CVE-2026-96641

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Source
https://cve.org/CVERecord?id=CVE-2026-96641
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-96641.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-96641
Aliases
Downstream
CGA (28)
DEBIAN (1)
UBUNTU (1)
Published
2026-10-21T20:51:24Z
Modified
2026-10-22T17:03:36Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Pillow: Reachable undefined behavior in native integer operations, potentially leading to denial of service or logic integrity compromise
Details

Pillow is a Python imaging library. Prior to 13.0.0, PILfont text-width accumulation in src/_imaging.c checks positive glyph advances against INT_MAX but does not check negative advances against INT_MIN. Repeating a signed 16-bit advance of -32768 can therefore execute a signed C integer overflow in xsize += dx, producing a large positive width from a negative mathematical result. Applications that use getlength(), getsize(), or derived layout, quota, serialization, or allocation calculations can experience logic-integrity errors or resource consumption, while the high-level mask path commonly retains a decompression-bomb check. This issue is fixed in version 13.0.0.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-190"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/96xxx/CVE-2026-96641.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
80de4be9e38d3a6148dd4d8491eb80cd12b760a4
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "13.0.0"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "fixed": "80de4be9e38d3a6148dd4d8491eb80cd12b760a4"
                }
            ],
            "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-2026-96641.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "function_hash": "24350347155157544042205301785092810593",
            "length": 348
        },
        "id": "CVE-2026-96641-92e707e4",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/python-pillow/pillow/commit/80de4be9e38d3a6148dd4d8491eb80cd12b760a4",
        "target": {
            "file": "src/_imaging.c",
            "function": "textwidth"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "162774002408016075706002191493050065701",
                "301949638008089508114074403907582014158",
                "286992270447891107750639652328547358814",
                "60831605151601509104656217485518928052"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-96641-f2ae6064",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/python-pillow/pillow/commit/80de4be9e38d3a6148dd4d8491eb80cd12b760a4",
        "target": {
            "file": "src/_imaging.c"
        }
    }
]
vanir_signatures_modified 
"2026-10-22T17:03:36Z"