Vulnerability · Published Oct 19, 2026 · Assigned by GitHub_M
CVE-2026-112897Pillow: TiffDecode returns uninitialized memory as pixels for short JPEG strips
High 8.7
In plain English
A high-severity security flaw 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 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Pillow is a Python imaging library. From 5.3.0 until 13.0.0, Pillow can return uninitialized memory as pixels when libtiff performs a short decode of JPEG-compressed or Group 4 fax TIFF data. The _decodeStrip and _decodeTile buffers can be larger than the bytes written by libtiff, but Pillow converts the expected rows without clearing the unwritten tail. The tile path is affected from 5.3.0 and the strip path from 6.0.0. An attacker can supply a crafted TIFF to an application that loads and returns or re-encodes its pixels. This can disclose stale heap contents without memory corruption or a process crash. 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-2026-112897 |
| Debian:13 | pillow | no fix listed | DEBIAN-CVE-2026-112897 |
| Debian:14 | pillow | no fix listed | DEBIAN-CVE-2026-112897 |
| PyPI | pillow | 13.0.0 | GHSA-q45j-58j2-45rg |
| Ubuntu:22.04:LTS | pillow | no fix listed | UBUNTU-CVE-2026-112897 |
| Ubuntu:24.04:LTS | pillow | no fix listed | UBUNTU-CVE-2026-112897 |
| Ubuntu:26.04:LTS | pillow | no fix listed | UBUNTU-CVE-2026-112897 |
| Ubuntu:26.10 | pillow | no fix listed | UBUNTU-CVE-2026-112897 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| python-pillow | Pillow | >= 5.3.0, < 13.0.0 |
Weakness: CWE-908 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N