{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "39ab009a365b97632e9975e1266fa618c4bdc59f"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "range": [
                  {
                    "fixed": "42cf6decb926f56d606a76262791aaf071955d25"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "39ab009a365b97632e9975e1266fa618c4bdc59f"
            },
            {
              "fixed": "42cf6decb926f56d606a76262791aaf071955d25"
            }
          ],
          "repo": "https://github.com/openkermit/ckermit",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-c5px-7h4c-gj8p"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/129xxx/CVE-2026-129122.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "range": [
              {
                "introduced": "6.0.192"
              },
              {
                "fixed": "11.1.515"
              }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
          }
        ]
      },
      {
        "extracted_events": [
          {
            "range": [
              {
                "introduced": "6.0.192"
              },
              {
                "fixed": "11.1.515"
              }
            ],
            "source": "DESCRIPTION"
          }
        ]
      }
    ]
  },
  "details": "C-Kermit 6.0.192 before 11.1.515 contains a buffer overflow vulnerability in tn_snenv() in ckctel.c that allows malicious Telnet servers to corrupt client memory via crafted NEW-ENVIRON SEND subnegotiation. Malicious or machine-in-the-middle servers can send oversized variable names before authentication, overflowing a 16-byte stack buffer and a miscomputed heap buffer to corrupt stack and heap memory.",
  "id": "CVE-2026-129122",
  "modified": "2026-11-14T02:30:36.142799666Z",
  "published": "2026-11-13T16:23:44.625Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/129xxx/CVE-2026-129122.json"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/OpenKermit/ckermit/blob/v11.0.514/ckctel.c#L5622"
    },
    {
      "type": "FIX",
      "url": "https://github.com/OpenKermit/ckermit/commit/39ab009a365b97632e9975e1266fa618c4bdc59f"
    },
    {
      "type": "FIX",
      "url": "https://github.com/OpenKermit/ckermit/commit/42cf6decb926f56d606a76262791aaf071955d25"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/OpenKermit/ckermit/releases/tag/v11.1.515"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/OpenKermit/ckermit/security/advisories/GHSA-c5px-7h4c-gj8p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-129122"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/c-kermit-6.0.192-before-11.1.515-buffer-overflow-via-telnet-new-environ-negotiation"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "C-Kermit 6.0.192 before 11.1.515 Buffer Overflow via Telnet NEW-ENVIRON Negotiation"
}