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Vulnerability details

CVE-2026-112398

python-pillow Pillow

Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution

CVSS 4.0
9.2Critical

Official description

Pillow is a Python imaging library. Prior to 13.0.0, Pillow's FlashPix JPEG-tile decoder can write decoded scanlines beyond the allocated tile buffer. FlashPix (FPX) JPEG decoding selects raw mode LA with two bytes per pixel, while an unrecognized JPEG mode can be decoded as JCS_UNKNOWN with four components, causing ImagingJpegDecode to write four-component scanlines into the two-byte tile buffer. An attacker can supply a crafted OLE2 FlashPix file to an application with the optional olefile dependency installed that opens or thumbnails untrusted input. This can corrupt heap memory and may allow arbitrary code execution. This issue is fixed in version 13.0.0.

CVSS scores

ScoreVersionSourceVector
9.2Critical 4.0 CVEProject cvelistV5 (CNA) (GitHub_M) CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Affected products

VendorProductVersionsSource
python-pillow Pillow < 13.0.0 CVEProject cvelistV5 (CNA)

References and advisories

3
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Details

Published
2026-10-20
Last updated
2026-10-23
State
Published
Assigner (CNA)
GitHub_M
Kolun priority
27 · Low

Exploit prediction (EPSS)

0.69%
Probability of exploitation in 30 days
53.1%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
Proof of concept
Technical impact
Total

Weaknesses (CWE)

  • CWE-122
    Heap-based Buffer Overflow
  • CWE-787
    Out-of-bounds Write