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  4. CVE 2026 112399 pillow apng background disposal allocates full
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Back to active CVEs
High · CVSS 8.7CVE-2026-112399

Pillow: APNG background disposal allocates full canvas before decompression bomb checkCVE-2026-112399

Answer in brief

CVE-2026-112399 records a High severity (CVSS 8.7) vulnerability in Pillow: APNG background disposal allocates full canvas before decompression bomb check. The current sources do not mark it as known exploited. The current feed maps python-pillow/Pillow (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

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

Published Oct 19, 2026Updated Oct 19, 2026Source checked Oct 19, 2026First seen by HOL Oct 19, 2026Material review Oct 19, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.7
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
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). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
python-pillow/Pillowgeneric>=8.1.0 <13.0.013.0.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for python-pillow/Pillow.
  2. 2Review the reported fix. Update python-pillow/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

  1. Published upstream

    Oct 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 19, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Pillow is a Python imaging library. From 8.1.0 until 13.0.0, Pillow can allocate an APNG disposal background at the full canvas size before applying the decompression-bomb check. A crafted APNG with a small first frame, a very large declared canvas, and background disposal or first-frame OP_PREVIOUS reaches PngImageFile._seek while Image.open() positions frame zero. The full-canvas allocation occurs inside Image.open() without requiring pixel loading or frame iteration. This can exhaust memory and deny service. This issue is fixed in version 13.0.0.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Pillow: Infinite loop in MIC n_frames when the embedded TIFFSame python-pillow/pillow package
  • Pillow: PdfParser can recurse without limit in get_value() and linearize_page_tree()Same python-pillow/pillow package
  • Pillow: NULL dereference in ImagingExpand via rank filters on zero-size imagesSame python-pillow/pillow package
  • Pillow: Heap buffer overflow in _tiffWriteProc when saving TIFF to BytesIOSame python-pillow/pillow package
  • Pillow: P;2L and P;4L decoders may read 1 to 3 bytes past the passed buffer sizeSame python-pillow/pillow package
  • Pillow tiled-TIFF decoder reads past tile buffer in copy4 (Unpack.c:1290)Same python-pillow/pillow package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-789
Source
CVE List V5
Source checked
Oct 19, 2026
References
3 linked sources
Open source record