kitty — security advisory

{
  "id": "fb2586734325b56f45080d03e1ee9c739c1a5af0f44f36f2a6717578bedbaecf",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-54056",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-54056",
    "summary": "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.",
    "evidence": "osv:DEBIAN-CVE-2026-54056",
    "products": [
      {
        "name": {
          "value": "kitty",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.47.3-1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "0.41.1-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.42.1-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.42.2-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.43.1-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.44.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.45.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.45.0-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.46.1-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.46.2-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.47.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.47.0-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.47.0-3",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "DEBIAN-CVE-2026-54056",
      "aliases": [
        "DEBIAN-CVE-2026-54056"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.47.3-1"
                }
              ]
            }
          ],
          "package": {
            "name": "kitty",
            "purl": "pkg:deb/debian/kitty?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "0.41.1-2",
            "0.42.1-1",
            "0.42.2-1",
            "0.43.1-1",
            "0.44.0-1",
            "0.45.0-1",
            "0.45.0-2",
            "0.46.1-1",
            "0.46.2-1",
            "0.47.0-1",
            "0.47.0-2",
            "0.47.0-3"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54056.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-26T11:47:28.731560103Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-54056"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-54056"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-54056",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 450785,
  "published_at": "2026-06-12T21:16:24.463+00:00"
}