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Highest advisory severityCritical 2 vendors · 2 advisories

CVE-2026-15176

vulnerability exists in NGINX Plus and NGINX Open Source when a location is configured that uses the alias directive together with rewrite and a set or return directive referencing the $request_filename variable

CVE-2026-15176: vulnerability exists in NGINX Plus and NGINX Open Source when a location is configured that uses the alias directive together with rewrite and…

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

NVD detail CVE.org

CVE-2026-15176 at a glance

CISA KEV
Not listed (catalog checked )
Highest advisory severity
Critical
CVSS base score
9.2 (F5), 8.1 (Red Hat)
Weakness
CWE-122
Fixed releases
  • F5: 37.1.0.1, 37.0.5.1, 1.31.7, 1.30.6
  • Red Hat: nginx-main-1.30.6-1.hum1, RHSA-2026:83427
Vendor advisories
2 from F5, Red Hat
VulniPulse record
Published · Updated

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-15176; bulletin-wide values are not repeated here.

Is CVE-2026-15176 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-15176 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-15176?

Upgrade to a fixed release named by the vendor:

  • F5: 37.1.0.1, 37.0.5.1, 1.31.7, 1.30.6
  • Red Hat: nginx-main-1.30.6-1.hum1, RHSA-2026:83427
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. (Red Hat)

Vendor advisory comparison

F5

1 advisory
  • Advisory severityCritical9.2

    Critical [CVE-2026-15176] vulnerability exists in NGINX Plus and NGINX Open Source when a location is configured that uses the alias directive together with rewrite and a set or return directive referencing the $request_filename variable

    CVE-2026-15176Source published Source updated

    A vulnerability exists in NGINX Plus and NGINX Open Source when a location is configured that uses the alias directive together with rewrite and a set or return directive referencing the $request_filename variable. Alternatively, the same result could be achieved when the $request_filename variable is used in an access log format directive. 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…

    Affected products in this advisory
    • NGINX Plus
    • NGINX Open Source
    Source-reported affected versions
    • NGINX Plus 37.1.0 before 37.1.0.1
    • NGINX Plus 37.0.0 before 37.0.5.1
    • NGINX Plus R36
    • NGINX Plus R35

    4 more entries in the full advisory.

    Source-reported fixed versions
    • 37.1.0.1
    • 37.0.5.1
    • 1.31.7
    • 1.30.6
    Mitigation guidance
    No mitigation guidance extracted; consult the source.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityHigh8.1

    High [CVE-2026-15176] heap-based buffer overflow in ngx_http_core_module via alias with rewrite referencing $request_filename

    CVE-2026-15176Source published Source updated

    heap-based buffer overflow in ngx_http_core_module via alias with rewrite referencing $request_filename. Red Hat rates this important (CVSS 8.1). Weakness: CWE-122. Red Hat lists fixing advisory RHSA-2026:83427 with package nginx-main-1.30.6-1.hum1. Affected products named by the advisory: Red Hat Hardened Images; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; and 1 more.

    Related products — impact not confirmed
    • Red Hat Hardened Images
    • Red Hat Enterprise Linux 10
    • Red Hat Enterprise Linux 8
    • Red Hat Enterprise Linux 9

    1 more entries in the full advisory.

    Source-reported affected versions
    Affected-version details not available in this record.
    Source-reported fixed versions
    • nginx-main-1.30.6-1.hum1
    • RHSA-2026:83427
    Mitigation guidance
    • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
    Full advisory and evidenceOpen source bulletin

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