CVE-2026-93479: A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and the ro

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HIGH 8.1REMOTEWATCHLIST

CVE-2026-93479 is a high-severity flaw (CVSS 8.1) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 th

Why this priority

High severity
Covered by 3 security sources
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-122
Published	2026-10-14
Last modified	2026-10-15

Publisher (CNA): F5 Networks

Last updated 2026-10-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-10-14 15:17 UTCPublished CVE record published
2026-10-15 11:18 UTCUpdated Record last modified

Exact fixes by distribution

Fedora ELN · edk2 · FIXED · 20260812-12.eln159 · FEDORA-2026-e316b6370a · source

sudo dnf upgrade --advisory=FEDORA-2026-e316b6370a

Fedora 46 · perl-Mojo-DOM58 · FIXED · 3.003-1.fc46 · FEDORA-2026-d5412af3de · source

sudo dnf upgrade --advisory=FEDORA-2026-d5412af3de

Debian 12 · nginx · NO FIX YET

Debian 13 · nginx · FIXED · 1.26.3-3+deb13u10

sudo apt update && sudo apt install --only-upgrade nginx dpkg --compare-versions "$(dpkg-query -W -f='${Version}' nginx)" ge "1.26.3-3+deb13u10" && echo PATCHED || echo STILL-VULNERABLE

RHEL 10 · nginx · DEFERRED

RHEL 8 · nginx:1.24/nginx · NOT AFFECTED

RHEL 9 · nginx · DEFERRED

RHEL 9 · nginx:1.24/nginx · NOT AFFECTED

RHEL 9 · nginx:1.26/nginx · NOT AFFECTED

Alpine 3.24 · nginx · FIXED · nginx-1.30.6-r0

apk add --upgrade nginx apk info -v nginx

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-3263 · source

sudo dnf update --advisory=ALAS2023-2026-3263

Advisories and coverage

Official advisories

Ubuntu Security Notices: USN-8955-1: nginx vulnerabilities 2026-10-26
Amazon Linux 2023 ALAS: ALAS2023-2026-3263 (medium): nginx 2026-10-24
Amazon Linux 2 ALAS: ALAS2NGINX1-2026-017 (medium): nginx 2026-10-24

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-93479?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-93479 being exploited?

CVE-2026-93479 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-93479 affect?

CVE-2026-93479 affects affected software. Severity is high (CVSS 8.1). 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. Alterna

How urgent is CVE-2026-93479?

Priority 57/100. High severity; Covered by 3 security sources; Remotely exploitable, no login, no user action; On your watchlist

Software pages

nginx vulnerabilities

References

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