CVE-2026-55798 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-55798MEDIUM

python-pillow Pillow — Pillow: WindowsViewer.get_command() OS command injection via unescaped shell path

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   H   N   R  U  L  L  L    4.5   .0018    7.6     —

AFFECTED
  Product  Versions    Fixed
  Pillow   < 12.3.0 –  —

TIMELINE
  Jun 17  Reserved by GitHub_M
  Jul 6   EXPLOIT PUBLISHED — CVE-2026-55798 (python-pillow Pillow). Public exploit reference added.
  Jul 6   Published (CNA: GitHub_M)

CWE-78 · CNA: GitHub_M · CVSS v3.1 · 5 references · NVD status: Analyzed

Description

Pillow is a Python imaging library. Prior to 12.3.0, WindowsViewer.get_command() constructed a cmd.exe shell command by directly embedding a file path into an f-string without escaping and passed the result to subprocess.Popen(..., shell=True), allowing shell metacharacters in the file path to inject arbitrary cmd.exe commands. This issue is fixed in version 12.3.0.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 17, 2026	Reserved	Reserved by GitHub_M
July 6, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-55798 (python-pillow Pillow). Public exploit reference added.
July 6, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
python-pillow	Pillow	—	< 12.3.0	—

Weaknesses

CWE-78

References (5)

https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst [Release Notes]
https://github.com/python-pillow/Pillow/commit/8404ea5fe5df40fc34aa1e51403dd6fce0778b8a [Patch]
https://github.com/python-pillow/Pillow/commit/88194166691b7b603529b8b036ab3ab9cedd2de4 [Patch]
https://github.com/python-pillow/Pillow/commit/b0e06caa64c1405aa3da0bb1d2bd9a77ca22de7f [Patch]
https://github.com/python-pillow/Pillow/security/advisories/GHSA-4x4j-2g7c-83w6 [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-55798 at cve.org

Vendors: python-pillow

Weaknesses: CWE-78

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-55798 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.