CVE-2026-96641

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Source
https://cve.org/CVERecord?id=CVE-2026-96641
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-96641.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-96641
Aliases
  • GHSA-4rm8-3hmm-39fg
Downstream
Published
2026-10-21T20:51:24Z
Modified
2026-10-22T13:12:17Z
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",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "fixed":  "13.0.0"
                        }
                    ],
                    "source":  "AFFECTED_FIELD",
                    "strategy":  "StringRangeExpression"
                }
            ]
        },
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "fixed":  "13.0.0"
                        },
                        {
                            "fixed":  "13.0.0"
                        }
                    ],
                    "source":  "DESCRIPTION"
                }
            ]
        }
    ]
}
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
80de4be9e38d3a6148dd4d8491eb80cd12b760a4
Fixed
293218ad059d994baf1777d882911bed6a49704a
Database specific
Show details 
{
    "extracted_events":  [
        {
            "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/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 
"2026-10-22T13:12:17Z"