CVE-2026-90439

NGINX ngx_http_v3_module vulnerability

Assigner: f5
Reserved: 11.09.2026 Published: 15.09.2026 Updated: 15.09.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
CVSS Score: 6.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	Low
User Interaction	None	Availability Impact	Low

CVSS 3.1

CVSS Vector: 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
CVSS Score: 6.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	Low	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	F5
Product	NGINX Plus
Versions	Default: unknown affected from 37.1.0.1 to 37.1.1.1 (excl.) affected from 37.0.0.1 to 37.0.6.1 (excl.)

Vendor

Product

NGINX Plus

Versions

Default: unknown

affected from 37.1.0.1 to 37.1.1.1 (excl.)
affected from 37.0.0.1 to 37.0.6.1 (excl.)

Vendor	F5
Product	NGINX Open Source
Versions	Default: unaffected affected from 1.29.2 to 1.31.6 (excl.) affected from 1.30.4 to 1.30.5 (excl.)

Vendor

Product

NGINX Open Source

Versions

Default: unaffected

affected from 1.29.2 to 1.31.6 (excl.)
affected from 1.30.4 to 1.30.5 (excl.)

Workarounds

Disable HTTP/3 by removing "quic" from the "listen" directive. Alternatively, enable HTTP/3 by adding "quic" to all configured server blocks.

Credits

F5 acknowledges Banny Liao for bringing this issue to our attention and following the highest standards of coordinated disclosure. reporter

References

Problem Types

CWE-122 Heap-based Buffer Overflow CWE

Impacts

CAPEC-100 Overflow Buffers

CVE-2026-90439 PUBLISHED