Bug 2479944 (CVE-2026-33633)

Summary: CVE-2026-33633 kitty: Kitty: Remote Code Execution via crafted APC graphics protocol command
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Kitty, a cross-platform GPU based terminal. A remote attacker, by sending a specially crafted APC graphics protocol command with a large PNG payload to the terminal's standard input (stdin), could trigger a heap buffer overflow in the `load_image_data()` function. This vulnerability allows the attacker to crash the terminal, leading to a Denial of Service (DoS), and potentially execute arbitrary code, achieving Remote Code Execution (RCE).
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Bug Depends On: 2479954    
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Description OSIDB Bzimport 2026-05-19 18:02:32 UTC 
Kitty is a cross-platform GPU based terminal. Versions 0.46.2 and below contain a heap buffer overflow in load_image_data() that allows any process which can write to the terminal's stdin to crash kitty immediately. The vulnerability is triggered by a single APC graphics protocol command with a PNG format declaration (f=100) whose payload exceeds twice the initial buffer capacity. The overflow is attacker-controlled in both length and content, causing DoS and potentially escalation to RCE itself. This issue has been fixed in version 0.47.0.