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Fencer Vulns
high 8.1

CVE-2026-93479 json

NGINX map directive and regex matching vulnerability

published 2026-10-14 25 d ago modified 2026-10-29 10 d ago also BIT-nginx-2026-93479 , BIT-nginx-gateway-2026-93479 , EUVD-2026-101114

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami nginx 1.30.6, 1.31.7
  • bitnami nginx-gateway 1.30.6, 1.31.7
  • F5 NGINX Plus 37.0.5.1, 37.1.0.1
  • F5 NGINX Open Source 1.30.6, 1.31.7
  • nginx Debian 13 1.26.3-3+deb13u10
  • nginx Debian 14 1.30.4-8

debian advisories DEBIAN-CVE-2026-93479

  • nginx Ubuntu 22.04 LTS 1.18.0-6ubuntu14.22
  • nginx Ubuntu 24.04 LTS 1.24.0-2ubuntu7.19
  • nginx Ubuntu 26.10 1.30.4-7ubuntu1.1
  • nginx Ubuntu 26.04 LTS 1.28.3-2ubuntu1.12
  • nginx Ubuntu Pro 14.04 LTS 1.4.6-1ubuntu3.9+esm9
  • nginx Ubuntu Pro 16.04 LTS 1.10.3-0ubuntu0.16.04.5+esm10
  • nginx Ubuntu Pro 18.04 LTS 1.14.0-0ubuntu1.11+esm5
  • nginx Ubuntu Pro 20.04 LTS 1.18.0-0ubuntu1.7+esm4

ubuntu advisories UBUNTU-CVE-2026-93479

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nginx openSUSE Tumbleweed 1.31.7-1.1

opensuse advisories openSUSE-SU-2026:12143-1

  • nginx Alpine 3.24 1.30.6-r0

alpine advisories ALPINE-CVE-2026-93479

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nginx Azure Linux 3.0 1.30.6-1

azure linux advisories AZL-108461

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-93479 updated cvss 7.0

nginx: NGINX map directive and regex matching vulnerability

  • Red Hat Enterprise Linux 9 nginx, nginx-core, nginx-mod-mail, nginx-filesystem, nginx-mod-stream, nginx-all-modules, +3 more Red Hat Enterprise Linux 10 nginx
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 8 nginx, nginx-mod-mail, nginx-filesystem, nginx-mod-stream, nginx-all-modules, nginx-mod-http-perl, +2 more Red Hat Enterprise Linux 9 nginx, nginx-core, nginx-mod-mail, nginx-filesystem, nginx-mod-stream, nginx-all-modules, +3 more Red Hat Hardened Images nginx
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
24 d ago

Exploit prediction

1.20% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 4.0 9.2 CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA 4.0 9.2 CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
bitnami nginx
>=1.30.0, <1.30.6
>=1.31.2, <1.31.7
1.30.6
1.31.7
bitnami nginx-gateway
>=1.30.0, <1.30.6
>=1.31.2, <1.31.7
1.30.6
1.31.7

Affected products

  • F5 NGINX Plus
  • F5 NGINX Open Source

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.