Vulnerability · Published Oct 19, 2026 · Assigned by GitHub_M
CVE-2026-112390Pillow: Infinite loop in MIC n_frames when the embedded TIFF
High 8.2
In plain English
A high-severity infinite loop in Pillow from python-pillow. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | pillow | no fix listed | DEBIAN-CVE-2026-112390 |
| Debian:13 | pillow | no fix listed | DEBIAN-CVE-2026-112390 |
| Debian:14 | pillow | no fix listed | DEBIAN-CVE-2026-112390 |
| PyPI | pillow | 13.0.0 | GHSA-22hg-r758-rrw9 |
| Ubuntu:22.04:LTS | pillow | no fix listed | UBUNTU-CVE-2026-112390 |
| Ubuntu:24.04:LTS | pillow | no fix listed | UBUNTU-CVE-2026-112390 |
| Ubuntu:26.04:LTS | pillow | no fix listed | UBUNTU-CVE-2026-112390 |
| Ubuntu:26.10 | pillow | no fix listed | UBUNTU-CVE-2026-112390 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| python-pillow | Pillow | >= 7.2.0, < 13.0.0 |
Weakness: CWE-835 · Vector: 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