Vulnerability-Lookup

GHSA-QC2Q-RHVG-9278

Vulnerability from github – Published: 2026-01-13 15:37 – Updated: 2026-01-15 12:30

Details

Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability affects Firefox < 147 and Firefox ESR < 140.7.

Severity ?

8.0 (High)


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

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-0878"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-13T14:16:38Z",
    "severity": "HIGH"
  },
  "details": "Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability affects Firefox \u003c 147 and Firefox ESR \u003c 140.7.",
  "id": "GHSA-qc2q-rhvg-9278",
  "modified": "2026-01-15T12:30:25Z",
  "published": "2026-01-13T15:37:04Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-0878"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2003989"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2026-01"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2026-03"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2026-04"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2026-05"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-0878 (GCVE-0-2026-0878)

Vulnerability from cvelistv5 – Published: 2026-01-13 13:30 – Updated: 2026-01-15 09:31

Title

Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component

Summary

Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

Severity ?

8 (High)


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

CWE

CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-20 - Improper Input Validation

Assigner

mozilla

References

URL

Tags

	https://bugzilla.mozilla.org/show_bug.cgi?id=2003989
	https://www.mozilla.org/security/advisories/mfsa2…
	https://www.mozilla.org/security/advisories/mfsa2…
	https://www.mozilla.org/security/advisories/mfsa2…
	https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

Vendor

Product

Version

Mozilla

Firefox

Affected: unspecified , < 147 (custom)

Mozilla	Firefox ESR	Affected: unspecified , < 140.7 (custom)
Mozilla	Thunderbird	Affected: unspecified , < 147 (custom)
Mozilla	Thunderbird	Affected: unspecified , < 140.7 (custom)

Credits

Oskar L

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "CHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N",
              "version": "3.1"
            }
          },
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            "other": {
              "content": {
                "id": "CVE-2026-0878",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-13T15:40:42.337589Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
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                "cweId": "CWE-119",
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                "type": "CWE"
              }
            ]
          },
          {
            "descriptions": [
              {
                "cweId": "CWE-20",
                "description": "CWE-20 Improper Input Validation",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-13T15:43:10.236Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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    "cna": {
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          "versions": [
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              "status": "affected",
              "version": "unspecified",
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        },
        {
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        },
        {
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          "value": "Oskar L"
        }
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      "descriptions": [
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          "lang": "en",
          "supportingMedia": [
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              "type": "text/html",
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          "value": "Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability affects Firefox \u003c 147, Firefox ESR \u003c 140.7, Thunderbird \u003c 147, and Thunderbird \u003c 140.7."
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      "providerMetadata": {
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          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2003989"
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        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-03/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-04/"
        },
        {
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        }
      ],
      "title": "Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component"
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  "cveMetadata": {
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Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-QC2Q-RHVG-9278

CVE-2026-0878 (GCVE-0-2026-0878)

Tags

Sightings

Nomenclature