Catálogo de CVE

CVE-2026-4926

Impact: A bad regular expression is generated any time…

Impact: A bad regular expression is generated any time you have multiple sequential optional groups (curly brace syntax), such as `{a}{b}{c}:z`. The generated regex grows exponentially with the number of groups, causing denial of service. Patches: Fixed in version 8.4.0. Workarounds: Limit the number of sequential optional groups in route patterns. Avoid passing user-controlled input as route patterns.

Gravedad: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Mar 26, 2026, 6:59:38 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.80% · Oct 27, 2026

Projects and upstream resources

[node-path-to-regexp][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / release	Package	Version	Status	Source
Debiansid	node-path-to-regexp	`8.4.0-1`	FixedDistribution-reported fixed boundary	[CVE-2026-4926]
Debiansid	node-path-to-regexp	`8.4.2-1`	Fixed	[CVE-2026-4926]
Debianforky	node-path-to-regexp	`8.4.0-1`	FixedDistribution-reported fixed boundary	[CVE-2026-4926]
Debianforky	node-path-to-regexp	`8.4.2-1`	Fixed	[CVE-2026-4926]

Showing 4 fix observations. All 10 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
UnknownRelease not reported	node-path-to-regexp	Not reported	UnknownSource applicability is not established	Provider not reported
UnknownRelease not reported	path-to-regexp	`8.4.0`	UnknownSource applicability is not established	Provider not reported
Debianbookworm	node-path-to-regexp	Not reported	AffectedDistribution reports no fix	[CVE-2026-4926]
Debianbookworm	node-path-to-regexp	`6.2.1-1`	Affected	[CVE-2026-4926]
Debianforky	node-path-to-regexp	`8.4.0-1`	FixedDistribution-reported fixed boundary	[CVE-2026-4926]
Debianforky	node-path-to-regexp	`8.4.2-1`	Fixed	[CVE-2026-4926]
Debiansid	node-path-to-regexp	`8.4.0-1`	FixedDistribution-reported fixed boundary	[CVE-2026-4926]
Debiansid	node-path-to-regexp	`8.4.2-1`	Fixed	[CVE-2026-4926]
Debiantrixie	node-path-to-regexp	Not reported	AffectedDistribution reports no fix	[CVE-2026-4926]
Debiantrixie	node-path-to-regexp	`6.3.0-1`	Affected	[CVE-2026-4926]

Original provider fields

{
  "package_releases": [
    {
      "name": "node-path-to-regexp",
      "status": "fixed",
      "release": "sid",
      "version": "8.4.2-1"
    },
    {
      "name": "node-path-to-regexp",
      "status": "fixed",
      "release": "forky",
      "version": "8.4.2-1"
    },
    {
      "name": "node-path-to-regexp",
      "status": "vulnerable",
      "release": "trixie",
      "version": "6.3.0-1"
    },
    {
      "name": "node-path-to-regexp",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "6.2.1-1"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1132020,
      "name": "node-path-to-regexp",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "8.4.0-1"
    },
    {
      "bug": 1132020,
      "name": "node-path-to-regexp",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "8.4.0-1"
    },
    {
      "bug": 1132020,
      "name": "node-path-to-regexp",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1132020,
      "name": "node-path-to-regexp",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "node-path-to-regexp",
      "fixed_version": "not yet fixed",
      "applicability_unknown": true
    },
    {
      "name": "path-to-regexp",
      "fixed_version": "8.4.0",
      "applicability_unknown": true
    },
    {
      "name": "path-to-regexp",
      "ranges": [
        {
          "fixed": "8.4.0",
          "introduced": "8.0.0",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4926",
      "fixed_version": "8.4.0",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2026-4926",
      "provider_updated_at": "2026-09-09T13:20:25.320"
    }
  ]
}

[Debian bug #1132020]

Publisher notes

[trixie] node-path-to-regexp: Minor issue [bookworm] node-path-to-regexp: Minor issue

OpenFactory catalog packages

La asociación de paquetes está en curso.

[Debian 12 (Bookworm)]

[node-path-to-regexp]Desconocido
Detalles (2)
- 6.2.1-1 · all · bookworm
  Afectada
  nvd · node-path-to-regexp · debian · bookworm; nvd · node-path-to-regexp · debian · 12
- 6.2.1-1 · all · bookworm
  Afectada
  nvd · node-path-to-regexp · debian · bookworm; nvd · node-path-to-regexp · debian · 12

[Debian 13 (Trixie)]

[node-path-to-regexp]Desconocido
Detalles (2)
- 6.3.0-1 · all · trixie
  Afectada
  nvd · node-path-to-regexp · debian · 13
- 6.3.0-1 · all · trixie
  Afectada
  nvd · node-path-to-regexp · debian · 13

Observado: Oct 23, 2026, 10:36:29 PM UTC

Referencias

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]