CVE-2026-42308: Pillow is a Python imaging library

Q: How do I fix CVE-2026-42308?

pillow: upgrade to 12.2.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-42308 being exploited?

CVE-2026-42308 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-42308 affect?

CVE-2026-42308 affects pillow. Severity is medium (CVSS 5.5). Pillow is a Python imaging library. Prior to version 12.2.0, if a font advances for each glyph by an exceeding large amount, when Pillow keeps track of the current position, it may lead to an integer overflow. This issue has been patched in

Q: How urgent is CVE-2026-42308?

Priority 20/100. No elevated risk signals yet.

Routine

MEDIUM 5.5UPGRADE

CVE-2026-42308 is a medium-severity flaw (CVSS 5.5) 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. Prior to version 12.2.0, if a font advances for each glyph by an exceeding large amount, when Pillow keeps track of the current position, it may lead to an integer overflow. This issue has been patched in version 12.2.0.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-190
Published	2026-05-09
Last modified	2026-07-24

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

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-09 06:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

python pillow UPGRADE

Affected: < 12.2.0

Fixed in: 12.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 12.2.0 (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.

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-2026-42308?

pillow: upgrade to 12.2.0. Exact commands for each OS are on this page.

Is CVE-2026-42308 being exploited?

CVE-2026-42308 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-2026-42308 affect?

CVE-2026-42308 affects pillow. Severity is medium (CVSS 5.5). Pillow is a Python imaging library. Prior to version 12.2.0, if a font advances for each glyph by an exceeding large amount, when Pillow keeps track of the current position, it may lead to an integer overflow. This issue has been patched in

How urgent is CVE-2026-42308?

Priority 20/100. No elevated risk signals yet.

Software pages

Python vulnerabilities

Related CVEs

CVE-2026-112403 CRITICAL 9.8 UPGRADE Pillow is a Python imaging library
CVE-2026-112404 HIGH 8.2 UPGRADE Pillow is a Python imaging library
CVE-2026-112405 HIGH 7.5 UPGRADE Pillow is a Python imaging library
CVE-2026-112406 HIGH 7.5 UPGRADE Pillow is a Python imaging library
CVE-2026-112891 HIGH 7.5 UPGRADE Pillow is a Python imaging library

References

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