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CVE-2025-6493

Status: DeferredMedium (5.5)—

A weakness has been identified in CodeMirror up to 5.65.20. Affected is an unknown function of the file mode/markdown/markdown.js of the component Markdown Mode. This manipulation causes inefficient regular expression complexity. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be exploited. Upgrading to version 6.0 is able to address this issue. You should upgrade the affected component. Not all code samples mentioned in the GitHub issue can be found. The repository mentions, that "CodeMirror 6 exists, and is [...] much more actively maintained."

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Codemirror — CodemirrorAI

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2025-6493",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-6493",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
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          ],
          "version": "2.0.3",
          "timestamp": "2025-06-23T15:43:06.172562Z"
        }
      }
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    "cvssMetricV2": [
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          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
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        "type": "Secondary",
        "source": "cna@vuldb.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
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          "confidentialityImpact": "NONE"
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        "exploitabilityScore": 3.9
      }
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    "cvssMetricV40": [
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        "type": "Secondary",
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        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 5.5,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "valueDensity": "NOT_DEFINED",
          "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",
          "exploitMaturity": "PROOF_OF_CONCEPT",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "NONE",
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          "privilegesRequired": "NONE",
          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "LOW",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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  },
  "affected": [
    {
      "source": "cna@vuldb.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "modules": [
            "Markdown Mode"
          ],
          "product": "CodeMirror",
          "versions": [
            {
              "status": "affected",
              "version": "5.65.0"
            },
            {
              "status": "affected",
              "version": "5.65.1"
            },
            {
              "status": "affected",
              "version": "5.65.2"
            },
            {
              "status": "affected",
              "version": "5.65.3"
            },
            {
              "status": "affected",
              "version": "5.65.4"
            },
            {
              "status": "affected",
              "version": "5.65.5"
            },
            {
              "status": "affected",
              "version": "5.65.6"
            },
            {
              "status": "affected",
              "version": "5.65.7"
            },
            {
              "status": "affected",
              "version": "5.65.8"
            },
            {
              "status": "affected",
              "version": "5.65.9"
            },
            {
              "status": "affected",
              "version": "5.65.10"
            },
            {
              "status": "affected",
              "version": "5.65.11"
            },
            {
              "status": "affected",
              "version": "5.65.12"
            },
            {
              "status": "affected",
              "version": "5.65.13"
            },
            {
              "status": "affected",
              "version": "5.65.14"
            },
            {
              "status": "affected",
              "version": "5.65.15"
            },
            {
              "status": "affected",
              "version": "5.65.16"
            },
            {
              "status": "affected",
              "version": "5.65.17"
            },
            {
              "status": "affected",
              "version": "5.65.18"
            },
            {
              "status": "affected",
              "version": "5.65.19"
            },
            {
              "status": "affected",
              "version": "5.65.20"
            },
            {
              "status": "unaffected",
              "version": "6.0"
            }
          ]
        }
      ]
    }
  ],
  "published": "2025-06-22T22:15:22.430",
  "references": [
    {
      "url": "https://github.com/codemirror/codemirror5/issues/7128",
      "source": "cna@vuldb.com"
    },
    {
      "url": "https://vuldb.com/?ctiid.313610",
      "source": "cna@vuldb.com"
    },
    {
      "url": "https://vuldb.com/?id.313610",
      "source": "cna@vuldb.com"
    },
    {
      "url": "https://vuldb.com/?submit.598875",
      "source": "cna@vuldb.com"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "cna@vuldb.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        },
        {
          "lang": "en",
          "value": "CWE-1333"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A weakness has been identified in CodeMirror up to 5.65.20. Affected is an unknown function of the file mode/markdown/markdown.js of the component Markdown Mode. This manipulation causes inefficient regular expression complexity. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be exploited. Upgrading to version 6.0 is able to address this issue. You should upgrade the affected component. Not all code samples mentioned in the GitHub issue can be found. The repository mentions, that \"CodeMirror 6 exists, and is [...] much more actively maintained.\""
    },
    {
      "lang": "es",
      "value": "Se encontró una vulnerabilidad en CodeMirror hasta la versión 5.17.0 y se clasificó como problemática. Este problema afecta a una funcionalidad desconocida del archivo mode/markdown/markdown.js del componente Markdown Mode. La manipulación genera una complejidad ineficiente en las expresiones regulares. El ataque puede ejecutarse en remoto. Se ha hecho público el exploit y puede que sea utilizado. No se pueden encontrar todos los ejemplos de código mencionados en el problema de GitHub. El repositorio menciona que «CodeMirror 6 existe y se mantiene de forma mucho más activa»."
    }
  ],
  "lastModified": "2026-06-17T10:02:00.770",
  "sourceIdentifier": "cna@vuldb.com"
}