Skip to content
Patch Next
Sign inAdd to your agent

← Actionable
High, CVSS 8.7amended

Pillow: NULL pointer dereference in Image.merge via an unvalidated band 0

CVE-2026-112405GHSA-cp9v-662q-vvx9

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.

Add to your agent

Affected packages

  • Bitnami pillow

    Affected
    >= 12.0.0, < 13.0.0
    Fixed in
    13.0.0

  • PyPI pillow

    Affected
    >= 12.0.0, < 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
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2026-112405: 0.59% estimated exploitation activity in the next 30 days; percentile 48.47 (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 `Image.merge()` checks the mode of every input band except band 0. If band 0 is a single-band `I` or `F` image, the native merge routine reads a pixel pointer that is NULL for those modes and the process crashes. The IPTC plugin reaches this from a plain `Image.open()` followed by a load, and IPTC has no magic-byte prefilter, so a crafted file with no recognizable header can drive it.

Details The validation loop skips band 0: - `src/PIL/Image.py:3795` iterates `for band in bands[1:]` and checks mode and size only for those. For an `I` or `F` image the 8-bit plane `image8` is NULL (only `image32` is set). `ImagingMerge` dereferences `bands[0]->image8[y]` for the multi-band output modes: - `src/libImaging/Bands.c:302`, `:311`, `:321` The IPTC loader builds the band list from an attacker-typed sub-image and passes it to merge with the sub-image at index 0: - `src/PIL/IptcImagePlugin.py:156-160` - `src/PIL/IptcImagePlugin.py:169` registers the opener with no accept…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 10 · amended ·

    Amended from osv record BIT-pillow-2026-112405

  2. Revision 9 · amended ·

    Amended from osv record BIT-pillow-2026-112405

  3. Revision 8 · amended ·

    Amended from osv record PYSEC-2026-4333

  4. Revision 7 · amended ·

    Amended from osv record GHSA-cp9v-662q-vvx9

  5. Revision 6 · amended ·

    Amended from ghsa record GHSA-cp9v-662q-vvx9

  6. Revision 5 · amended ·

    Amended from osv record BIT-pillow-2026-112405

  7. Revision 4 · amended ·

    Amended from osv record GHSA-cp9v-662q-vvx9

  8. Revision 3 · amended ·

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

  9. Revision 2 · amended ·

    Amended from osv record GHSA-cp9v-662q-vvx9

  10. Revision 1 · created ·

    Published from ghsa record GHSA-cp9v-662q-vvx9

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-2026-112405

Advisory: Pillow: NULL pointer dereference in Image.merge via an unvalidated band 0
IDs: CVE-2026-112405, GHSA-cp9v-662q-vvx9
Record: https://patchnext.com/advisories/cve-2026-112405 (revision 10, 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: High (CVSS 8.7)
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 >= 12.0.0, < 13.0.0; fixed in 13.0.0
- PyPI pillow: affected >= 12.0.0, < 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-cp9v-662q-vvx9 (GitHub-reviewed advisory GHSA-cp9v-662q-vvx9 lists affected ranges: PyPI pillow >=12.0.0 <13.0.0)
- Verified: https://osv.dev/vulnerability/GHSA-cp9v-662q-vvx9 (OSV record GHSA-cp9v-662q-vvx9 lists affected ranges: PyPI pillow >=12.0.0 <13.0.0 (fixed))
- Verified: https://osv.dev/vulnerability/BIT-pillow-2026-112405 (OSV record BIT-pillow-2026-112405 lists affected ranges: Bitnami pillow >=12.0.0 <13.0.0 (fixed))
- Verified: https://osv.dev/vulnerability/PYSEC-2026-4333 (OSV record PYSEC-2026-4333 lists affected ranges: PyPI pillow >=12.0.0 <13.0.0 (fixed))

Commands are suggestions: review each one before running it.

Loading voting…