Bug 2533013 (CVE-2026-90949)

Summary: CVE-2026-90949 gimp: gimp: heap-based buffer overflow in PSP loader due to selection-channel geometry mismatch
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in GIMP's PSP (Paint Shop Pro) file loader. When processing a compressed selection channel, a heap-based buffer overflow can occur due to a mismatch between the allocated buffer size and the amount of data decompressed. A remote attacker could exploit this vulnerability by crafting a malicious PSP file. Opening this file in GIMP could lead to a crash or arbitrary code execution.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2533138    
Bug Blocks:    

Description OSIDB Bzimport 2026-09-14 12:35:28 UTC 
A heap-based buffer overflow flaw was found in GIMP's PSP (Paint Shop Pro) file loader. When processing a compressed selection channel, read_selection_block() allocates a buffer sized to the selection rectangle's dimensions, while read_channel_data() derives the amount of data to decompress from the full image dimensions instead. A specially crafted PSP file can exploit this mismatch to decompress data far exceeding the allocated buffer, causing a heap-based buffer overflow. An attacker could exploit this by crafting a malicious PSP file that, when opened in GIMP, leads to a crash or arbitrary code execution in the context of the user running GIMP.