High · CVSS 8.7CVE-2026-128066GHSA-WQGW-9XFH-QF2G

Pillow: Memory DoS in TIFF and EXIF IFD parsing via overlapping tag dataCVE-2026-128066

Answer in brief

CVE-2026-128066 records a High severity (CVSS 8.7) vulnerability in Pillow: Memory DoS in TIFF and EXIF IFD parsing via overlapping tag data. The current sources do not mark it as known exploited. The current feed maps python-pillow/Pillow (generic), Pillow (pip). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 12, 2026Updated Nov 12, 2026Source checked Nov 12, 2026First seen by HOL Nov 12, 2026Material review Nov 12, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.7
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps python-pillow/Pillow (generic), Pillow (pip). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
python-pillow/Pillowgeneric	>=1.0 <13.0.0	13.0.0
Pillowpip	<=12.3.0	13.0.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for python-pillow/Pillow, Pillow.
Review the reported fix. Update python-pillow/Pillow to 13.0.0; Pillow to 13.0.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Nov 12, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Nov 12, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Nov 12, 2026

Sources and claim methodology

Upstream source description

Pillow is a Python imaging library. From 1.0 through 12.3.0, ImageFileDirectory_v2.load() in src/PIL/TiffImagePlugin.py retains a separate bytes object for each out-of-line IFD tag value without limiting the total data read or preventing distinct tags from referencing the same file region. A small crafted TIFF or EXIF-bearing JPEG, PNG, WebP, or MPO can therefore cause memory use quadratic in the input size. TIFF and some JPEG paths trigger parsing during Image.open(), while other formats are exposed when EXIF is requested, including through getexif() or ImageOps.exif_transpose(). The declared pixel dimensions do not bound this metadata allocation, so decompression-bomb checks do not prevent process memory exhaustion. This issue is fixed in version 13.0.0.

Quoted source text, attributed separately from HOL analysis.