CVE-2026-55798Public exploit

Arbitrary command execution via unescaped Windows path

Published Jul 6, 2026 · Updated Jul 6, 2026

OS command injection in Pillow before 12.3.0 allows local users to execute arbitrary commands through a crafted Windows file path. WindowsViewer.get_command() embeds the path unescaped in an f-string and passes the resulting command to subprocess.Popen with shell execution enabled. Exploitation requires control of the path and user execution of the viewer result; injected commands run with the invoking user's privileges.

CVSS severity4.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Pillow before 12.3.0 allows local users to execute arbitrary commands through a crafted Windows file path. WindowsViewer.get_command() embeds the path unescaped in an f-string and passes the resulting command to subprocess.Popen with shell execution enabled. Exploitation requires control of the path and user execution of the viewer result; injected commands run with the invoking user's privileges.

The record

CVE
CVE-2026-55798
Published
Jul 6, 2026
Updated
Jul 6, 2026
Vendor
Pillow
Product
Pillow
Classifications
CWE-78, T1059.003
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 12.3.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Pillow · Pillowversion=< 12.3.0

Published CVSS scores

4.5GitHub, Inc.CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.003Command and Scripting Interpreter: Windows Command Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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