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CVE-2026-66758— Gimp: integer overflow in file-fits plugin causes a heap-based buffer overflow on crafted fits images

Quick assessment

Affected
GNOME GIMP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GNOME GIMP是GNOME基金会的一款图像编辑软件。 GNOME GIMP存在数字错误漏洞，该漏洞源于file-fits插件处理FITS图像文件时使用有符号32位整数计算内存分配大小，整数溢出导致堆缓冲区分配不足，cfitsio写入整行像素时触发堆缓冲区溢出，可能导致任意代码执行或拒绝服务。

CVSS 7.8 · High EPSS 0.36% · P27

Affected Version Matrix 6

VendorProduct Version RangeStatus
GNOME GIMP any affected
Red Hat Red Hat Enterprise Linux 6 any affected
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 8100020260824165450.4c9c024f< * unaffected
Red Hat Red Hat Enterprise Linux 9 2:3.0.4-4.el9_8.9< * unaffected
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 2:2.99.8-4.el9_6.20< * unaffected
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I. Basic Information for CVE-2026-66758

Vulnerability Information
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Vulnerability Title
Gimp: integer overflow in file-fits plugin causes a heap-based buffer overflow on crafted fits images
Source: CVE Program / CVE List V5
Vulnerability Description
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 pixels in the buffer, causing memory corruption, potentially leading to arbitrary code execution or a denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
GNOME GIMP 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNOME GIMP是GNOME基金会的一款图像编辑软件。 GNOME GIMP存在数字错误漏洞，该漏洞源于file-fits插件处理FITS图像文件时使用有符号32位整数计算内存分配大小，整数溢出导致堆缓冲区分配不足，cfitsio写入整行像素时触发堆缓冲区溢出，可能导致任意代码执行或拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GNOME GIMP - -
Red Hat Red Hat Enterprise Linux 8 8100020260824165450.4c9c024f ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat Red Hat Enterprise Linux 9 2:3.0.4-4.el9_8.9 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 2:2.99.8-4.el9_6.20 ~ * cpe:/a:redhat:rhel_eus:9.6::appstream
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7

II. Public POCs for CVE-2026-66758

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III. Intelligence Information for CVE-2026-66758

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Vendor Advisories for CVE-2026-66758 (6)

Same Patch Batch · GNOME · 2026-07-27 · 3 CVEs total

CVE-2026-66759 7.1 HIGH Gimp: out-of-bounds read in file-icns plugin causes information disclosure or crash on cra
CVE-2026-66757 5.5 MEDIUM Gimp: signed integer overflow in file-sgi (sgi-lib) causes the plugin to crash on rle sgi

IV. Related Vulnerabilities

Same product: GIMP
Same vendor: GNOME
Same weakness: CWE-190

V. Comments for CVE-2026-66758

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