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HIGH

CVE-2026-55380

CVSS v3

7.5

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 5.1.1-22.el8_10and 3 other packages

Vendor advisories

  • CVE-2026-55380 Red Hat Product Security268 products fixed · 20 known affected

    python-pillow: Pillow: Denial of Service via crafted GD 2.x image file

    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-2026:70996 Red Hat Product Security2 products fixed

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

  • RHSA-2026:70995 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat AI Inference 3.4.5 (rocm)

34 more advisories

Full record on NVD

Description

Pillow is a Python imaging library. Prior to 12.3.0, PIL/GdImageFile.py GdImageFile._open() read image dimensions from the GD 2.x header and stored them in self._size without calling Image._decompression_bomb_check(), allowing a crafted .gd file to trigger excessive C-heap allocation when loaded. 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:N/A:H
Published
2026-07-06
Last Modified
2026-07-07
GitHub Advisory
GHSA-phj9-mv4w-65pm

Frequently asked questions

What is CVE-2026-55380?

Pillow is a Python imaging library. Prior to 12.3.0, PIL/GdImageFile.py GdImageFile._open() read image dimensions from the GD 2.x header and stored them in self._size without calling Image._decompression_bomb_check(), allowing a crafted .gd file to trigger excessive C-heap allocation when loaded. This issue is fixed in version 12.3.0.

Is CVE-2026-55380 actively exploited?

Active exploitation of CVE-2026-55380 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-2026-55380?

CVE-2026-55380 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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