FKIE_CVE-2026-6749

Vulnerability from fkie_nvd - Published: 2026-04-21 13:16 - Updated: 2026-04-22 14:52
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Summary
Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
References
security@mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=2022610Permissions Required
security@mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-30/Vendor Advisory
security@mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-31/Vendor Advisory
security@mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-32/Vendor Advisory
security@mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-33/Vendor Advisory
security@mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-34/Vendor Advisory
Impacted products
Vendor Product Version
mozilla firefox *
mozilla firefox *
mozilla firefox *
mozilla thunderbird *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*",
              "matchCriteriaId": "E69D71F5-CAAA-4F28-AB9F-9F898A52D506",
              "versionEndExcluding": "115.35.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*",
              "matchCriteriaId": "67B01D49-66FA-4C76-9EB4-2B8CD61FBEB2",
              "versionEndExcluding": "150.0",
              "vulnerable": true
            },
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              "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*",
              "matchCriteriaId": "528443E0-C15A-4E70-9187-8E1BAAE84A42",
              "versionEndExcluding": "140.10.0",
              "versionStartIncluding": "140.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*",
              "matchCriteriaId": "48217E2F-FFD3-4385-B962-15365B293DA7",
              "versionEndExcluding": "140.10.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10."
    }
  ],
  "id": "CVE-2026-6749",
  "lastModified": "2026-04-22T14:52:10.453",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-21T13:16:20.993",
  "references": [
    {
      "source": "security@mozilla.org",
      "tags": [
        "Permissions Required"
      ],
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2022610"
    },
    {
      "source": "security@mozilla.org",
      "tags": [
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      "url": "https://www.mozilla.org/security/advisories/mfsa2026-30/"
    },
    {
      "source": "security@mozilla.org",
      "tags": [
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      "url": "https://www.mozilla.org/security/advisories/mfsa2026-31/"
    },
    {
      "source": "security@mozilla.org",
      "tags": [
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      ],
      "url": "https://www.mozilla.org/security/advisories/mfsa2026-32/"
    },
    {
      "source": "security@mozilla.org",
      "tags": [
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      ],
      "url": "https://www.mozilla.org/security/advisories/mfsa2026-33/"
    },
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      "source": "security@mozilla.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.mozilla.org/security/advisories/mfsa2026-34/"
    }
  ],
  "sourceIdentifier": "security@mozilla.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-908"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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