PatchTheCVECVE-2026-112391: Pillow is a Python imaging library
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HIGH 7.5REMOTEUPGRADE
CVE-2026-112391 is a high-severity flaw (CVSS 7.5) affecting pillow. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Pillow is a Python imaging library. From 5.1.0 until 13.0.0, Pillow's PdfParser.get_value() can recurse without a limit while reading nested PDF objects. The parser follows attacker-controlled arrays and dictionaries when an existing PDF is opened for append. An attacker can provide a deeply nested PDF to an application that saves an image with PDF append enabled. This can raise an uncaught RecursionError or terminate the worker, causing denial o
Why this priority
- High severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 79%) |
| CISA exploited list | No |
| Weakness | CWE-835 |
| Published | 2026-10-19 |
| Last modified | 2026-10-23 |
Publisher (CNA): GitHub, Inc. · Vendor: python
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
python pillow UPGRADE
Affected: >= 5.1.0 and < 13.0.0
Fixed in: 13.0.0
Safe to downgrade to: a release before 5.1.0
1. Check installed version
apt-cache policy pillow || rpm -q pillow || pillow --version
2. UPGRADE to 13.0.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade pillow
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade pillow
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 5.1.0 (Debian / Ubuntu)
apt-cache madison pillow
sudo apt install pillow=<VERSION_BEFORE_5.1.0>
sudo apt-mark hold pillow
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list pillow
sudo dnf downgrade pillow-<VERSION_BEFORE_5.1.0>
sudo dnf versionlock add pillow
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Exact fixes by distribution
Python (pip) · Pillow · FIXED · 13.0.0 · vulnerable: >= 5.1.0, < 13.0.0 · source
pip install --upgrade "Pillow>=13.0.0"
pip show Pillow
Fedora 46 · kwin-zones · FIXED · 1.0.13-1.fc46 · FEDORA-2026-95888f332b · source
sudo dnf upgrade --advisory=FEDORA-2026-95888f332b
Fedora ELN · nginx-mod-brotli · FIXED · 1.0.0~rc-16.eln159 · FEDORA-2026-501a6a8273 · source
sudo dnf upgrade --advisory=FEDORA-2026-501a6a8273
Debian 12 · pillow · NO FIX YET
Debian 13 · pillow · NO FIX YET
RHEL 8 · python-pillow · NO FIX YET
RHEL AI (RHEL AI) 3 · rhelai3/bootc-aws-cuda-rhel9 · NO FIX YET
RHEL AI (RHEL AI) 3 · rhelai3/bootc-azure-cuda-rhel9 · NO FIX YET
RHEL AI (RHEL AI) 3 · rhelai3/bootc-azure-rocm-rhel9 · NO FIX YET
RHEL AI (RHEL AI) 3 · rhelai3/bootc-cuda-rhel9 · NO FIX YET
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Related CVEs
- CVE-2026-112390 HIGH 7.5 UPGRADE Pillow is a Python imaging library