CVE-2026-40192 (GCVE-0-2026-40192)

Vulnerability from cvelistv5 – Published: 2026-04-15 22:53 – Updated: 2026-06-30 03:16
VLAI
Title
Pillow is vulnerable to a FITS GZIP decompression bomb
Summary
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.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
URL Tags
https://github.com/python-pillow/Pillow/security/… x_refsource_CONFIRM
https://github.com/python-pillow/Pillow/pull/9521 x_refsource_MISC
https://github.com/python-pillow/Pillow/commit/3c… x_refsource_MISC
https://pillow.readthedocs.io/en/stable/releaseno… x_refsource_MISC
https://access.redhat.com/security/cve/CVE-2026-40192 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2458856 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:24761 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27076 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:24762 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:16008 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:16030 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:16009 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:16174 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:24866 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:17611 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:17609 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:24977 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19712 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22629 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21017 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:24853 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19375 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22465 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22840 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23361 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
python-pillow Pillow Affected: >= 10.3.0, < 12.2.0
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      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-40192\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-16T13:37:11.864898Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-16T13:37:15.349Z\"}}], \"cna\": {\"title\": \"Pillow is vulnerable to a FITS GZIP decompression bomb\", \"source\": {\"advisory\": \"GHSA-whj4-6x5x-4v2j\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 8.7, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"python-pillow\", \"product\": \"Pillow\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003e= 10.3.0, \u003c 12.2.0\"}]}], \"references\": [{\"url\": \"https://github.com/python-pillow/Pillow/security/advisories/GHSA-whj4-6x5x-4v2j\", \"name\": \"https://github.com/python-pillow/Pillow/security/advisories/GHSA-whj4-6x5x-4v2j\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/python-pillow/Pillow/pull/9521\", \"name\": \"https://github.com/python-pillow/Pillow/pull/9521\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/python-pillow/Pillow/commit/3cb854e8b2bab43f40e342e665f9340d861aa628\", \"name\": \"https://github.com/python-pillow/Pillow/commit/3cb854e8b2bab43f40e342e665f9340d861aa628\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://pillow.readthedocs.io/en/stable/releasenotes/12.2.0.html#prevent-fits-decompression-bomb\", \"name\": \"https://pillow.readthedocs.io/en/stable/releasenotes/12.2.0.html#prevent-fits-decompression-bomb\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-770\", \"description\": \"CWE-770: Allocation of Resources Without Limits or Throttling\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-400\", \"description\": \"CWE-400: Uncontrolled Resource Consumption\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-04-15T22:53:56.147Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-40192\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-16T13:37:19.918Z\", \"dateReserved\": \"2026-04-09T20:59:17.620Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-04-15T22:53:56.147Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.