CVE-2026-96644

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Source
https://cve.org/CVERecord?id=CVE-2026-96644
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-96644.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-96644
Aliases
Downstream
CGA (27)
UBUNTU (1)
Published
2026-10-21T20:54:43Z
Modified
2026-10-22T17:03:36Z
Severity
  • 7.1 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
Pillow: Heap over-read in WMF/EMF rendering via 16-bit dimension truncation (Windows builds)
Details

Pillow is a Python imaging library. Prior to 13.0.0 on Windows, src/PIL/WmfImagePlugin.py passes unchecked 32-bit WMF or EMF dimensions to the native drawwmf handler in src/display.c. The handler sizes a DIB allocation from 16-bit-truncated bcWidth and bcHeight fields but copies pixel data using the original full dimensions. A crafted wide, short metafile can pass the pixel-count decompression-bomb check and make the Windows-only renderer read beyond the heap buffer, potentially disclosing memory or crashing the process. This issue is fixed in version 13.0.0.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/96xxx/CVE-2026-96644.json"
}
References

Affected packages

Git / github.com/python-pillow/pillow

Affected ranges

Type
GIT
Repo
https://github.com/python-pillow/pillow
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
293218ad059d994baf1777d882911bed6a49704a
Fixed
4cf46bee338304c5c8968fd7f132ba0d40c428b7
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "13.0.0"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "fixed": "4cf46bee338304c5c8968fd7f132ba0d40c428b7"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "13.0.0",
            "range": [
                {
                    "fixed": "293218ad059d994baf1777d882911bed6a49704a"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Affected versions

1.*
1.0
1.2
1.7.7
1.7.8
10.*
10.0.0
10.1.0
10.2.0
10.3.0
10.4.0
11.*
11.0.0
11.1.0
11.2.1
11.3.0
12.*
12.0.0
12.1.0
12.2.0
12.3.0
2.*
2.0.0
2.1.0
2.2.0
2.2.1
2.3.0
2.5.0
2.7.0
2.8.0
2.8.1
2.9.0
2.9.0.dev0
2.9.0.dev1
2.9.0.dev2
3.*
3.1.0
3.1.0-rc1
3.2.0
3.3.0
3.4.0
4.*
4.0.0
4.0.0a
4.1.0
4.2.0
4.3.0
5.*
5.0.0
5.1.0
5.2.0
5.3.0
5.4.0
6.*
6.0.0
6.1.0
6.2.0
7.*
7.0.0
7.1.0
7.2.0
8.*
8.0.0
8.1.0
8.2.0
8.3.0
8.4.0
9.*
9.0.0
9.1.0
9.2.0
9.3.0
9.4.0
9.5.0

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-96644.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "function_hash": "46953202414908588935193408500707055659",
            "length": 1465
        },
        "id": "CVE-2026-96644-4fd373cd",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/python-pillow/pillow/commit/4cf46bee338304c5c8968fd7f132ba0d40c428b7",
        "target": {
            "file": "src/display.c",
            "function": "PyImaging_DrawWmf"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "93128461572598178854605054216111269944",
                "220453984303963180922819129286075982687",
                "117665431000893290846257799512856649817"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-96644-f7b4df4a",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/python-pillow/pillow/commit/4cf46bee338304c5c8968fd7f132ba0d40c428b7",
        "target": {
            "file": "src/display.c"
        }
    }
]
vanir_signatures_modified 
"2026-10-22T17:03:36Z"