Bug 2508367 (CVE-2026-50642)

Summary: CVE-2026-50642 diff-so-fancy: diff-so-fancy: Terminal escape injection allows command execution
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in diff-so-fancy. The application does not properly sanitize non-SGR (Select Graphic Rendition) terminal control sequences, allowing other control characters and escape sequences to pass through. An attacker can embed malicious control sequences in filenames, diff metadata, or file content, which are then rendered directly in the terminal when a user views the diff. This can lead to output manipulation, including filename spoofing and terminal screen clearing, and may result in unintended command execution through clipboard hijacking, potentially misleading users during code review.
 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: 2508640, 2508641    
Bug Blocks:    

Description OSIDB Bzimport 2026-07-29 11:01:21 UTC 
diff‑so‑fancy does not properly sanitize non‑SGR terminal control sequences before outputting diff data. The application only strips ANSI SGR sequences while allowing other control characters, including carriage return (\r) and escape sequences (e.g., OSC, CSI), to pass through unsanitized.

An attacker can embed malicious control sequences in filenames, diff metadata, or file content that are rendered directly in the terminal during diff viewing. This can lead to output manipulation, including filename spoofing, terminal screen clearing, and clipboard injection via supported escape sequences.

Successful exploitation may mislead users during code review, alter terminal state, or result in unintended command execution through clipboard hijacking.

This issue has been fixed in the commit 9c81294