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    CVE-2026-40192

    Pillow is a Python imaging library. Versions 10.3.0 through 12.1.1 did not limit the amount of GZIP-compressed data read when decoding a FITS image, making them vulnerable to decompression bomb attacks. A specially crafted FITS file could cause unbounded memory consumption, leading to denial of service (OOM crash or severe performance degradation). If users are unable to immediately upgrade, they should only open specific image formats, excluding FITS, as a workaround.

    Published:Apr 15, 2026
    Last Modified:Sep 1, 2026
    EPS:Apr 15, 2026
    EPSS Score:0.00671
    CVSS Score:7.5

    Affected Products

    Vendor
    Python
    Product
    Pillow
    Vendor
    Python-pillow
    Product
    Pillow

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-42311 (CVSS 8.6) — Pillow is a Python imaging library. From version 10.3.0 to before version 12.2.0, processing a malicious PSD f…
    CVE-2026-42310 (CVSS 5.1) — Pillow is a Python imaging library. From version 4.2.0 to before version 12.2.0, an attacker can supply a mali…
    CVE-2026-42308 (CVSS 5.1) — Pillow is a Python imaging library. Prior to version 12.2.0, if a font advances for each glyph by an exceeding…
    CVE-2026-42309 (CVSS 5.1) — Pillow is a Python imaging library. From version 11.2.1 to before version 12.2.0, passing nested lists as coor…
    CVE-2026-25990 (CVSS 8.6) — Pillow is a Python imaging library. From 10.3.0 to before 12.1.1, an out-of-bounds write may be triggered when…
    CVE-2025-48379 (CVSS 7.1) — Pillow is a Python imaging library. In versions 11.2.0 to before 11.3.0, there is a heap buffer overflow when …
    CVE-2024-28219 (CVSS 6.7) — In _imagingcms.c in Pillow before 10.3.0, a buffer overflow exists because strcpy is used instead of strncpy.…
    CVE-2023-50447 (CVSS 8.1) — Pillow through 10.1.0 allows PIL.ImageMath.eval Arbitrary Code Execution via the environment parameter, a diff…
    CVE-2023-44271 (CVSS 7.5) — An issue was discovered in Pillow before 10.0.0. It is a Denial of Service that uncontrollably allocates memor…
    CVE-2022-45199 (CVSS 7.5) — Pillow before 9.3.0 allows denial of service via SAMPLESPERPIXEL.…

    References

    https://github.com/python-pillow/Pillow/commit/3cb854e8b2bab43f40e342e665f9340d861aa628
    https://github.com/python-pillow/Pillow/pull/9521
    https://github.com/python-pillow/Pillow/security/advisories/GHSA-whj4-6x5x-4v2j
    https://pillow.readthedocs.io/en/stable/releasenotes/12.2.0.html#prevent-fits-decompression-bomb
    https://access.redhat.com/errata/RHSA-2026:16008
    https://access.redhat.com/errata/RHSA-2026:16009
    https://access.redhat.com/errata/RHSA-2026:16030
    https://access.redhat.com/errata/RHSA-2026:16174
    https://access.redhat.com/errata/RHSA-2026:17609
    https://access.redhat.com/errata/RHSA-2026:17611
    https://access.redhat.com/errata/RHSA-2026:19375
    https://access.redhat.com/errata/RHSA-2026:19712
    https://access.redhat.com/errata/RHSA-2026:21017
    https://access.redhat.com/errata/RHSA-2026:22465
    https://access.redhat.com/errata/RHSA-2026:22629
    https://access.redhat.com/errata/RHSA-2026:22840
    https://access.redhat.com/errata/RHSA-2026:23361
    https://access.redhat.com/errata/RHSA-2026:24761
    https://access.redhat.com/errata/RHSA-2026:24762
    https://access.redhat.com/errata/RHSA-2026:24853
    https://access.redhat.com/errata/RHSA-2026:24866
    https://access.redhat.com/errata/RHSA-2026:24977
    https://access.redhat.com/errata/RHSA-2026:27076
    https://access.redhat.com/errata/RHSA-2026:34365
    https://access.redhat.com/errata/RHSA-2026:34366
    https://access.redhat.com/errata/RHSA-2026:34368
    https://access.redhat.com/errata/RHSA-2026:37275
    https://access.redhat.com/errata/RHSA-2026:57387
    https://access.redhat.com/errata/RHSA-2026:61627
    https://access.redhat.com/errata/RHSA-2026:61628
    https://access.redhat.com/errata/RHSA-2026:61629
    https://access.redhat.com/security/cve/CVE-2026-40192
    https://bugzilla.redhat.com/show_bug.cgi?id=2458856
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40192.json

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High