CVE-2026-42530

CVE Enrichment

CVSS: 9.2 CRITICAL
EPSS: 6.45%
EPSS Percentile: 93.72%
CISA KEV: Not listed

Description

NGINX Open Source has a vulnerability in the ngx_http_v3_module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This may cause a Use-after-Free in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Technical Details

CVSS Version: 4.0
CNA / NVD Source: [email protected]
Published: 17-Jun-2026 22:16
Last Modified: 26-Oct-2026 19:10
EPSS Date: 2026-10-30
CWE: CWE-416

CVSS Vector


            CVSS:4.0                            AV:N /
                            AC:H /
                            AT:N /
                            PR:N /
                            UI:N /
                            VC:H /
                            VI:H /
                            VA:H /
                            SC:N /
                            SI:N /
                            SA:N /
                            E:X /
                            CR:X /
                            IR:X /
                            AR:X /
                            MAV:X /
                            MAC:X /
                            MAT:X /
                            MPR:X /
                            MUI:X /
                            MVC:X /
                            MVI:X /
                            MVA:X /
                            MSC:X /
                            MSI:X /
                            MSA:X /
                            S:X /
                            AU:X /
                            R:X /
                            V:X /
                            RE:X /
                            U:X

Affected Products / Versions

f5 / nginx_gateway_fabric Source: NVD CPE · affected
Version / affected range: * · from (inclusive) 1.3.0 · through (inclusive) 1.6.2
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*
f5 / nginx_gateway_fabric Source: NVD CPE · affected
Version / affected range: * · from (inclusive) 2.0.0 · before (exclusive) 2.6.4
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*
f5 / nginx_ingress_controller Source: NVD CPE · affected
Version / affected range: * · from (inclusive) 3.5.0 · through (inclusive) 3.7.2
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*
f5 / nginx_ingress_controller Source: NVD CPE · affected
Version / affected range: * · from (inclusive) 5.0.0 · before (exclusive) 5.5.1
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*
f5 / nginx_ingress_controller Source: NVD CPE · affected
Version / affected range: 4.0.0
cpe:2.3:a:f5:nginx_ingress_controller:4.0.0:*:*:*:*:*:*:*
f5 / nginx_ingress_controller Source: NVD CPE · affected
Version / affected range: 4.0.1
cpe:2.3:a:f5:nginx_ingress_controller:4.0.1:*:*:*:*:*:*:*
f5 / nginx_instance_manager Source: NVD CPE · affected
Version / affected range: * · from (inclusive) 2.17.0 · through (inclusive) 2.22.0
cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*
f5 / nginx_open_source Source: NVD CPE · affected
Version / affected range: * · from (inclusive) 1.31.0 · before (exclusive) 1.31.2
cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*

References

Last enrichment sync: 30-Oct-2026 23:58
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (2)

F5 has released patches for two critical NGINX Open Source vulnerabilities, CVE-2026-42530 and CVE-2026-42055, that could allow remote unauthenticated attackers to execute code under certain configurations. F5 Patches Two Critical NGINX Flaws That Could Enable Remote Code Execution
#NGINX F5 Issues Out-of-Band Patches for Critical NGINX Vulnerabilities

CVE (4)

MITRE ATT&CK (1)

Vendors (1)

Products (10)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.