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Vulnerabilities

Vulnerability · CVE-2026-28231

pillow_heif is a Python library for working with HEIF images and plugin for Pillow.

Published Feb 27, 2026 · catalog updated Jun 17, 2026 · pillow_heif is a Python

Check if you run it

No confirmed exploitation is on record for CVE-2026-28231. EPSS is 0.73%. Act only if a listed version of pillow_heif 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_heif is a Python).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.73%
Remediation
Advisory link
Affected products
cpe bigcat88/pillow-heif

pillow_heif is a Python library for working with HEIF images and plugin for Pillow. Prior to version 1.3.0, an integer overflow in the encode path buffer validation of allows an attacker to bypass bounds checks by providing large image dimensions, resulting in a heap out-of-bounds read. This can lead to information disclosure (server heap memory leaking into encoded images) or denial of service (process crash). No special configuration is required — this triggers under default settings. Version 1.3.0 fixes the issue.

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.

  • cpe bigcat88/pillow-heifversion unspecified

How to fix CVE-2026-28231

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-2026-28231. EPSS is 0.73%. Act only if a listed version of pillow_heif is a Python is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-125: Out-of-bounds Read; CWE-190: Integer Overflow. EPSS 0.73%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

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

Timeline

Detection, updates, and resolution for this record.

  1. Feb 27, 2026 · NIST NVD

    Detected

    pillow_heif is a Python library for working with HEIF images and plugin for Pillow. Prior to version 1.3.0, an integer overflow in the encode path buffer validation of allows an attacker to bypass bounds checks by providing large image dimensions, resulting in a heap out-of-bounds read. This can lead to information disclosure (server heap memory leaking into encoded images) or denial of service (p

  2. Jun 17, 2026 · NIST NVD

    Updated

    pillow_heif is a Python library for working with HEIF images and plugin for Pillow. Prior to version 1.3.0, an integer overflow in the encode path buffer validation of allows an attacker to bypass bounds checks by providing large image dimensions, resulting in a heap out-of-bounds read. This can lead to information disclosure (server heap memory leaking into encoded images) or denial of service (p

Sources

  • CVE.orgVulnerability recordCVE-2026-28231

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-28231

    30-day exploitation probability 0.7%

    first.org
  • NIST NVDVulnerability recordCVE-2026-28231

    pillow_heif is a Python library for working with HEIF images and plugin for Pillow. Prior to version 1.3.0, an integer overflow in the encode path buffer validation of allows an attacker to bypass bounds checks by providing large image dimensions, resulting in a

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.