CVE-2026-42533

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.

如何修補 CVE-2026-42533

要修補 CVE-2026-42533,請將受影響套件升級到下列已修補版本。

• —升級至 1.26.3-r2 或更新版本
• —升級至 1.30.4 或更新版本
• —升級至 1.30.4 或更新版本
• —未列出修補版本

CVE-2026-42533 正在被利用嗎?

低 — EPSS 為 0.8%,目前沒有觀察到大規模利用活動。

受影響套件(4)

• from 0, < 1.26.3-r2
• >= 0.9.6, < 1.30.4, >= 1.31.2, < 1.31.3
• >= 0.9.6, < 1.30.4, >= 1.31.2, < 1.31.3
• from 0

CVSS 分數

參考連結(4)

• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2026-42533
• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2026-42533
• WEBmy.f5.com/manage/s/article/K000162097
• WEBnvd.nist.gov/vuln/detail/CVE-2026-42533