5.9

CVE-2026-4923: path-to-regexp

CVSS: 5.9v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-4923DEBIAN-CVE-2026-4923CGA-2c79-g5q9-2p6w
Published 26-03-2026Last modified 27-03-2026
Open JSON

Vulnerability summary

CVE-2026-4923 is a medium (CVSS 5.9) vulnerability in path-to-regexp. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 29.5% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
5.9/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.37%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-VHGQ-R233-PW87

Timeline

  1. 26-03-2026
    PublishedVulnerability first disclosed.
  2. 27-03-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.37%

Chance of exploitation in the next 30 days

Percentile

30%

Versus all other CVEs

30-day change

+0.02 pp

From 0.35% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.37%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard23 products
  • code-server< 4.112.0-r2
  • gemini-cli< 0.35.3-r0
  • kibana-9.1< 9.1.10-r12
  • kibana-9.1-iamguarded< 9.1.10-r12
  • kibana-9.2< 9.2.7-r5
Wolfi8 products
  • code-server< 4.112.0-r2
  • langfuse-3-compat< 3.225.7-r6
  • langfuse-3-worker< 3.179.1-r3
  • saf< 1.6.0-r0
  • thingsboard-tb-js-executor< 4.3.1.1-r0
Debian1 product
  • node-path-to-regexpAll versions (No fix recorded) | < 8.4.0-1
Npm1 product
  • path-to-regexp≥ 8.0.0, < 8.4.0
Path-to-regexp1 product
Pillarjs1 product
Ubuntu1 product
  • node-path-to-regexpAll versions (No fix recorded)

7 vendors · 36 products

References

9 links