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Ubuntu Security NoticesUSN-8763-1

USN-8763-1: kitty vulnerabilities

It was discovered that kitty incorrectly escaped error messages when handling specially crafted terminal escape sequences. A remote attacker could possibly use this issue to execute arbitrary commands. (CVE-2026-42850) It was discovered that kitty incorrectly handled remote edit requests in terminal output. An attacker could possibly use this issue to execute arbitrary code with the user's privileges. (CVE-2026-42851) Thai Son Dinh and Nguyen Huy Vu Dung discovered that kitty incorrectly handled destination paths in its file transmission protocol. A local attacker could possibly use this issue to overwrite arbitrary files with the user's privileges. (CVE-2026-54055) It was discovered that kitty incorrectly sanitized responses to color queries. An attacker could possibly use this issue to execute arbitrary commands with the user's privileges. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-54057)

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Scope

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Timeline

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  1. Published by Ubuntu

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  2. Added to SecurityAlert

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  3. Confirmed at the source

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Vulnerabilities

CVEs named in this advisory

CVE-2026-42850View CVSS, KEV, EPSS, and threat contextCVE-2026-42851View CVSS, KEV, EPSS, and threat contextCVE-2026-54055View CVSS, KEV, EPSS, and threat contextCVE-2026-54057View CVSS, KEV, EPSS, and threat context
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