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

> CVE-2026-93479: NGINX map directive and regex matching vulnerability. CVSS 8.1 (CVSS 3.1), named in 2 status incident(s).

Canonical: https://rewindex.com/cve/CVE-2026-93479
Last updated: 2026-10-23T21:51:37Z

- Published: 2026-10-14 14:40 UTC · Updated: 2026-10-23 21:51 UTC · Assigner: f5
- CVSS: 8.1 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: n/a
- CISA KEV: no
- CWE: CWE-122

## 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.

## Affected vendors and products

- F5: NGINX Open Source
- F5: NGINX Plus

## Status incidents that name it

- 2026-10-22 20:17 UTC [Akamai: Customer Security Advisory: Critical F5/NGINX Out-of-Band Vulnerabilities](https://rewindex.com/company/akamai/incidents/whj5crxg5ft5.md) (says not affected, matched “not vulnerable” elsewhere in the notice): “…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…”
- 2026-10-22 20:08 UTC [Linode (Akamai): Customer Security Advisory: Critical F5/NGINX Out-of-Band Vulnerabilities](https://rewindex.com/company/linode-akamai/incidents/8dqqkh4d9y2c.md) (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…”

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-93479)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-93479)
- [https://my.f5.com/manage/s/article/K000162607](https://my.f5.com/manage/s/article/K000162607)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-93479 · Markdown: https://rewindex.com/cve/CVE-2026-93479.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-93479 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:11:21.037Z