Xz: malicious code in distributed source

{
  "id": "91bdbefc46d4663cebd1a539f2a83909b84f9482b16e4b2c0a63b1ca97a384e3",
  "url": "https://osv.dev/vulnerability/CVE-2024-3094",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Xz: malicious code in distributed source",
    "summary": "Malicious code was discovered in the upstream tarballs of xz, starting with version 5.6.0. Through a series of complex obfuscations, the liblzma build process extracts a prebuilt object file from a disguised test file existing in the source code, which is then used to modify specific functions in the liblzma code. This results in a modified liblzma library that can be used by any software linked against this library, intercepting and modifying the data interaction with this library.",
    "evidence": "osv:CVE-2024-3094",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2024-3094",
      "aliases": [
        "CVE-2024-3094",
        "GHSA-rxwq-x6h5-x525"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/tukaani-project/xz",
              "type": "GIT",
              "events": [
                {
                  "introduced": "2d7d862e3ffa8cec4fd3fdffcd84e984a17aa429"
                },
                {
                  "last_affected": "fd1b975b7851e081ed6e5cf63df946cd5cbdbb94"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "5.6.0"
                      },
                      {
                        "last_affected": "5.6.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "5.6.1"
                      },
                      {
                        "last_affected": "5.6.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "cpe": "cpe:2.3:a:tukaani:xz:5.6.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.6.0"
                      },
                      {
                        "last_affected": "5.6.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:tukaani:xz:5.6.1:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.6.1"
                      },
                      {
                        "last_affected": "5.6.1"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "5.6.0",
            "5.6.1",
            "v5.6.1",
            "v5.6.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-3094.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.962780903Z",
      "provider": "osv",
      "references": [
        "https://access.redhat.com/downloads/content/package-browser/",
        "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
        "https://ariadne.space/2024/04/02/the-xz-utils-backdoor-is-a-symptom-of-a-larger-problem/",
        "https://arstechnica.com/security/2024/03/backdoor-found-in-widely-used-linux-utility-breaks-encrypted-ssh-connections/",
        "https://aws.amazon.com/security/security-bulletins/AWS-2024-002/",
        "https://boehs.org/node/everything-i-know-about-the-xz-backdoor",
        "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1068024",
        "https://bugs.gentoo.org/928134",
        "https://discourse.nixos.org/t/cve-2024-3094-malicious-code-in-xz-5-6-0-and-5-6-1-tarballs/42405",
        "https://gist.github.com/thesamesam/223949d5a074ebc3dce9ee78baad9e27",
        "https://gynvael.coldwind.pl/?lang=en&id=782",
        "https://lists.debian.org/debian-security-announce/2024/msg00057.html",
        "https://lists.freebsd.org/archives/freebsd-security/2024-March/000248.html",
        "https://lwn.net/Articles/967180/",
        "https://news.ycombinator.com/item?id=39865810",
        "https://news.ycombinator.com/item?id=39877267",
        "https://news.ycombinator.com/item?id=39895344",
        "https://research.swtch.com/xz-script",
        "https://research.swtch.com/xz-timeline",
        "https://security-tracker.debian.org/tracker/CVE-2024-3094",
        "https://security.alpinelinux.org/vuln/CVE-2024-3094",
        "https://security.archlinux.org/CVE-2024-3094",
        "https://tukaani.org/xz-backdoor/",
        "https://twitter.com/LetsDefendIO/status/1774804387417751958",
        "https://twitter.com/debian/status/1774219194638409898",
        "https://twitter.com/infosecb/status/1774595540233167206",
        "https://twitter.com/infosecb/status/1774597228864139400",
        "https://ubuntu.com/security/CVE-2024-3094",
        "https://www.cisa.gov/news-events/alerts/2024/03/29/reported-supply-chain-compromise-affecting-xz-utils-data-compression-library-cve-2024-3094",
        "https://www.darkreading.com/vulnerabilities-threats/are-you-affected-by-the-backdoor-in-xz-utils",
        "https://www.openwall.com/lists/oss-security/2024/03/29/4",
        "https://www.theregister.com/2024/03/29/malicious_backdoor_xz/",
        "https://www.vicarius.io/vsociety/vulnerabilities/cve-2024-3094",
        "https://xeiaso.net/notes/2024/xz-vuln/",
        "https://access.redhat.com/security/cve/CVE-2024-3094",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/3xxx/CVE-2024-3094.json",
        "https://github.com/advisories/GHSA-rxwq-x6h5-x525",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-3094",
        "https://security.netapp.com/advisory/ntap-20240402-0001/",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2272210",
        "https://bugzilla.suse.com/show_bug.cgi?id=1222124",
        "https://github.com/amlweems/xzbot",
        "https://github.com/karcherm/xz-malware",
        "https://github.com/tukaani-project/xz",
        "https://blog.netbsd.org/tnf/entry/statement_on_backdoor_in_xz",
        "https://openssf.org/blog/2024/03/30/xz-backdoor-cve-2024-3094/",
        "https://www.binarly.io/blog/persistent-risk-xz-utils-backdoor-still-lurking-in-docker-images",
        "https://www.kali.org/blog/about-the-xz-backdoor/",
        "https://www.redhat.com/en/blog/urgent-security-alert-fedora-41-and-rawhide-users",
        "https://www.tenable.com/blog/frequently-asked-questions-cve-2024-3094-supply-chain-backdoor-in-xz-utils"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-506"
        ],
        "cna_assigner": "redhat",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/3xxx/CVE-2024-3094.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-3094",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521870,
  "published_at": "2024-03-29T16:51:12.588+00:00"
}