CVE-2026-42533High· 8.1▾ MidnightPoC availableA 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 …
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 44.6 · likelihood 1.3 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
6.3%
12 GitHub repos (last check)
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.
nginx_gateway_fabric >= 1.3.0, <= 1.6.2nginx_gateway_fabric >= 2.0.0, < 2.6.7nginx_ingress_controller >= 3.5.0, <= 3.7.2nginx_ingress_controller >= 5.0.0, < 5.5.3nginx_ingress_controller >= 2026-lts-r1, < 2026-lts-r4nginx_ingress_controller = 4.0.0nginx_ingress_controller = 4.0.1nginx_plus >= 37.0.0.1, < 37.0.3.1nginx_plus >= r33, < r36nginx_plus = r36waf >= 4.11.0, <= 4.16.0waf >= 5.2.0, <= 5.8.0waf >= 5.9.0, < 5.13.4Upgrade past the affected range:
nginx_gateway_fabric 2.6.7nginx_ingress_controller 2026-lts-r4nginx_plus r36waf 5.13.4Connected by shared product, vendor, weakness, or advisory.
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CVE-2026-93479High· 8.1A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and the root directive or access log format references the map's regex capture variables before referencing the map output variable
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