CVE-2026-112393: Pillow is a Python imaging library

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CRITICAL 9.8REMOTEUPGRADE

CVE-2026-112393 is a critical-severity flaw (CVSS 9.8) 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 2.0.0 until 13.0.0, Pillow has a heap buffer overflow and stale-heap disclosure in _tiffWriteProc when saving compressed TIFF data through libtiff to a target without a usable fileno(), such as BytesIO. The callback sizes its allocation from the prior buffer size instead of the current write position, allowing an attacker-controlled out-of-line TIFF tag or retained ICC profile to be copied beyond the alloc

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-122
Published	2026-10-19
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: python

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-19 21:17 UTCPublished CVE record published
2026-10-26 21:01 UTCUpdated Record last modified

python pillow UPGRADE

Affected: >= 2.0.0 and < 13.0.0

Fixed in: 13.0.0

Safe to downgrade to: a release before 2.0.0

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 2.0.0 (Debian / Ubuntu)

apt-cache madison pillow sudo apt install pillow=<VERSION_BEFORE_2.0.0> 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_2.0.0> 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: >= 2.0.0, < 13.0.0 · source

pip install --upgrade "Pillow>=13.0.0" pip show Pillow

Fedora ELN · openbao · FIXED · 2.6.5-1.eln159 · FEDORA-2026-77adf886ae · source

sudo dnf upgrade --advisory=FEDORA-2026-77adf886ae

Fedora 46 · sugar-turtleart · FIXED · 220-16.fc46 · FEDORA-2026-b79483c788 · source

sudo dnf upgrade --advisory=FEDORA-2026-b79483c788

Debian 12 · pillow · NO FIX YET

Debian 13 · pillow · 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.

Quick answers

How do I fix CVE-2026-112393?

pillow: upgrade to 13.0.0. Exact commands for each OS are on this page.

Is CVE-2026-112393 being exploited?

CVE-2026-112393 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-112393 affect?

CVE-2026-112393 affects pillow. Severity is critical (CVSS 9.8). Pillow is a Python imaging library. From 2.0.0 until 13.0.0, Pillow has a heap buffer overflow and stale-heap disclosure in _tiffWriteProc when saving compressed TIFF data through libtiff to a target without a usable fileno(), such as Bytes

How urgent is CVE-2026-112393?

Priority 59/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

Related CVEs

CVE-2026-40192 HIGH 7.5 UPGRADE Pillow is a Python imaging library
CVE-2026-112394 HIGH 8.2 UPGRADE Pillow is a Python imaging library
CVE-2026-112396 MEDIUM 5.9 UPGRADE Pillow is a Python imaging library
CVE-2026-112392 HIGH 7.5 UPGRADE Pillow is a Python imaging library
CVE-2026-112395 MEDIUM 6.5 UPGRADE Pillow is a Python imaging library

References

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