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TI-2026-30812 Aliases CVE-2026-42530GHSA-5mcp-3252-f5vr

NGINX Open-Source ngx_http_v3_module vulnerability

Priority MEDIUM 51CWE-416Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.06218 93rd percentileScored 2026-11-07
Fix Fixed NGINX Open Source (F5): 1.31.2Red Hat: 1 advisory

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
F5NGINX Open Source1.31.0 to before 1.31.21.31.2Patch availableCNA
  • NGINX Open Source VendorF5 Affected 1.31.0 to before 1.31.2 Fixed in 1.31.2 Patch available CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*1.3.0 – 1.6.2; 2.0.0 to before 2.6.4VulnerableF5
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*3.5.0 – 3.7.2; 5.0.0 to before 5.5.1VulnerableF5
cpe:2.3:a:f5:nginx_ingress_controller:4.0.0:*:*:*:*:*:*:*4.0.0VulnerableF5
cpe:2.3:a:f5:nginx_ingress_controller:4.0.1:*:*:*:*:*:*:*4.0.1VulnerableF5
cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*2.17.0 – 2.22.0VulnerableF5
cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*1.31.0 to before 1.31.2VulnerableF5
  • cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:* Versions 1.3.0 – 1.6.2; 2.0.0 to before 2.6.4 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:* Versions 3.5.0 – 3.7.2; 5.0.0 to before 5.5.1 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_ingress_controller:4.0.0:*:*:*:*:*:*:* Versions 4.0.0 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_ingress_controller:4.0.1:*:*:*:*:*:*:* Versions 4.0.1 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:* Versions 2.17.0 – 2.22.0 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:* Versions 1.31.0 to before 1.31.2 Vulnerable ·F5

Remediation

  • Fix · CNA NGINX Open Source (F5) Fixed in 1.31.2

Red Hat 1 advisory

  • RHSA-2026:20351 Released 2026-05-23 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images nginx-1.30.2-1.hum1@aarch64, nginx-1.30.2-1.hum1@src, nginx-1.30.2-1.hum1@x86_64 +22

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Hardened ImagesFixed RHSA-2026:20351
Not affected: 4 products
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat Lightspeed proxy 1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42530
  2. 2026-10-03 Alias added: GHSA-5mcp-3252-f5vr
  3. 2026-10-25 EPSS moved to the 90th–95th percentile

References

Advisory 4

  • TI-2026-31136 NGINX ngx_http_rewrite_module vulnerability CVSS 4.0CRITICAL 9.2
  • TI-2026-30813 NGINX Map directive and Regex matching vulnerability CVSS 4.0CRITICAL 9.2
  • TI-2026-08132 NGINX ngx_http_rewrite_module vulnerability CVSS 4.0CRITICAL 9.2
  • TI-2026-30432 NGINX ngx_http_proxy_v2_module and ngx_http_grpc_module vulnerability CVSS 4.0CRITICAL 9.2
  • TI-2026-42786 NGINX ngx_http_slice_module vulnerability CVSS 4.0HIGH 8.8
  • TI-2026-36891 NGINX Gateway Fabric vulnerability CVSS 4.0HIGH 8.6
See all 17 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences