Vulnerability-Lookup

CVE-2026-2327 (GCVE-0-2026-2327)

Vulnerability from cvelistv5 – Published: 2026-02-12 05:00 – Updated: 2026-02-12 14:41

Summary

Versions of the package markdown-it from 13.0.0 and before 14.1.1 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the use of the regex /\*+$/ in the linkify function. An attacker can supply a long sequence of * characters followed by a non-matching character, which triggers excessive backtracking and may lead to a denial-of-service condition.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-02-12 14:41 UTC

CWE

CWE-1333 - Regular Expression Denial of Service (ReDoS)

Assigner

snyk mitre root

References

4 references

URL	Tags
https://security.snyk.io/vuln/SNYK-JS-MARKDOWNIT-…
https://gist.github.com/ltduc147/c9abecae1b291ede…
https://github.com/markdown-it/markdown-it/blob/1…
https://github.com/markdown-it/markdown-it/commit…

Impacted products

1 product

Vendor	Product	Version	CPE status
n/a	markdown-it	Affected: 13.0.0 , < 14.1.1 (semver)

Credits

Duc Le Trung

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-2327",
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          "url": "https://github.com/markdown-it/markdown-it/commit/4b4bbcae5e0990a5b172378e507b33a59012ed26"
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Un atacante puede proporcionar una secuencia larga de caracteres * seguida de un car\u00e1cter no coincidente, lo que desencadena un retroceso excesivo y puede conducir a una condici\u00f3n de denegaci\u00f3n de servicio.\"}],\"affected\":[{\"source\":\"report@snyk.io\",\"affectedData\":[{\"vendor\":\"n/a\",\"product\":\"markdown-it\",\"versions\":[{\"version\":\"13.0.0\",\"lessThan\":\"14.1.1\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"report@snyk.io\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/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\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"LOW\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"PROOF_OF_CONCEPT\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"cvssMetricV31\":[{\"source\":\"report@snyk.io\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L\",\"baseScore\":5.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":3.9,\"impactScore\":1.4},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-02-12T14:41:31.205349Z\",\"id\":\"CVE-2026-2327\",\"options\":[{\"exploitation\":\"poc\"},{\"automatable\":\"yes\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"report@snyk.io\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-1333\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:markdown-it_project:markdown-it:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"13.0.0\",\"versionEndExcluding\":\"14.1.1\",\"matchCriteriaId\":\"20B951B3-39A2-4AFA-93E7-D2A42D6C5535\"}]}]}],\"references\":[{\"url\":\"https://gist.github.com/ltduc147/c9abecae1b291ede4f692f2ab988c917\",\"source\":\"report@snyk.io\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://github.com/markdown-it/markdown-it/blob/14.1.0/lib/rules_inline/linkify.mjs%23L33\",\"source\":\"report@snyk.io\",\"tags\":[\"Broken Link\"]},{\"url\":\"https://github.com/markdown-it/markdown-it/commit/4b4bbcae5e0990a5b172378e507b33a59012ed26\",\"source\":\"report@snyk.io\",\"tags\":[\"Patch\",\"Product\"]},{\"url\":\"https://security.snyk.io/vuln/SNYK-JS-MARKDOWNIT-10666750\",\"source\":\"report@snyk.io\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://gist.github.com/ltduc147/c9abecae1b291ede4f692f2ab988c917\",\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://security.snyk.io/vuln/SNYK-JS-MARKDOWNIT-10666750\",\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"tags\":[\"Third Party Advisory\"]}]}}",
    "redhat_vex": {
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      "cve": "CVE-2026-2327",
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      "product_status:fixed": "4",
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      "status": "final",
      "title": "markdown-it: markdown-it: Denial of Service via Regular Expression Denial of Service in linkify function",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2327.json",
      "version": "3"
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      "product_status:known_not_affected": "169",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-2327",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-2327.json",
      "version": "5"
    },
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GHSA-38C4-R59V-3VQW

Vulnerability from github – Published: 2026-02-12 06:30 – Updated: 2026-02-13 20:04

Summary

markdown-it is has a Regular Expression Denial of Service (ReDoS)

Details

Versions of the package markdown-it from 13.0.0 and before 14.1.1 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the use of the regex /*+$/ in the linkify function. An attacker can supply a long sequence of * characters followed by a non-matching character, which triggers excessive backtracking and may lead to a denial-of-service condition.

Severity

5.3 (Medium)


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

5.5 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "markdown-it"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "13.0.0"
            },
            {
              "fixed": "14.1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-2327"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1333"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-13T20:04:39Z",
    "nvd_published_at": "2026-02-12T06:16:02Z",
    "severity": "MODERATE"
  },
  "details": "Versions of the package markdown-it from 13.0.0 and before 14.1.1 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the use of the regex /\\*+$/ in the linkify function. An attacker can supply a long sequence of * characters followed by a non-matching character, which triggers excessive backtracking and may lead to a denial-of-service condition.",
  "id": "GHSA-38c4-r59v-3vqw",
  "modified": "2026-02-13T20:04:39Z",
  "published": "2026-02-12T06:30:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2327"
    },
    {
      "type": "WEB",
      "url": "https://github.com/markdown-it/markdown-it/commit/4b4bbcae5e0990a5b172378e507b33a59012ed26"
    },
    {
      "type": "WEB",
      "url": "https://gist.github.com/ltduc147/c9abecae1b291ede4f692f2ab988c917"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/markdown-it/markdown-it"
    },
    {
      "type": "WEB",
      "url": "https://github.com/markdown-it/markdown-it/blob/14.1.0/lib/rules_inline/linkify.mjs#L33"
    },
    {
      "type": "WEB",
      "url": "https://security.snyk.io/vuln/SNYK-JS-MARKDOWNIT-10666750"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "markdown-it is has a Regular Expression Denial of Service (ReDoS)"
}

RHSA-2026:21772

Vulnerability from csaf_redhat - Published: 2026-05-28 21:29 - Updated: 2026-09-16 18:27

Summary

Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.28.0 Release.

Severity

Important

Scope

39 vulnerabilities in this advisory, including CVE-2026-2327.

CVE-2026-2327

A flaw was found in markdown-it. A remote attacker can exploit this Regular Expression Denial of Service (ReDoS) vulnerability by providing a specially crafted input containing a long sequence of asterisk characters followed by a non-matching character to the `linkify` function. This triggers excessive backtracking in the regular expression, leading to a denial-of-service condition.

7.5 (High)


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

Fixed: 4 products Known not affected: 57 products

https://access.redhat.com/errata/RHSA-2026:21772

Open the full advisory

ubuntu-cve-2026-2327

Vulnerability from osv_ubuntu

Published

2026-02-12 06:16

Modified

2026-05-20 15:24

Summary

Details

Severity

5.3 (Medium)


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

7.5 (High)


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

5.5 (Medium)


                    
                      CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-2327	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-2327	REPORT
	https://gist.github.com/ltduc147/c9abecae1b291ede…	REPORT
	https://github.com/markdown-it/markdown-it/blob/1…	REPORT
	https://github.com/markdown-it/markdown-it/commit…	REPORT
	https://security.snyk.io/vuln/SNYK-JS-MARKDOWNIT-…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-markdown-it",
            "binary_version": "10.0.0+dfsg-6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "node-markdown-it",
        "purl": "pkg:deb/ubuntu/node-markdown-it@10.0.0+dfsg-6?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "10.0.0+dfsg-2",
        "10.0.0+dfsg-3",
        "10.0.0+dfsg-3.1",
        "10.0.0+dfsg-4",
        "10.0.0+dfsg-5",
        "10.0.0+dfsg-6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-markdown-it",
            "binary_version": "22.2.3+dfsg+~12.2.3-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "node-markdown-it",
        "purl": "pkg:deb/ubuntu/node-markdown-it@22.2.3+dfsg+~12.2.3-2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "22.2.3+dfsg+~12.2.3-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-markdown-it",
            "binary_version": "22.2.3+dfsg+~12.2.3-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "node-markdown-it",
        "purl": "pkg:deb/ubuntu/node-markdown-it@22.2.3+dfsg+~12.2.3-2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "22.2.3+dfsg+~12.2.3-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-markdown-it",
            "binary_version": "22.2.3+dfsg+~12.2.3-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "node-markdown-it",
        "purl": "pkg:deb/ubuntu/node-markdown-it@22.2.3+dfsg+~12.2.3-4?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "22.2.3+dfsg+~12.2.3-2",
        "22.2.3+dfsg+~12.2.3-4"
      ]
    }
  ],
  "aliases": [],
  "details": "Versions of the package markdown-it from 13.0.0 and before 14.1.1 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the use of the regex /\\*+$/ in the linkify function. An attacker can supply a long sequence of * characters followed by a non-matching character, which triggers excessive backtracking and may lead to a denial-of-service condition.",
  "id": "UBUNTU-CVE-2026-2327",
  "modified": "2026-05-20T15:24:28Z",
  "published": "2026-02-12T06:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-2327"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-2327"
    },
    {
      "type": "REPORT",
      "url": "https://gist.github.com/ltduc147/c9abecae1b291ede4f692f2ab988c917"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/markdown-it/markdown-it/blob/14.1.0/lib/rules_inline/linkify.mjs%23L33"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/markdown-it/markdown-it/commit/4b4bbcae5e0990a5b172378e507b33a59012ed26"
    },
    {
      "type": "REPORT",
      "url": "https://security.snyk.io/vuln/SNYK-JS-MARKDOWNIT-10666750"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-2327"
  ]
}

WID-SEC-W-2026-0574

Vulnerability from csaf_certbund - Published: 2026-03-02 23:00 - Updated: 2026-03-03 23:00

Summary

IBM App Connect Enterprise: Mehrere Schwachstellen

Severity

Mittel

Scope

7 vulnerabilities in this advisory, including CVE-2026-2327.

CVE-2026-2327

Known affected: 1 product

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-2327 (GCVE-0-2026-2327)

GHSA-38C4-R59V-3VQW

RHSA-2026:21772

ubuntu-cve-2026-2327

Vulnerability from osv_ubuntu

WID-SEC-W-2026-0574

Tags

Sightings

Nomenclature

Related by attack behaviour