Rewindex/CVEs

CVE-2026-93479: NGINX map directive and regex matching vulnerability

Description

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.

Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H · CWE-122

Status incidents that name it

• Akamai Customer Security Advisory: Critical F5/NGINX Out-of-Band Vulnerabilities
  2026-10-22 20:17 UTC · No impact listed · says not affected (notice says “not vulnerable”)

  “…the potential impact of the recently published F5/NGINX vulnerabilities (CVE-2026-15176, CVE-2026-97205, and CVE-2026-93479) across our platform and infrastructure. Customers and partners with a valid Control Center login can find more…”

• Linode (Akamai) Customer Security Advisory: Critical F5/NGINX Out-of-Band Vulnerabilities
  2026-10-22 20:08 UTC · No impact listed · names this CVE

  “Vulnerabilities Akamai is aware of the recently published F5/NGINX vulnerabilities (CVE-2026-15176, CVE-2026-97205, and CVE-2026-93479), and our teams are actively investigating their potential impact across our platform and infrastructure. F5 has…”

Affected vendors and products

F5: NGINX Open SourceF5: NGINX Plus

References

• CVE record on cve.org (opens in new tab)
• NVD entry (opens in new tab)
• my.f5.com/manage/s/article/K000162607 (opens in new tab)

All CVEsMarkdownJSON

• CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
• This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
• Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
• EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)