Is CVE-2026-4923 in the CISA KEV catalog?

No. CVE-2026-4923 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-4923?

CVE-2026-4923 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2026-4923?

CVE-2026-4923 has an EPSS score of 0.35% (27th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-4923?

Upgrade node-path-to-regexp on debian unstable to 8.4.0-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2026-4923

MEDIUM

5.9

CVSS v3

NVD

Description

Impact: When using multiple wildcards, combined with at least one parameter, a regular expression can be generated that is vulnerable to ReDoS. This backtracking vulnerability requires the second wildcard to be somewhere other than the end of the path. Unsafe examples: /*foo-*bar-:baz /*a-:b-*c-:d /x/*a-:b/*c/y Safe examples: /*foo-:bar /*foo-:bar-*baz Patches: Upgrade to version 8.4.0. Workarounds: If you are using multiple wildcard parameters, you can check the regex output with a tool such as https://makenowjust-labs.github.io/recheck/playground/ to confirm whether a path is vulnerable.

CWE-1333

How to fix

Remediation Available

node-path-to-regexpDebian

Fixed in:8.4.0-1CVE-2026-4923

registry.redhat.io/rhdh/rhdhRed Hat / RHEL

Fixed in:hub-rhel9@sha256:b99622b2ec913bdf7ad25a7a9919fbf07a6a177548b3f486acf648c533ca4f22_amd64RHSA-2026:24841

Fixed in:rhel9-operator@sha256:c290c8d9d433286ac038022c229b359500b7451a3d3f97c3c50371b6198df029_amd64RHSA-2026:24841

Fixed in:operator-bundle@sha256:b04577fd53315437ef4580af92055fb5238649a5a11e68e264ea1ed70eae79db_amd64RHSA-2026:24841

registry.redhat.io/rhdh/rhdhRocky

Fixed in:hub-rhel9@sha256:b99622b2ec913bdf7ad25a7a9919fbf07a6a177548b3f486acf648c533ca4f22_amd64RHSA-2026:24841

Fixed in:rhel9-operator@sha256:c290c8d9d433286ac038022c229b359500b7451a3d3f97c3c50371b6198df029_amd64RHSA-2026:24841

Fixed in:operator-bundle@sha256:b04577fd53315437ef4580af92055fb5238649a5a11e68e264ea1ed70eae79db_amd64RHSA-2026:24841

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

0.35%probability of exploitation in 30 days

27thpercentile

Low risk: more likely to be exploited than 27% of all known CVEs.

References

Third-Party Advisory1

cna.openjsf.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-16.