UBUNTU-CVE-2026-54056

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Source
https://ubuntu.com/security/CVE-2026-54056
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54056.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-54056
Upstream
Published
2026-06-12T21:16:00Z
Modified
2026-06-22T09:32:42.942568320Z
Severity
  • 7.6 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:L CVSS Calculator
  • 7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:Pro:20.04:LTS / kitty

Package

Name
kitty
Purl
pkg:deb/ubuntu/kitty?arch=source&distro=esm-apps%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.14.3-1
0.14.4-1
0.14.6-1
0.15.0-1
0.15.0-1build1
0.15.0-1ubuntu0.2
0.15.0-1ubuntu0.2+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "kitty",
            "binary_version": "0.15.0-1ubuntu0.2+esm1"
        },
        {
            "binary_name": "kitty-terminfo",
            "binary_version": "0.15.0-1ubuntu0.2+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54056.json"

Ubuntu:Pro:22.04:LTS / kitty

Package

Name
kitty
Purl
pkg:deb/ubuntu/kitty?arch=source&distro=esm-apps%2Fjammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.19.3-1
0.21.2-1
0.21.2-1build1
0.21.2-1ubuntu0.22.04.1
0.21.2-1ubuntu0.22.04.1+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "kitty",
            "binary_version": "0.21.2-1ubuntu0.22.04.1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54056.json"

Ubuntu:Pro:24.04:LTS / kitty

Package

Name
kitty
Purl
pkg:deb/ubuntu/kitty?arch=source&distro=esm-apps%2Fnoble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.26.5-3ubuntu2
0.26.5-5ubuntu1
0.31.0-3
0.31.0-4
0.32.2-1
0.32.2-1build2
0.32.2-1build3
0.32.2-1ubuntu0.1
0.32.2-1ubuntu0.2
0.32.2-1ubuntu0.3
0.32.2-1ubuntu0.4
0.32.2-1ubuntu0.4+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "kitty",
            "binary_version": "0.32.2-1ubuntu0.4+esm1"
        },
        {
            "binary_name": "kitty-shell-integration",
            "binary_version": "0.32.2-1ubuntu0.4+esm1"
        },
        {
            "binary_name": "kitty-terminfo",
            "binary_version": "0.32.2-1ubuntu0.4+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54056.json"

Ubuntu:25.10 / kitty

Package

Name
kitty
Purl
pkg:deb/ubuntu/kitty?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.39.1-1
0.41.1-2
0.41.1-2+deb13u1build0.25.10.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "kitty",
            "binary_version": "0.41.1-2+deb13u1build0.25.10.1"
        },
        {
            "binary_name": "kitty-shell-integration",
            "binary_version": "0.41.1-2+deb13u1build0.25.10.1"
        },
        {
            "binary_name": "kitty-terminfo",
            "binary_version": "0.41.1-2+deb13u1build0.25.10.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54056.json"

Ubuntu:Pro:26.04:LTS / kitty

Package

Name
kitty
Purl
pkg:deb/ubuntu/kitty?arch=source&distro=esm-apps%2Fresolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.41.1-2
0.43.1-1
0.44.0-1
0.45.0-1
0.45.0-1build1
0.45.0-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "kitty",
            "binary_version": "0.45.0-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "kitty-shell-integration",
            "binary_version": "0.45.0-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "kitty-terminfo",
            "binary_version": "0.45.0-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54056.json"