CVE-2026-27809: psd-tools is a Python package for working with Adobe Photoshop PSD files

Q: How do I fix CVE-2026-27809?

psd-tools: upgrade to 1.12.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-27809 being exploited?

CVE-2026-27809 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-2026-27809 affect?

CVE-2026-27809 affects psd-tools. Severity is critical (CVSS 9.1). psd-tools is a Python package for working with Adobe Photoshop PSD files. Prior to version 1.12.2, when a PSD file contains malformed RLE-compressed image data (e.g. a literal run that extends past the expected row size), decode_rle() raise

Q: How urgent is CVE-2026-27809?

Priority 52/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-27809 is a critical-severity flaw (CVSS 9.1) affecting psd-tools. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

psd-tools is a Python package for working with Adobe Photoshop PSD files. Prior to version 1.12.2, when a PSD file contains malformed RLE-compressed image data (e.g. a literal run that extends past the expected row size), decode_rle() raises ValueError which propagated all the way to the user, crashing psd.composite() and psd-tools export. decompress() already had a fallback that replaces failed channels with black pixels when result is None, but

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 59%)
CISA exploited list	No
Weakness	CWE-190, CWE-409, CWE-617, CWE-704
Published	2026-02-26
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: psd-tools project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-26 00:16 UTCPublished CVE record published
2026-06-17 10:27 UTCUpdated Record last modified

psd-tools project psd-tools UPGRADE

Affected: < 1.12.2

Fixed in: 1.12.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy psd-tools || rpm -q psd-tools || psd-tools --version

2. UPGRADE to 1.12.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade psd-tools

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade psd-tools

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-2026-27809?

psd-tools: upgrade to 1.12.2. Exact commands for each OS are on this page.

Is CVE-2026-27809 being exploited?

CVE-2026-27809 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-2026-27809 affect?

CVE-2026-27809 affects psd-tools. Severity is critical (CVSS 9.1). psd-tools is a Python package for working with Adobe Photoshop PSD files. Prior to version 1.12.2, when a PSD file contains malformed RLE-compressed image data (e.g. a literal run that extends past the expected row size), decode_rle() raise

How urgent is CVE-2026-27809?

Priority 52/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

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References

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