CVE-2026-112390

Pillow: Infinite loop in MIC n_frames when the embedded TIFF

At a glance

Severity: HIGH 8.2
EPSS: EPSS 0.59 % · percentile 48 (2026-10-27)
State: PUBLISHED
Published: 2026-10-19
Updated: 2026-10-20
Assigner: GitHub_M
NVD status: Analyzed

Description

Pillow is a Python imaging library. From 7.2.0 until 13.0.0, Pillow can enter an infinite loop while determining the frame count of a MIC image. MicImageFile inherits TIFF frame traversal, but MicImageFile.tell reports the OLE stream index and its seek() resets TIFF frame state, so an embedded TIFF with at least three IFDs never advances. When an application with olefile installed reads n_frames or saves all frames from a crafted MIC file, the non-advancing traversal can hold a worker at full CPU indefinitely. This issue is fixed in version 13.0.0.

Scores

Version	Score	Vector	Scored by
CVSS 4.0	HIGH 8.2	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	GitHub_M
CVSS 4.0	HIGH 8.2	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X	NVD · security-advisories@github.com (Secondary)
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

CWE-835

Advisories

GHSA-22hg-r758-rrw9 — Pillow: Infinite loop in MIC n_frames when the embedded TIFF

European references

ENISA EUVD · EUVD-2026-104598
GCVE · GCVE-0-2026-112390

Affected configurations (NVD CPE)

cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:* ≥ 7.2.0 < 13.0.0

Affected products

Product	Versions
python-pillow · Pillow	affected >= 7.2.0, < 13.0.0

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD