9.2

CVE-2026-42533

Medienbericht

NGINX Map directive and Regex matching vulnerability

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
F5 ≫ Nginx Gateway Fabric Version >= 1.3.0 <= 1.6.2
F5 ≫ Nginx Gateway Fabric Version >= 2.0.0 < 2.6.7
F5 ≫ Nginx Ingress Controller SwEdition continuous_releases Version >= 3.5.0 <= 3.7.2
F5 ≫ Nginx Ingress Controller SwEdition continuous_releases Version >= 5.0.0 < 5.5.3
F5 ≫ Nginx Ingress Controller SwEdition long-term_support Version >= 2026-lts-r1 < 2026-lts-r4
F5 ≫ Nginx Ingress Controller Version 4.0.0 SwEdition continuous_releases
F5 ≫ Nginx Ingress Controller Version 4.0.1 SwEdition continuous_releases
F5 ≫ Nginx Plus Version >= 37.0.0.1 < 37.0.3.1
F5 ≫ Nginx Plus Version >= r33 < r36
F5 ≫ Nginx Plus Version r36 Update -
F5 ≫ Nginx Plus Version r36 Update p1
F5 ≫ Nginx Plus Version r36 Update p2
F5 ≫ Nginx Plus Version r36 Update p3
F5 ≫ Nginx Plus Version r36 Update p4
F5 ≫ Nginx Plus Version r36 Update p5
F5 ≫ Nginx Plus Version r36 Update p6
F5 ≫ Waf SwPlatform nginx Version >= 4.11.0 <= 4.16.0
F5 ≫ Waf SwPlatform nginx Version >= 5.2.0 <= 5.8.0
F5 ≫ Waf SwPlatform nginx Version >= 5.9.0 < 5.13.4
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 3.51% 0.881
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
F5 9.2 0 0
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
F5 8.1 2.2 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-122 Heap-based Buffer Overflow

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

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