CVE-2026-93479CriticalNetwork

NGINX Map directive and Regex matching vulnerability

MSRC advisory NVD CVE.org

Assessment

Severity: Critical
CVSS base score: 8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact: Not stated
EPSS, next 30 days: Not scored yet
Public exploit code: No Nuclei template lists it
Exploitability: Not assessed
Publicly disclosed: No
Customer action: Required: apply the update
Component: Mariner
Weakness: CWE-122: Heap-based Buffer Overflow
Issued by: f5
Published: 17 Oct 2026 · October 2026
Last revised: 17 Oct 2026

CVSS 3.1 base metricsRed raises the risk · green lowers it

Attack vector: NetworkAV:N
Attack complexity: HighAC:H
Privileges required: NonePR:N
User interaction: NoneUI:N
Scope: UnchangedS:U
Confidentiality: HighC:H
Integrity: HighI:H
Availability: HighA:H

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

1 affected product

azl3 nginx 1.30.4-1 on Azure Linux 3.0

What changed

First observed 17 Oct 2026

26 Oct 2026 · 07:26:10 UTC Affected productsazl3 httpd 2.4.68-1 on Azure Linux 3.0 → azl3 nginx 1.30.4-1 on Azure Linux 3.0
23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
23 Oct 2026 · 08:31:50 UTC Source coverage: first-epssCurrent → Incomplete
23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete

Show 2 more recent changes

23 Oct 2026 · 08:31:50 UTCSource coverage: msrc-cvrf Current → Incomplete
18 Oct 2026 · 14:54:30 UTCLink: October 2026 → /security?release=2026-Oct#cves

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Explore global source statements, affected packages and advisory history for CVE-2026-93479. The catalog has a separate collection scope from Microsoft release records.

cve-program · CVE-2026-93479

Published

NGINX Plus

Vendor product

Original vendor version evidence · not evaluated as a NuGet range

{
                    "vendor": "F5",
                    "product": "NGINX Plus",
                    "modules": [
                        "The map directive with regex matching"
                    ],
                    "versions": [
                        {
                            "status": "affected",
                            "version": "37.1.0",
                            "lessThan": "37.1.0.1",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "37.0.0",
                            "lessThan": "37.0.5.1",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "R36",
                            "lessThan": "*",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "R35",
                            "lessThan": "*",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "R34",
                            "lessThan": "*",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "R33",
                            "lessThan": "*",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unknown"
                }

NGINX Open Source

Vendor product

Original vendor version evidence · not evaluated as a NuGet range

{
                    "vendor": "F5",
                    "product": "NGINX Open Source",
                    "modules": [
                        "The map directive with regex matching"
                    ],
                    "versions": [
                        {
                            "status": "affected",
                            "version": "1.31.2",
                            "lessThan": "1.31.7",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "1.30.0",
                            "lessThan": "1.30.6",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }