CVE-2026-54058: Pillow is a Python imaging library

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CRITICAL 9.1REMOTEUPGRADE

CVE-2026-54058 is a critical-severity flaw (CVSS 9.1) 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. Prior to 12.3.0, when Pillow loads an uncompressed McIdas AREA image from a filename through the mmap raw codec path, attacker-controlled header words can set a row stride smaller than the natural row width, causing pixel access such as Image.tobytes(), getpixel, convert, or save to read beyond the mapped region and disclose adjacent process memory or fault. This issue is fixed in version 12.3.0.

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	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-07-14
Last modified	2026-10-24

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

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-14 17:17 UTCPublished CVE record published
2026-10-24 21:10 UTCUpdated Record last modified

python pillow UPGRADE

Affected: < 12.3.0

Fixed in: 12.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pillow || rpm -q pillow || pillow --version

2. UPGRADE to 12.3.0 (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.

Exact fixes by distribution

Python (pip) · pillow · FIXED · 12.3.0 · vulnerable: < 12.3.0 · source

pip install --upgrade "pillow>=12.3.0" pip show pillow

Fedora 46 · conda · FIXED · 26.9.4-2.fc46 · FEDORA-2026-09931756f1 · source

sudo dnf upgrade --advisory=FEDORA-2026-09931756f1

Debian 12 · pillow · NO FIX YET

Debian 13 · pillow · NO FIX YET

RHEL 8 · python-pillow · FIXED · python-pillow-5.1.1-23.el8_10

sudo dnf upgrade --advisory=RHSA-2026:48021 rpm -q python-pillow

RHEL 8.4 Advanced Mission Critical Update Support · python-pillow · FIXED · python-pillow-5.1.1-15.el8_4.2

sudo dnf upgrade --advisory=RHSA-2026:52551 rpm -q python-pillow

RHEL 8.4 Extended Update Support Long-Life Add-On · python-pillow · FIXED · python-pillow-5.1.1-15.el8_4.2

sudo dnf upgrade --advisory=RHSA-2026:52551 rpm -q python-pillow

RHEL 8.6 Advanced Mission Critical Update Support · python-pillow · FIXED · python-pillow-5.1.1-20.el8_6.1

sudo dnf upgrade --advisory=RHSA-2026:54528 rpm -q python-pillow

RHEL 8.6 Extended Update Support Long-Life Add-On · python-pillow · FIXED · python-pillow-5.1.1-20.el8_6.1

sudo dnf upgrade --advisory=RHSA-2026:54528 rpm -q python-pillow

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-2013 · source

sudo dnf update --advisory=ALAS2023-2026-2013

Amazon Linux 2 · see advisory · FIXED · ALAS2-2026-3839 · source

sudo yum update --advisory=ALAS2-2026-3839

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/python-pillow/Pillow/security/advisories/GHSA-62p4-gmf7-7g93

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-2026-54058?

pillow: upgrade to 12.3.0. Exact commands for each OS are on this page.

Is CVE-2026-54058 being exploited?

CVE-2026-54058 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-2026-54058 affect?

CVE-2026-54058 affects pillow. Severity is critical (CVSS 9.1). Pillow is a Python imaging library. Prior to 12.3.0, when Pillow loads an uncompressed McIdas AREA image from a filename through the mmap raw codec path, attacker-controlled header words can set a row stride smaller than the natural row wid

How urgent is CVE-2026-54058?

Priority 53/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

Related CVEs

CVE-2026-59197 HIGH 8.2 UPGRADE Pillow is a Python imaging library
CVE-2026-59199 HIGH 7.5 UPGRADE Pillow is a Python imaging library
CVE-2026-59204 HIGH 7.5 UPGRADE Pillow is a Python imaging library
CVE-2026-59205 HIGH 7.5 UPGRADE Pillow is a Python imaging library
CVE-2026-59200 HIGH 7.5 UPGRADE Pillow is a Python imaging library

References

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