CVE-2026-42533 Vulnerability Analysis & Exploit Details

CVE-2026-42533
Vulnerability Scoring

8.1

/10

Severe Risk

Cybersecurity professionals consider CVE-2026-42533 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-2026-42533 Details

Status: Analyzed

Last updated: 🕒 10 Aug 2026, 15:28 UTC
Originally published on: 🕒 15 Jul 2026, 15:16 UTC

Time between publication and last update: 26 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-2026-42533 Vulnerability Summary

CVE-2026-42533: A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and a string expression references the map's regex capture variables before referencing the map output variable. Alternatively, the same result could be achieved by using a non-cacheable variable in a string expression under certain conditions. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow 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. Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or to possibly trigger a code execution. 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.

Assessing the Risk of CVE-2026-42533

Access Complexity Graph

The exploitability of CVE-2026-42533 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-2026-42533

CVE-2026-42533 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-2026-42533, 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-2026-42533, 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-2026-42533 can result in unauthorized access to sensitive data, severely compromising data privacy.
Integrity: High
CVE-2026-42533 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
Availability: High
CVE-2026-42533 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2026-42533 References

External References

https://my.f5.com/manage/s/article/K000162097

CWE Common Weakness Enumeration

CWE-122

CAPEC Common Attack Pattern Enumeration and Classification

Forced Integer Overflow CAPEC-92 This attack forces an integer variable to go out of range. The integer variable is often used as an offset such as size of memory allocation or similarly. The attacker would typically control the value of such variable and try to get it out of range. For instance the integer in question is incremented past the maximum possible value, it may wrap to become a very small, or negative number, therefore providing a very incorrect value which can lead to unexpected behavior. At worst the attacker can execute arbitrary code.

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_gateway_fabric:2.6.4:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_gateway_fabric:2.6.4:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_gateway_fabric:2.6.5:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_gateway_fabric:2.6.5:*:*:*:*:*:*:*
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:5.5.1:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_ingress_controller:5.5.1:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_ingress_controller:5.5.2:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_ingress_controller:5.5.2:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_ingress_controller:4.0.0:*:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_ingress_controller:4.0.0:*:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_ingress_controller:4.0.1:*:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_ingress_controller:4.0.1:*:*:*:continuous_releases:*:*:*
cpe:2.3:a:f5:nginx_plus:r33:-:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r33:-:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r34:-:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r34:-:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r35:-:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r35:-:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:-:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:-:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p1:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p1:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p2:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p2:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p3:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p3:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p4:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p4:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p5:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p5:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p6:*:*:*:*:*:*
cpe:2.3:a:f5:nginx_plus:r36:p6:*:*:*:*:*:*
cpe:2.3:a:f5:waf:4.11.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:4.11.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:4.12.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:4.12.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:4.13.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:4.13.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:4.14.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:4.14.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:4.15.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:4.15.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:4.16.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:4.16.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.2.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.2.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.3.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.3.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.4.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.4.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.5.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.5.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.6.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.6.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.7.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.7.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.8.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.8.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.9.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.9.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.10.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.10.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.11.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.11.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.11.1:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.11.1:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.12.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.12.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.12.1:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.12.1:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.13.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.13.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.13.1:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:waf:5.13.1:*:*:*:*:nginx:*:*

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