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HIGH

CVE-2026-59197

CVSS v3

8.2

HIGH

EPSS Score

0.4 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • pillowPyPIall versions · fixed in 12.3.0
  • pillowBitnamiall versions · fixed in 12.3.0
  • python3-pillowAlmaLinux:8all versions · fixed in 5.1.1-23.el8_10and 3 other packages

Vendor advisories

  • CVE-2026-59197 Red Hat Product Security248 products fixed · 22 known affected

    Pillow: Pillow: Native heap out-of-bounds write

    exploit-intelligence-tech-preview/vulnerability-analysis-rhel9 as a component of Exploit Intelligence · lightspeed-core/lightspeed-stack-rhel9 as a component of Lightspeed Core · lightspeed-core/rag-tool-cpu-rhel9 as a component of Lightspeed Core

  • RHSA-2026:81110 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Quay

  • RHSA-2026:76150 Red Hat Product Security7 products fixed

    Red Hat Security Advisory: Red Hat Enterprise Linux AI 3.4.5 security update

  • RHSA-2026:76149 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Enterprise Linux AI 3.4.5 security update

  • RHSA-2026:73987 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: RHOAI 3.3.7 - Red Hat OpenShift AI

  • RHSA-2026:70996 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: Red Hat AI Inference Model Optimization Tools 3.4.5 (cuda)

26 more advisories

Full record on NVD

Description

Pillow is a Python imaging library. Prior to 12.3.0, Pillow's public rank-filter API can trigger a native heap out-of-bounds write when given a very large odd filter size because ImageFilter.RankFilter.filter() calls image.expand(size // 2, size // 2) before rank-filter size validation and ImagingExpand() computes output dimensions with unchecked signed int arithmetic. This issue is fixed in version 12.3.0.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Published
2026-07-14
Last Modified
2026-07-15
GitHub Advisory
GHSA-xj96-63gp-2gmr

Frequently asked questions

What is CVE-2026-59197?

Pillow is a Python imaging library. Prior to 12.3.0, Pillow's public rank-filter API can trigger a native heap out-of-bounds write when given a very large odd filter size because ImageFilter.RankFilter.filter() calls image.expand(size // 2, size // 2) before rank-filter size validation and ImagingExpand() computes output dimensions with unchecked signed int arithmetic. This issue is fixed in version 12.3.0.

Is CVE-2026-59197 actively exploited?

Active exploitation of CVE-2026-59197 has not been confirmed. Its EPSS score was 0.4% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-59197?

CVE-2026-59197 has a CVSS v3 base score of 8.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.

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