anonhaven

CVE-2026-90439

MEDIUM CVSS 4.0: 6.9 EPSS 0.26%
Updated Sep 16, 2026
Nginx
Parameter Value
CVSS 6.9 (MEDIUM)
Type CWE-122 (Heap-based Buffer Overflow)
Vendor Nginx
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
None
No data leak
Integrity
Low
Partial data modification
Availability
Low
Partial disruption

CVSS Vector v4.0

Weakness Type (CWE)

CWE-122 Heap-based Buffer Overflow

References 1

https://my.f5.com/manage/s/article/K000162604
f5sirt@f5.com
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