Vulnerability-Lookup

ubuntu-cve-2026-54055

Vulnerability from osv_ubuntu

Published

2026-06-12 20:16

Modified

2026-09-15 17:48

Summary

Details

Kitty is a cross-platform GPU based terminal. In versions prior to 0.47.2, a local privilege escalation vulnerability exists in kitty's file transmission protocol where a child process running in the terminal can write to arbitrary files on the filesystem by exploiting a TOCTOU (Time-of-Check-Time-of-Use) race condition between symlink validation and file creation. The os.open() call used to create files does not use O_NOFOLLOW, allowing an attacker to create a symlink between the initial stat check and the actual file open, causing the write to follow the symlink to an arbitrary destination. Version 0.47.2 fixes the issue.

Severity

5.0 (Medium)


                    
                      CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:L

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-54055	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-54055	REPORT
	https://github.com/kovidgoyal/kitty/security/advi…	REPORT
	https://ubuntu.com/security/notices/USN-8763-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "kitty",
            "binary_version": "0.32.2-1ubuntu0.4+esm2"
          },
          {
            "binary_name": "kitty-shell-integration",
            "binary_version": "0.32.2-1ubuntu0.4+esm2"
          },
          {
            "binary_name": "kitty-terminfo",
            "binary_version": "0.32.2-1ubuntu0.4+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "kitty",
        "purl": "pkg:deb/ubuntu/kitty@0.32.2-1ubuntu0.4+esm2?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.32.2-1ubuntu0.4+esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "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": "0.41.1-2+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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "kitty",
        "purl": "pkg:deb/ubuntu/kitty@0.41.1-2+deb13u1build0.25.10.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.39.1-1",
        "0.41.1-2",
        "0.41.1-2+deb13u1build0.25.10.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "kitty",
            "binary_version": "0.45.0-1ubuntu0.1~esm2"
          },
          {
            "binary_name": "kitty-shell-integration",
            "binary_version": "0.45.0-1ubuntu0.1~esm2"
          },
          {
            "binary_name": "kitty-terminfo",
            "binary_version": "0.45.0-1ubuntu0.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "kitty",
        "purl": "pkg:deb/ubuntu/kitty@0.45.0-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.45.0-1ubuntu0.1~esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "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"
      ]
    }
  ],
  "aliases": [],
  "details": "Kitty is a cross-platform GPU based terminal. In versions prior to 0.47.2, a local privilege escalation vulnerability exists in kitty\u0027s file transmission protocol where a child process running in the terminal can write to arbitrary files on the filesystem by exploiting a TOCTOU (Time-of-Check-Time-of-Use) race condition between symlink validation and file creation. The `os.open()` call used to create files does not use `O_NOFOLLOW`, allowing an attacker to create a symlink between the initial stat check and the actual file open, causing the write to follow the symlink to an arbitrary destination. Version 0.47.2 fixes the issue.",
  "id": "UBUNTU-CVE-2026-54055",
  "modified": "2026-09-15T17:48:36Z",
  "published": "2026-06-12T20:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-54055"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-54055"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/kovidgoyal/kitty/security/advisories/GHSA-q446-x7q6-vcxh"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8763-1"
    }
  ],
  "related": [
    "USN-8763-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-54055"
  ]
}

CVE-2026-54055 (GCVE-0-2026-54055)

Vulnerability from cvelistv5 – Published: 2026-06-12 20:03 – Updated: 2026-06-15 19:28

Title

Kitty has an Arbitrary File Write via Symlink Race Condition in File Transmission Protocol

Summary

Kitty is a cross-platform GPU based terminal. In versions prior to 0.47.2, a local privilege escalation vulnerability exists in kitty's file transmission protocol where a child process running in the terminal can write to arbitrary files on the filesystem by exploiting a TOCTOU (Time-of-Check-Time-of-Use) race condition between symlink validation and file creation. The `os.open()` call used to create files does not use `O_NOFOLLOW`, allowing an attacker to create a symlink between the initial stat check and the actual file open, causing the write to follow the symlink to an arbitrary destination. Version 0.47.2 fixes the issue.

Severity

5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:L

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-15 18:43 UTC

CWE

CWE-59 - Improper Link Resolution Before File Access ('Link Following')
CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-426 - Untrusted Search Path

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/kovidgoyal/kitty/security/advi…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
kovidgoyal	kitty	Affected: < 0.47.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-54055",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-15T18:43:37.469547Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-15T19:28:17.461Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/kovidgoyal/kitty/security/advisories/GHSA-q446-x7q6-vcxh"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "kitty",
          "vendor": "kovidgoyal",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.47.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Kitty is a cross-platform GPU based terminal. In versions prior to 0.47.2, a local privilege escalation vulnerability exists in kitty\u0027s file transmission protocol where a child process running in the terminal can write to arbitrary files on the filesystem by exploiting a TOCTOU (Time-of-Check-Time-of-Use) race condition between symlink validation and file creation. The `os.open()` call used to create files does not use `O_NOFOLLOW`, allowing an attacker to create a symlink between the initial stat check and the actual file open, causing the write to follow the symlink to an arbitrary destination. Version 0.47.2 fixes the issue."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "LOW",
            "baseScore": 5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-59",
              "description": "CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-367",
              "description": "CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-426",
              "description": "CWE-426: Untrusted Search Path",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-12T20:03:17.907Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/kovidgoyal/kitty/security/advisories/GHSA-q446-x7q6-vcxh",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/kovidgoyal/kitty/security/advisories/GHSA-q446-x7q6-vcxh"
        }
      ],
      "source": {
        "advisory": "GHSA-q446-x7q6-vcxh",
        "discovery": "UNKNOWN"
      },
      "title": "Kitty has an Arbitrary File Write via Symlink Race Condition in File Transmission Protocol"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-54055",
    "datePublished": "2026-06-12T20:03:17.907Z",
    "dateReserved": "2026-06-11T18:24:35.096Z",
    "dateUpdated": "2026-06-15T19:28:17.461Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

usn-8763-1

Vulnerability from osv_ubuntu

Published

2026-09-15 13:31

Modified

2026-09-15 13:31

Summary

kitty vulnerabilities

Details

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)

References

URL

Type

	https://ubuntu.com/security/notices/USN-8763-1	ADVISORY
	https://ubuntu.com/security/CVE-2026-42850	REPORT
	https://ubuntu.com/security/CVE-2026-42851	REPORT
	https://ubuntu.com/security/CVE-2026-54055	REPORT
	https://ubuntu.com/security/CVE-2026-54057	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-42850",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-42851",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-54055",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "kitty",
            "binary_version": "0.32.2-1ubuntu0.4+esm2"
          },
          {
            "binary_name": "kitty-shell-integration",
            "binary_version": "0.32.2-1ubuntu0.4+esm2"
          },
          {
            "binary_name": "kitty-terminfo",
            "binary_version": "0.32.2-1ubuntu0.4+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "kitty",
        "purl": "pkg:deb/ubuntu/kitty@0.32.2-1ubuntu0.4+esm2?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.32.2-1ubuntu0.4+esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "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"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-42850",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-42851",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-54055",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-54057",
              "severity": [
                {
                  "score": "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",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:26.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "kitty",
            "binary_version": "0.45.0-1ubuntu0.1~esm2"
          },
          {
            "binary_name": "kitty-shell-integration",
            "binary_version": "0.45.0-1ubuntu0.1~esm2"
          },
          {
            "binary_name": "kitty-terminfo",
            "binary_version": "0.45.0-1ubuntu0.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "kitty",
        "purl": "pkg:deb/ubuntu/kitty@0.45.0-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.45.0-1ubuntu0.1~esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "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"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that kitty incorrectly escaped error messages when\nhandling specially crafted terminal escape sequences. A remote attacker\ncould possibly use this issue to execute arbitrary commands.\n(CVE-2026-42850)\n\nIt was discovered that kitty incorrectly handled remote edit requests in\nterminal output. An attacker could possibly use this issue to execute\narbitrary code with the user\u0027s privileges.\n(CVE-2026-42851)\n\nThai Son Dinh and Nguyen Huy Vu Dung discovered that kitty incorrectly\nhandled destination paths in its file transmission protocol. A local\nattacker could possibly use this issue to overwrite arbitrary files with\nthe user\u0027s privileges.\n(CVE-2026-54055)\n\nIt was discovered that kitty incorrectly sanitized responses to color\nqueries. An attacker could possibly use this issue to execute arbitrary\ncommands with the user\u0027s privileges. This issue only affected Ubuntu\n26.04 LTS. (CVE-2026-54057)",
  "id": "USN-8763-1",
  "modified": "2026-09-15T13:31:45Z",
  "published": "2026-09-15T13:31:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8763-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-42850"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-42851"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-54055"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-54057"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "kitty vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-42850",
    "UBUNTU-CVE-2026-42851",
    "UBUNTU-CVE-2026-54055",
    "UBUNTU-CVE-2026-54057"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

ubuntu-cve-2026-54055

Vulnerability from osv_ubuntu

CVE-2026-54055 (GCVE-0-2026-54055)

usn-8763-1

Vulnerability from osv_ubuntu

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