CVE-2026-66758: A flaw was found in the file-fits plugin in GIMP

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HIGH 7.8WATCHLISTDOWNGRADEMITIGATE

CVE-2026-66758 is a high-severity flaw (CVSS 7.8) affecting gimp, enterprise linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in the file-fits plugin in GIMP. When processing a FITS image file, the plugin calculates memory allocation sizes using signed 32-bit integers for width and height. If a crafted file sets both values to large values, their product exceeds 2^31 and overflows, resulting in an undersized heap-based buffer allocation. This integer overflow issue results in a heap-based buffer overflow when cfitsio subsequently writes a full row of pi

Why this priority

High severity
Public exploit reference
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-190
Published	2026-07-27
Last modified	2026-10-12

Publisher (CNA): Red Hat, Inc. · Vendor: gimp · redhat

Last updated 2026-10-12 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-27 19:17 UTCPublished CVE record published
2026-10-12 03:17 UTCUpdated Record last modified

gimp gimp DOWNGRADE

Affected: 3.0.8 · 3.2.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.8

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.0.8 (Debian / Ubuntu)

apt-cache madison gimp sudo apt install gimp=<VERSION_BEFORE_3.0.8> sudo apt-mark hold gimp

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list gimp sudo dnf downgrade gimp-<VERSION_BEFORE_3.0.8> sudo dnf versionlock add gimp

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.

redhat enterprise linux MITIGATE

Affected: 6.0 · 7.0 · 8.0 · 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Advisories and coverage

Official advisories

AlmaLinux Errata: [ALSA-2026:50817] Important: gimp security update 2026-08-06

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-2026-66758?

gimp: downgrade or apply the listed mitigation; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-66758 being exploited?

CVE-2026-66758 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-2026-66758 affect?

CVE-2026-66758 affects gimp, enterprise linux. Severity is high (CVSS 7.8). A flaw was found in the file-fits plugin in GIMP. When processing a FITS image file, the plugin calculates memory allocation sizes using signed 32-bit integers for width and height. If a crafted file sets both values to large values, their

How urgent is CVE-2026-66758?

Priority 43/100. High severity; Public exploit reference; On your watchlist

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CVE-2026-40915 MEDIUM 5.5 MITIGATE MITIGATE A flaw was found in GIMP
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References

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