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Critical, CVSS 9.2amended

Pillow: Argument Injection in Ghostscript call, potentially leading into RCE

CVE-2026-112900GHSA-w889-685w-c8fh

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (pillow 13.0.0; pillow 13.0.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Bitnami pillow

    Affected
    >= 2.6.0, < 13.0.0
    Fixed in
    13.0.0

  • PyPI pillow

    Affected
    >= 2.6.0, < 13.0.0
    Fixed in
    13.0.0

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
9.2 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2026-112900: 1.30% estimated exploitation activity in the next 30 days; percentile 70.54 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary `PIL.EpsImagePlugin.Ghostscript()` builds the Ghostscript command line using the input file path (`fp.name`) without sanitization, placing it at `-f `. A filename beginning with `-` is interpreted by Ghostscript as an option, giving command-line argument injection; chainable to RCE (see Impact). Reproduces with Pillow's default invocation (with `-dSAFER` enabled).

Details _Give all details on the vulnerability. Pointing to the incriminated source code is very helpful for the maintainer._

Type CWE-88 (Argument Injection) (→ CWE-78 (OS Command Injection) optionally, with attacker controlled text file)

Vulnerable Codes ```python infile_temp = None if hasattr(fp, "name") and os.path.exists(fp.name): infile = fp.name

user-controlled path used as-is, without validation else: in_fd, infile_temp = tempfile.mkstemp() os.close(in_fd) infile = infile_temp

... (copy fp into a temporary file)

Build Ghostscript command command = gs_binary, "-q",…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 7 · amended ·

    Amended from osv record BIT-pillow-2026-112900

  2. Revision 6 · amended ·

    Amended from ghsa record GHSA-w889-685w-c8fh

  3. Revision 5 · amended ·

    Amended from osv record BIT-pillow-2026-112900

  4. Revision 4 · amended ·

    Amended from osv record GHSA-w889-685w-c8fh

  5. Revision 3 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  6. Revision 2 · amended ·

    Amended from osv record GHSA-w889-685w-c8fh

  7. Revision 1 · created ·

    Published from ghsa record GHSA-w889-685w-c8fh

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-112900

Advisory: Pillow: Argument Injection in Ghostscript call, potentially leading into RCE
IDs: CVE-2026-112900, GHSA-w889-685w-c8fh
Record: https://patchnext.com/advisories/cve-2026-112900 (revision 7, source checked 30 Oct 2026, 07:30 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: pillow 13.0.0; pillow 13.0.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Bitnami pillow: affected >= 2.6.0, < 13.0.0; fixed in 13.0.0
- PyPI pillow: affected >= 2.6.0, < 13.0.0; fixed in 13.0.0

## Suggested inspection (read-only)
- Bitnami pillow: check the installed version with your package manager.
- `python -m pip show pillow`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on pillow.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-w889-685w-c8fh (GitHub-reviewed advisory GHSA-w889-685w-c8fh lists affected ranges: PyPI pillow >=2.6.0 <13.0.0)
- Verified: https://osv.dev/vulnerability/GHSA-w889-685w-c8fh (OSV record GHSA-w889-685w-c8fh lists affected ranges: PyPI pillow >=2.6.0 <13.0.0 (fixed))
- Verified: https://osv.dev/vulnerability/BIT-pillow-2026-112900 (OSV record BIT-pillow-2026-112900 lists affected ranges: Bitnami pillow >=2.6.0 <13.0.0 (fixed))

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