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CVE-2026-54056— Kitty has an arbitrary file overwrite via symlink following in `kitten dnd` remote drop staging

Quick assessment

Affected
kovidgoyal kitty
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kovidgoyal kitty是Kovidgoyal个人开发者开源的一个基于Python的GPU终端仿真软件。 该软件可提供基本的终端功能,并且基于GPU渲染可降低系统负载,采用OpenGL进行渲染,可支持在Linux、Mac上使用。 kovidgoyal kitty 0.47.0版本至0.47.2之前版本存在后置链接漏洞，该漏洞源于 远程拖放暂存过程中未对符号链接进行去重，且文件写入操作未使用 标志，可能允许恶意远程拖放源利用符号链接写入暂存目录之外，进而覆

CVSS 7.6 · High EPSS 0.38% · P30

Affected Version Matrix 1

VendorProduct Version RangeStatus
kovidgoyal kitty >= 0.47.0, < 0.47.2 affected
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I. Basic Information for CVE-2026-54056

Vulnerability Information
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Vulnerability Title
Kitty has an arbitrary file overwrite via symlink following in `kitten dnd` remote drop staging
Source: CVE Program / CVE List V5
Vulnerability Description
Kitty is a cross-platform GPU based terminal. In versions 0.47.0 and 0.47.1, `kitten dnd` can allow a malicious remote drag-and-drop source to overwrite or truncate arbitrary files writable by the local kitty user. Remote `text/uri-list` drops are staged in a temporary directory, but on case-sensitive filesystems duplicate remote basenames are not de-duplicated. An attacker can first create a staged symlink and then send a same-name regular-file entry. The regular-file write uses `utils.CreateAt()` / `openat(O_RDWR|O_CREAT|O_TRUNC)` without `O_NOFOLLOW`, so it follows the attacker-created symlink and writes outside the staging directory before final overwrite confirmation runs. This appears related in class to the file-transfer symlink advisory, but it is a different bug: it affects `kitten dnd` remote drag-and-drop staging, uses different vulnerable code (`kittens/dnd/drop.go` and `tools/utils/file_at_fd.go`), and reproduces on commit `4aa4a5c0567a92553a8c20a88a4352da637fca5d`, after the file-transfer `O_NOFOLLOW` fix. Version 0.47.2 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
Kovidgoyal kitty 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kovidgoyal kitty是Kovidgoyal个人开发者开源的一个基于Python的GPU终端仿真软件。 该软件可提供基本的终端功能,并且基于GPU渲染可降低系统负载,采用OpenGL进行渲染,可支持在Linux、Mac上使用。 kovidgoyal kitty 0.47.0版本至0.47.2之前版本存在后置链接漏洞，该漏洞源于`kitten dnd`远程拖放暂存过程中未对符号链接进行去重，且文件写入操作未使用`O_NOFOLLOW`标志，可能允许恶意远程拖放源利用符号链接写入暂存目录之外，进而覆
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
kovidgoyal kitty >= 0.47.0, < 0.47.2 -

II. Public POCs for CVE-2026-54056

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9703 chars
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III. Intelligence Information for CVE-2026-54056

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Vendor Advisories for CVE-2026-54056 (1)

Same Patch Batch · kovidgoyal · 2026-06-12 · 5 CVEs total

CVE-2026-42851 7.8 HIGH @kitty-edit DCS + --color=geninclude vulnerable to Unauthenticated in-process RCE
CVE-2026-54055 5.0 MEDIUM Kitty has an Arbitrary File Write via Symlink Race Condition in File Transmission Protocol
CVE-2026-42850 Kitty has a shell command injection
CVE-2026-54057 Kitty vulnerable to command injection via unsanitized OSC 21 query reply

IV. Related Vulnerabilities

Same product: kitty
Same vendor: kovidgoyal
Same weakness: CWE-59

V. Comments for CVE-2026-54056

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