PT-2026-60178 · F5 · Nginx Open Source+1

Publicado 2026-07-15 · Atualizado 2026-07-15 · CVE-2026-42533

NVD

CVSS v3.1

8.1

Alta

Vetor base

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Correção

Heap Based Buffer Overflow

Enumeração de Fraquezas

CWE-122

Identificadores relacionados

CVE-2026-42533

Produtos afetados

Nginx Open Source

Nginx Plus

Referências · 2

• https://my.f5.com/manage/s/article/K000162097 · Correção, Aviso do Fabricante
• https://nvd.nist.gov/vuln/detail/CVE-2026-42533 · Nota de Segurança