🔴 严重 | CVE-2026-42533 — A vulnerability exists in NGINX Plus and NGINX Ope...
🔴 《严重安全漏洞：CVE-2026-42533》
CVSS 评分: 严重（9.2） 状态: Received 发布时间: 2026-07-15
漏洞描述
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.
🔍 技术细节
| 字段 | 值 |
|---|---|
| CVE ID | CVE-2026-42533 |
| CVSS 评分 | 9.2 🔴 |
| 严重程度 | 严重 |
| CVSS 向量 | 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 |
| CWE 分类 | CWE-122 |
| 发布时间 | 2026-07-15 |
| 最后更新 | 2026-07-15 |
| 状态 | Received |
| 数据来源 | f5sirt@f5.com |