CVE-2026-96638

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Source
https://cve.org/CVERecord?id=CVE-2026-96638
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-96638.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-96638
Aliases
Downstream
CGA (28)
DEBIAN (1)
ECHO (1)
Published
2026-10-21T20:47:21Z
Modified
2026-10-23T02:45:26Z
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: BMP RLE decoder memory-amplification DoS via unbounded delta escape / absolute mode
Details

Pillow is a Python imaging library. From 9.1.0 until 13.0.0, BmpRleDecoder.decode() in src/PIL/BmpImagePlugin.py permits crafted RLE BMP delta escapes and absolute-mode runs to append beyond the remaining dest_length without a per-branch cap. A delta can add roughly 255 image rows in one iteration, so a kilobyte-sized file with a large but permitted width can expand the data bytearray to hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-400",
        "CWE-770"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/96xxx/CVE-2026-96638.json"
}
References

Affected packages

Git / github.com/python-pillow/pillow

Affected ranges

Type
GIT
Repo
https://github.com/python-pillow/pillow
Events
Introduced
5d070222d21138d2ead002fd33fdf5adcb708941
Fixed
293218ad059d994baf1777d882911bed6a49704a
Fixed
e7794835e323ff2691d9b3a974cade1a44301b9a
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "9.1.0"
                },
                {
                    "fixed":  "13.0.0"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "e7794835e323ff2691d9b3a974cade1a44301b9a"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "13.0.0",
            "range":  [
                {
                    "fixed":  "293218ad059d994baf1777d882911bed6a49704a"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

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
9.*
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-2026-96638.json"