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Vulnerabilities

Vulnerability · CVE-2026-93479

NGINX map directive and regex matching vulnerability

Published Oct 14, 2026 · catalog updated Oct 18, 2026 · F5 NGINX Plus

Check if you run it

No confirmed exploitation is on record for CVE-2026-93479. EPSS is 0.55%. Act only if a listed version of F5 NGINX Plus is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.55%
Remediation
Advisory link
Affected products
Debian:12 nginx · Debian:13 nginx · Debian:14 nginx · vendor F5 NGINX Open Source · vendor F5 NGINX Plus

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 nginx1.22.1-9, 1.22.1-9+deb12u1, 1.22.1-9+deb12u10
  • Debian:13 nginx1.26.3-3, 1.26.3-3+deb13u1, 1.26.3-3+deb13u2
  • Debian:14 nginx0 → 1.30.4-8
  • vendor F5 NGINX Open Sourceversion unspecified
  • vendor F5 NGINX Plusversion unspecified

How to fix CVE-2026-93479

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-93479. EPSS is 0.55%. Act only if a listed version of F5 NGINX Plus is installed.

Which versions are affected?

Compare what you have installed with 1.22.1-9, 1.22.1-9+deb12u1, 1.22.1-9+deb12u10, 1.26.3-3, 1.26.3-3+deb13u1, 1.26.3-3+deb13u2, 0 → 1.30.4-8. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-122: Heap-based Buffer Overflow. EPSS 0.55%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian securityNginx security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 14, 2026 · NIST NVD

    Detected

    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 w

  2. Oct 14, 2026 · NIST NVD

    Updated

    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 w

  3. Oct 15, 2026 · NIST NVD

    Updated

    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 w

  4. Oct 15, 2026 · NIST NVD

    Updated

    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 w

  5. Oct 18, 2026 · Trivy Vulnerability DB

    Fix available

    nginx fixed in 1.30.4-8

  6. Oct 18, 2026 · Trivy Vulnerability DB

    Fix available

    nginx fixed in 1.30.4-8

  7. Oct 18, 2026 · Trivy Vulnerability DB

    Updated

    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 w

Sources

  • CIRCL Vulnerability LookupVulnerability recordCVE-2026-93479

    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 achieve

    vulnerability.circl.lu
  • CVE.orgVulnerability recordCVE-2026-93479

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-93479

    30-day exploitation probability 0.6%

    first.org
  • NIST NVDVulnerability recordCVE-2026-93479

    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 achieve

    nvd.nist.gov
  • OpenSSF OSV / OSV ScannerPackage advisoryDEBIAN-CVE-2026-93479
    osv.dev
  • Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-93479

    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 achieve

    osv.dev

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.