CVE-2026-66758

Code execution via FITS allocation integer overflow

Published Jul 27, 2026 · Updated Jul 27, 2026

Heap-based buffer overflow in GIMP's file-fits plugin on Red Hat Enterprise Linux allows attackers to corrupt memory via a crafted FITS image. Signed 32-bit width and height values overflow during allocation-size multiplication, creating an undersized heap buffer before cfitsio writes a full pixel row. Exploitation requires a user to open the file; successful memory corruption crashes GIMP or executes code in that user's context, with SELinux, ASLR, and NX impeding code execution.

CVSS severity7.8
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in GIMP's file-fits plugin on Red Hat Enterprise Linux allows attackers to corrupt memory via a crafted FITS image. Signed 32-bit width and height values overflow during allocation-size multiplication, creating an undersized heap buffer before cfitsio writes a full pixel row. Exploitation requires a user to open the file; successful memory corruption crashes GIMP or executes code in that user's context, with SELinux, ASLR, and NX impeding code execution.

The record

CVE
CVE-2026-66758
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 6
Classifications
CWE-190, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat Enterprise Linux 6Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

7.8Red Hat, Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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