CVE-2026-15176 NGINX - Buffer Overflow

NGINX Plus and NGINX Open Source contain a heap buffer overflow caused by use of alias directive with rewrite and set or return referencing $request_filename, letting unauthenticated attackers cause DoS or code execution, exploit requires crafted HTTP requests.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Denial Of Service, Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
14 October 2026
Updated
15 October 2026
Weakness
CWE-122

Vendor fix

Update to the latest supported version of NGINX Plus or NGINX Open Source.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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