CVE-2026-42530 Vulnerability Analysis & Exploit Details

CVE-2026-42530
Vulnerability Scoring

8.1
/10
Severe Risk

Cybersecurity professionals consider CVE-2026-42530 an immediate threat requiring urgent mitigation.

Attack Complexity Details

  • Attack Complexity: High
    Exploits require significant effort and special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-42530 Details

Status: Analyzed

Last updated: 🕗 02 Jul 2026, 20:03 UTC
Originally published on: 🕒 17 Jun 2026, 15:16 UTC

Time between publication and last update: 15 days

CVSS Release: version 3

CVSS3 Source

f5sirt@f5.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVE-2026-42530 Vulnerability Summary

CVE-2026-42530: 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.

Assessing the Risk of CVE-2026-42530

Access Complexity Graph

The exploitability of CVE-2026-42530 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-42530

CVE-2026-42530 presents a challenge to exploit due to its high attack complexity, but the absence of privilege requirements still makes it a viable target for skilled attackers. A thorough security review is advised.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-42530, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-42530, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2026-42530 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: High
    CVE-2026-42530 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: High
    CVE-2026-42530 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2026-42530 References

External References

CWE Common Weakness Enumeration

CWE-416

Vulnerable Configurations

  • cpe:2.3:a:f5:nginx_gateway_fabric:1.3.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:1.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:1.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:1.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:1.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:1.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:1.5.1:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:1.5.1:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:1.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:1.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:1.6.1:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:1.6.1:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:1.6.2:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:1.6.2:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.0.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.0.1:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.0.2:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.0.2:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.1.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.1.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.1.1:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.1.1:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.1.2:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.1.2:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.1.3:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.1.3:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.1.4:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.1.4:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.2.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.2.1:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.2.1:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.2.2:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.2.2:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.3.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.4.1:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.4.1:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.4.2:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.4.2:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.5.1:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.5.1:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.6.1:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.6.1:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.6.2:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.6.2:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_gateway_fabric:2.6.3:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_gateway_fabric:2.6.3:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:3.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:3.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:3.5.1:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:3.5.1:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:3.5.2:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:3.5.2:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:3.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:3.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:3.6.1:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:3.6.1:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:3.6.2:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:3.6.2:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:3.7.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:3.7.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:3.7.1:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:3.7.1:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:3.7.2:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:3.7.2:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:5.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:5.0.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:5.3.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:5.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:5.3.2:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:5.3.2:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:5.3.3:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:5.3.3:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:5.3.4:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:5.3.4:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:5.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:5.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:5.4.1:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:5.4.1:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:5.4.2:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:5.4.2:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:5.4.3:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:5.4.3:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:5.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:5.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:4.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:4.0.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_ingress_controller:4.0.1:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_ingress_controller:4.0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_instance_manager:2.17.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_instance_manager:2.17.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_instance_manager:2.17.1:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_instance_manager:2.17.1:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_instance_manager:2.17.2:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_instance_manager:2.17.2:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_instance_manager:2.17.3:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_instance_manager:2.17.3:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_instance_manager:2.17.4:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_instance_manager:2.17.4:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_instance_manager:2.18.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_instance_manager:2.18.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_instance_manager:2.19.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_instance_manager:2.19.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_instance_manager:2.19.1:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_instance_manager:2.19.1:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_instance_manager:2.21.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_instance_manager:2.21.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_instance_manager:2.22.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_instance_manager:2.22.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_open_source:1.31.0:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_open_source:1.31.0:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_open_source:1.31.1:*:*:*:*:*:*:*
    cpe:2.3:a:f5:nginx_open_source:1.31.1:*:*:*:*:*:*:*

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