LibreTranslate - IP Spoofing via X-Forwarded-For Header

{
  "id": "fbe451271f39900f79512104adf225ce83abfe788b9043d1f3cdae2dfd984e25",
  "url": "https://osv.dev/vulnerability/CVE-2026-57942",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "LibreTranslate - IP Spoofing via X-Forwarded-For Header",
    "summary": "LibreTranslate through 1.9.7, fixed in commit 397fd22, contains an IP spoofing vulnerability in the get_remote_address() function that allows unauthenticated attackers to spoof client IP addresses by injecting arbitrary values into the X-Forwarded-For header without trusted proxy validation. Attackers can bypass per-IP rate limiting and flood bans by supplying forged addresses in the X-Forwarded-For header to enable unlimited API abuse.",
    "evidence": "osv:CVE-2026-57942",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-57942",
      "aliases": [
        "CVE-2026-57942"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/libretranslate/libretranslate",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "397fd22"
                },
                {
                  "fixed": "397fd224080515d4001a1bc60c8fed53e3c56b6f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "397fd22"
                      }
                    ],
                    "source": "DESCRIPTION"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "397fd22"
                      }
                    ],
                    "source": "DESCRIPTION"
                  },
                  {
                    "range": [
                      {
                        "fixed": "397fd224080515d4001a1bc60c8fed53e3c56b6f"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.9.6",
            "v1.9.5",
            "v1.9.4",
            "v1.9.3",
            "v1.9.2",
            "v1.9.1",
            "v1.9.0",
            "v1.8.4",
            "v1.8.3",
            "v1.8.2",
            "v1.8.1",
            "v1.8.0",
            "v1.7.3",
            "v1.7.2",
            "v1.6.5",
            "v1.6.4",
            "v1.6.3",
            "v1.6.2",
            "v1.6.1",
            "v1.6.0",
            "v1.5.7",
            "v1.5.6",
            "v1.5.5",
            "v1.5.4",
            "v1.5.3",
            "v1.5.2",
            "v1.5.1",
            "v1.5.0",
            "v1.4.1",
            "v1.3.13",
            "v1.3.12",
            "v1.3.11",
            "v1.3.10",
            "v1.3.9",
            "v1.3.8",
            "v1.3.7",
            "v1.3.6",
            "v1.3.5",
            "v1.3.4",
            "v1.3.3",
            "v1.3.2",
            "v1.3.1",
            "v1.3.0",
            "v1.2.9",
            "v1.2.8",
            "v1.2.7",
            "v1.2.5",
            "v1.2.4",
            "v1.2.3",
            "v1.2.2",
            "v1.2.0",
            "v1.1.0",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-57942.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.028018214Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57942.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-57942",
        "https://www.vulncheck.com/advisories/libretranslate-ip-spoofing-via-x-forwarded-for-header",
        "https://github.com/LibreTranslate/LibreTranslate/issues/986",
        "https://github.com/LibreTranslate/LibreTranslate/pull/987",
        "https://github.com/LibreTranslate/LibreTranslate/commit/397fd224080515d4001a1bc60c8fed53e3c56b6f",
        "https://github.com/LibreTranslate/LibreTranslate"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-348"
        ],
        "cna_assigner": "VulnCheck",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "1.9.7"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "1.9.7"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57942.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-57942",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494876,
  "published_at": "2026-06-29T17:17:09.639+00:00"
}