CVE-2026-114501

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Source
https://cve.org/CVERecord?id=CVE-2026-114501
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-114501.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-114501
Aliases
  • GHSA-654x-cwwv-5j9c
Downstream
Published
2026-10-21T21:17:09Z
Modified
2026-10-23T02:45:35Z
Severity
  • 6.3 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
Pillow: Arrow export leaks stale heap memory when PILLOW_ALIGNMENT > 1
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-226",
        "CWE-908"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114501.json"
}
References

Affected packages

Git / github.com/python-pillow/pillow

Affected ranges

Type
GIT
Repo
https://github.com/python-pillow/pillow
Events
Introduced
339bc5db93bd95decf65a59fab273f300db6594d
Fixed
293218ad059d994baf1777d882911bed6a49704a
Fixed
19f64946eb247b973dd4560be7dea3bf979d2e6a
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "11.2.1"
                },
                {
                    "fixed":  "13.0.0"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "19f64946eb247b973dd4560be7dea3bf979d2e6a"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "13.0.0",
            "range":  [
                {
                    "fixed":  "293218ad059d994baf1777d882911bed6a49704a"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

11.*
11.2.1
11.3.0
12.*
12.0.0
12.1.0
12.2.0
12.3.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-114501.json"