A 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. 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.
References
| Link | Resource |
|---|---|
| https://my.f5.com/manage/s/article/K000162607 |
Configurations
No configuration.
History
14 Oct 2026, 15:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-10-14 15:17
Updated : 2026-10-15 11:18
NVD link : CVE-2026-93479
Mitre link : CVE-2026-93479
CVE.ORG link : CVE-2026-93479
JSON object : View
Products Affected
No product.
CWE
CWE-122
Heap-based Buffer Overflow