), F5/NGINX Plus (generic), F5/NGINX Plus (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps F5/NGINX Open Source (generic), F5/NGINX Plus (generic), F5/NGINX Plus (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| F5/NGINX Open Sourcegeneric | >=1.29.2 <1.31.6 || >=1.30.4 <1.30.5 | 1.31.6, 1.30.5 |
| F5/NGINX Plusgeneric | >=37.1.0.1 <37.1.1.2 || >=37.0.0.1 <37.0.6.2 | 37.1.1.2, 37.0.6.2 |
| F5/NGINX Plusgeneric | >=37.1.0.1 <37.1.1.1 || >=37.0.0.1 <37.0.6.1 | 37.1.1.1, 37.0.6.1 |
Published upstream
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.