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Vulnerabilities

Security fix · CVE-2026-55380

Pillow is a Python imaging library.

Published Jul 6, 2026 · catalog updated Oct 26, 2026 · Pillow is a Python

Last checked Oct 29, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-55380. EPSS is 0.52%. Act only if a listed version of Pillow is a Python is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Pillow is a Python).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.52%
Remediation
Advisory link
Affected products
Debian:12 pillow · Debian:13 pillow · Debian:14 pillow

Pillow is a Python imaging library. Prior to 12.3.0, PIL/GdImageFile.py GdImageFile._open() read image dimensions from the GD 2.x header and stored them in self._size without calling Image._decompression_bomb_check(), allowing a crafted .gd file to trigger excessive C-heap allocation when loaded. This issue is fixed in version 12.3.0.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 pillow10.0.0-1, 10.1.0-1, 10.2.0-1
  • Debian:13 pillow11.1.0-5, 11.1.0-5+deb13u1, 11.1.0-5+deb13u2
  • Debian:14 pillow0 → 12.3.0-1

How to fix CVE-2026-55380

  • Upgrade

    CVE-2026-55380 lists a fix boundary at 12.3.0-1. Compare the installed build with that boundary before you change production.

  • Version check

    Fixed in 12.3.0-1 · 6 other ranges on the advisory

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-55380. EPSS is 0.52%. Act only if a listed version of Pillow is a Python is installed.

Which versions are affected?

Compare what you have installed with 10.0.0-1, 10.1.0-1, 10.2.0-1, 11.1.0-5, 11.1.0-5+deb13u1, 11.1.0-5+deb13u2, 0 → 12.3.0-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.52%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian securityPillow security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 6, 2026 · Trivy Vulnerability DB

    Detected

    Pillow is a Python imaging library. Prior to 12.3.0, PIL/GdImageFile.py GdImageFile._open() read image dimensions from the GD 2.x header and stored them in self._size without calling Image._decompression_bomb_check(), allowing a crafted .gd file to trigger excessive C-heap allocation when loaded. This issue is fixed in version 12.3.0.

  2. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    pillow fixed in 12.3.0-1

  3. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    pillow fixed in 12.3.0-1

  4. Oct 26, 2026 · Trivy Vulnerability DB

    Updated

    Pillow is a Python imaging library. Prior to 12.3.0, PIL/GdImageFile.py GdImageFile._open() read image dimensions from the GD 2.x header and stored them in self._size without calling Image._decompression_bomb_check(), allowing a crafted .gd file to trigger excessive C-heap allocation when loaded. This issue is fixed in version 12.3.0.

Sources

  • CVE.orgVulnerability recordCVE-2026-55380

    Official CVE identifier

    cve.org
  • Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-55380

    Pillow is a Python imaging library. Prior to 12.3.0, PIL/GdImageFile.py GdImageFile._open() read image dimensions from the GD 2.x header and stored them in self._size without calling Image._decompression_bomb_check(), allowing a crafted .gd file to trigger excessive C-heap alloca

    osv.dev

References

Freshness

Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 26, 2026
  • Trivy Vulnerability DBOct 26, 2026