EUVD-2026-64935
GHSA-944m-78f8-q7cr
Severity by source
AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
AV:L reflects local file processing with no network service; AC:H captures the 32-bit-only architectural constraint and heap exploitation difficulty; UI:R because the victim must actively open the crafted PCX file.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
A flaw was found in the file-pcx plugin in GIMP, affecting 32-bit builds only. When processing a PCX image file, the plugin calculates memory allocation sizes based on the image dimensions and the number of color planes. If a crafted file sets the number of planes to 4 alongside sufficiently large dimensions, the calculation exceeds the 32-bit integer limit and overflows, resulting in an undersized heap-based buffer allocation. This integer overflow issue results in a heap-based buffer overflow when the plugin subsequently writes image data into the undersized buffer, causing memory corruption, potentially leading to arbitrary code execution or a denial of service.
AnalysisAI
Integer overflow in GIMP's file-pcx plugin on 32-bit builds enables a heap-based buffer overflow when a user opens a specially crafted PCX image, potentially leading to arbitrary code execution or denial of service. The flaw is architecturally constrained to 32-bit builds - 64-bit installations are unaffected - and exploitation additionally requires user interaction to open the malicious file. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target to be running a 32-bit GIMP build - this is the single most restrictive prerequisite, as 64-bit builds (the default in virtually all modern Linux distributions) are not affected. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.0 (High) is derived from AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a PCX image file specifying four color planes and oversized dimensions calculated to trigger the 32-bit wraparound, then delivers it to a target via phishing email, malicious download link, or shared network storage. A user on a 32-bit GIMP installation opens the file, causing the plugin to allocate an undersized heap buffer and overwrite adjacent heap memory with attacker-influenced image data; with sufficient control of heap layout, this can redirect execution to attacker-controlled code running under the victim user's privileges. … |
| Remediation | Monitor Red Hat security advisories at https://access.redhat.com/security/cve/CVE-2026-78465 and apply RHEL errata updates for the GIMP package as they are released - no specific patched GIMP version number has been confirmed in available input data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an inventory of all 32-bit GIMP installations and identify systems regularly used to process image files from external sources. …
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External POC / Exploit Code
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