Pillow is a Python imaging library. From version 11.2.1 to before version 12.2.0, passing nested lists as coordinates to APIs that accept coordinates such as ImagePath.Path, ImageDraw.ImageDraw.polygon and ImageDraw.ImageDraw.line could cause a heap buffer overflow, as nested lists were recursively unpacked beyond the allocated buffer. Coordinate lists are now validated to contain exactly two numeric coordinates. This issue has been patched in version 12.2.0.

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8399-1 advisory.

    It was discovered that Pillow incorrectly handled large glyph advance values in fonts. An attacker could     possibly use this issue to cause Pillow to crash, resulting in a denial of service. (CVE-2026-42308)

    It was discovered that Pillow incorrectly handled nested coordinate lists in certain APIs. An attacker     could possibly use this issue to cause Pillow to crash, resulting in a denial of service. This issue only     affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-42309)

    It was discovered that Pillow incorrectly handled certain malformed PDF files. An attacker could possibly     use this issue to cause Pillow to use excessive resources, leading to a denial of service.
    (CVE-2026-42310)

    It was discovered that Pillow incorrectly handled certain malformed PSD files. An attacker could possibly     use this issue to cause Pillow to crash, resulting in a denial of service, or to execute arbitrary code.
    This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-42311)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES16 / SLES_SAP16 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:21861-1 advisory.

    This update for python-Pillow fixes the following issues

    - CVE-2026-42308: integer overflow in font processing can lead to denial of service (bsc#1265359).
    - CVE-2026-42309: heap buffer overflow when processing nested list coordinates (bsc#1265153).
    - CVE-2026-42310: infinite loop and resource exhaustion when processing specially crafted PDFs     (bsc#1265154).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:20831-1 advisory.

    This update for python-Pillow fixes the following issues

    - CVE-2026-42308: integer overflow in font processing can lead to denial of service (bsc#1265359).
    - CVE-2026-42309: heap buffer overflow when processing nested list coordinates (bsc#1265153).
    - CVE-2026-42310: infinite loop and resource exhaustion when processing specially crafted PDFs     (bsc#1265154).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Pillow is a Python imaging library. From version 11.2.1 to before version 12.2.0, passing nested lists as     coordinates to APIs that accept coordinates such as ImagePath.Path, ImageDraw.ImageDraw.polygon and     ImageDraw.ImageDraw.line could cause a heap buffer overflow, as nested lists were recursively unpacked     beyond the allocated buffer. Coordinate lists are now validated to contain exactly two numeric     coordinates. This issue has been patched in version 12.2.0. (CVE-2026-42309)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
320408	Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : Pillow vulnerabilities (USN-8399-1)	Nessus	Ubuntu Local Security Checks	high
318243	SUSE SLES16 Security Update : python-Pillow (SUSE-SU-2026:21861-1)	Nessus	SuSE Local Security Checks	medium
318065	openSUSE 16 Security Update : python-Pillow (openSUSE-SU-2026:20831-1)	Nessus	SuSE Local Security Checks	medium
314409	Linux Distros Unpatched Vulnerability : CVE-2026-42309	Nessus	Misc.	medium

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CVE-2026-42309

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