CVE-2026-90439

NGINX ngx_http_v3_module vulnerability

MEDIUM

6.5

CVSS Score

Published: September 15, 2026 at 02:27 PM UTC

Updated: September 18, 2026 at 07:49 PM UTC

2 products affected across 1 vendorNGINX PlusNGINX Open Source

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

NGINX Open Source · F5

60%

1.29.2 ≤ v < 1.31.61.30.4 ≤ v < 1.30.51.29.2 1.30.4

Affected range stops below 1.30.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.31.6, so it looks safe — our inference, not a vendor statement

NGINX Plus · F5

60%

37.0.0.1 ≤ v < 37.0.6.237.1.0.1 ≤ v < 37.1.1.237.0.0.1 37.1.0.1

Affected range stops below 37.0.6.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 37.1.1.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://my.f5.com/manage/s/article/K000162604

References (1)

Vendor Advisory

Source: cverecord

https://my.f5.com/manage/s/article/K000162604

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMf5

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: LOW
Availability: LOW

Vector?

Quick Info

StatusAWAITING ANALYSIS

CWE

CWE-122

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