CVE-2026-114501 (GCVE-0-2026-114501)

Vulnerability from cvelistv5 – Published: 2026-10-21 21:17 – Updated: 2026-10-21 21:17
VLAI
Title
Pillow: Arrow export leaks stale heap memory when PILLOW_ALIGNMENT > 1
Summary
Pillow is a Python imaging library. From 11.2.1 until 13.0.0, Arrow export assumes that an image's rows are tightly contiguous and exports from im->blocks[0].ptr even when PILLOW_ALIGNMENT makes aligned_linesize include row padding or an aligned offset before the first row. The resulting Arrow buffer can include uninitialized padding, bytes preceding the first row, or stale heap contents from previously freed images. Applications that configure alignment and export images to Arrow can therefore disclose one user's pixels or other process memory to another user. This issue is fixed in version 13.0.0.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-226 - Sensitive Information in Resource Not Removed Before Reuse
  • CWE-908 - Use of Uninitialized Resource
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7734 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
python-pillow Pillow Affected: >= 11.2.1, < 13.0.0
guessed Create a notification for this product.
Show details on NVD website
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          "vendor": "python-pillow",
          "versions": [
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          "value": "Pillow is a Python imaging library. From 11.2.1 until 13.0.0, Arrow export assumes that an image\u0027s rows are tightly contiguous and exports from im-\u003eblocks[0].ptr even when PILLOW_ALIGNMENT makes aligned_linesize include row padding or an aligned offset before the first row. The resulting Arrow buffer can include uninitialized padding, bytes preceding the first row, or stale heap contents from previously freed images. Applications that configure alignment and export images to Arrow can therefore disclose one user\u0027s pixels or other process memory to another user. This issue is fixed in version 13.0.0."
        }
      ],
      "metrics": [
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            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
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            "vulnIntegrityImpact": "NONE"
          }
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      "problemTypes": [
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          "descriptions": [
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              "type": "CWE"
            }
          ]
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        {
          "descriptions": [
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              "description": "CWE-908: Use of Uninitialized Resource",
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            }
          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T21:17:09.748Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
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        {
          "name": "https://github.com/python-pillow/Pillow/security/advisories/GHSA-654x-cwwv-5j9c",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/python-pillow/Pillow/security/advisories/GHSA-654x-cwwv-5j9c"
        },
        {
          "name": "https://github.com/python-pillow/Pillow/pull/10172",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/python-pillow/Pillow/pull/10172"
        },
        {
          "name": "https://github.com/python-pillow/Pillow/commit/19f64946eb247b973dd4560be7dea3bf979d2e6a",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/python-pillow/Pillow/commit/19f64946eb247b973dd4560be7dea3bf979d2e6a"
        },
        {
          "name": "https://github.com/python-pillow/Pillow/releases/tag/13.0.0",
          "tags": [
            "x_refsource_MISC"
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          "url": "https://github.com/python-pillow/Pillow/releases/tag/13.0.0"
        }
      ],
      "source": {
        "advisory": "GHSA-654x-cwwv-5j9c",
        "discovery": "UNKNOWN"
      },
      "title": "Pillow: Arrow export leaks stale heap memory when PILLOW_ALIGNMENT \u003e 1"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-114501",
    "datePublished": "2026-10-21T21:17:09.748Z",
    "dateReserved": "2026-10-21T16:15:06.491Z",
    "dateUpdated": "2026-10-21T21:17:09.748Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-10-23",
      "epss": "0.00384",
      "percentile": "0.31246"
    },
    "nvd": {
      "cve": {
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            "affectedData": [
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                "product": "Pillow",
                "vendor": "python-pillow",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003e= 11.2.1, \u003c 13.0.0"
                  }
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            "source": "security-advisories@github.com"
          }
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Pillow is a Python imaging library. From 11.2.1 until 13.0.0, Arrow export assumes that an image\u0027s rows are tightly contiguous and exports from im-\u003eblocks[0].ptr even when PILLOW_ALIGNMENT makes aligned_linesize include row padding or an aligned offset before the first row. The resulting Arrow buffer can include uninitialized padding, bytes preceding the first row, or stale heap contents from previously freed images. Applications that configure alignment and export images to Arrow can therefore disclose one user\u0027s pixels or other process memory to another user. This issue is fixed in version 13.0.0."
          }
        ],
        "id": "CVE-2026-114501",
        "lastModified": "2026-10-22T16:46:48.920",
        "metrics": {
          "cvssMetricV40": [
            {
              "cvssData": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "availabilityRequirement": "NOT_DEFINED",
                "baseScore": 6.3,
                "baseSeverity": "MEDIUM",
                "confidentialityRequirement": "NOT_DEFINED",
                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/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",
                "version": "4.0",
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                "vulnIntegrityImpact": "NONE",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
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              "type": "Secondary"
            }
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        "published": "2026-10-21T22:16:49.410",
        "references": [
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            "url": "https://github.com/python-pillow/Pillow/releases/tag/13.0.0"
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          }
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        "vulnStatus": "Undergoing Analysis",
        "weaknesses": [
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              {
                "lang": "en",
                "value": "CWE-908"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-10-22T21:20:36+00:00",
      "cve": "CVE-2026-114501",
      "id": "CVE-2026-114501",
      "initial_release_date": "2026-10-21T21:17:09.748000+00:00",
      "product_status:known_affected": "94",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "pillow: Pillow: Information disclosure via improper memory alignment during Arrow export",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-114501.json",
      "version": "3"
    }
  }
}



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