CVE catalog

CVE-2026-55798

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

[CVE catalog]

Severity: Medium · CVSS 4.5CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Published: Jul 6, 2026, 6:44:38 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.18% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	pillow	sid	`13.0.0-1`	not affected
Debian	pillow	forky	`12.3.0-1`	not affected
Debian	pillow	trixie	`11.1.0-5+deb13u4`	not affected
Debian	pillow	trixie-security	`11.1.0-5+deb13u3`	not affected
Debian	pillow	bookworm	`9.4.0-1.1+deb12u1`	not affected
Debian	pillow	bookworm-security	`9.4.0-1.1+deb12u1`	not affected
Cpe	pillow	Not reported	`12.3.0`	fixed
Pip	Pillow	Not reported	`12.3.0`	fixed
PyPI	pillow	Not reported	`12.3.0`	fixed
Cpe	pillow	Not reported	`12.3.0`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	pillow	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	pillow	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	pillow	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	pillow	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Cpe	pillow	cpe	Not reported	`12.3.0`	Not reported	Not reported	Not reported
Pip	Pillow	pip	Not reported	`12.3.0`	Not reported	Not reported	Not reported
PyPI	pillow	PyPI	Not reported	`12.3.0`	Not reported	GHSA-4X4J-2G7C-83W6	Not reported
Cpe	pillow	cpe	Not reported	`12.3.0`	Not reported	NVD-CVE-2026-55798	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[python3-pil]Not affected
Source package: [pillow]
Details (4)
- 9.4.0-1.1+deb12u1 · amd64 · bookworm
  Not affected
  nvd · pillow · debian · bookworm
- 9.4.0-1.1+deb12u1 · arm64 · bookworm
  Not affected
  nvd · pillow · debian · bookworm
- 9.4.0-1.1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · pillow · debian · bookworm
- 9.4.0-1.1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · pillow · debian · bookworm
[python3-pil.imagetk]Not affected
Source package: [pillow]
Details (4)
- 9.4.0-1.1+deb12u1 · amd64 · bookworm
  Not affected
  nvd · pillow · debian · bookworm
- 9.4.0-1.1+deb12u1 · arm64 · bookworm
  Not affected
  nvd · pillow · debian · bookworm
- 9.4.0-1.1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · pillow · debian · bookworm
- 9.4.0-1.1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · pillow · debian · bookworm
[python-pil-doc]Not affected
Source package: [pillow]
Details (4)
- 9.4.0-1.1+deb12u1 · all · bookworm
  Not affected
  nvd · pillow · debian · bookworm
- 9.4.0-1.1+deb12u1 · all · bookworm
  Not affected
  nvd · pillow · debian · bookworm
- 9.4.0-1.1+deb12u1 · all · bookworm-security
  Not affected
  nvd · pillow · debian · bookworm
- 9.4.0-1.1+deb12u1 · all · bookworm-security
  Not affected
  nvd · pillow · debian · bookworm

Observed: Oct 27, 2026, 7:13:12 AM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]