Security advisory

{
  "id": "c3ce6c93f6602fbf8e1e75195b2f2efd87e8a44020e84e56c4f901a859227530",
  "url": "https://osv.dev/vulnerability/CVE-2018-1000159",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-1000159",
    "summary": "tlslite-ng version 0.7.3 and earlier, since commit d7b288316bca7bcdd082e6ccff5491e241305233 contains a CWE-354: Improper Validation of Integrity Check Value vulnerability in TLS implementation, tlslite/utils/constanttime.py: ct_check_cbc_mac_and_pad(); line \"end_pos = data_len - 1 - mac.digest_size\" that can result in an attacker manipulating the TLS ciphertext which will not be detected by receiving tlslite-ng. This attack appears to be exploitable via man in the middle on a network connection. This vulnerability appears to have been fixed after commit 3674815d1b0f7484454995e2737a352e0a6a93d8.",
    "evidence": "osv:CVE-2018-1000159",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2018-1000159",
      "aliases": [
        "CVE-2018-1000159",
        "GHSA-cwh5-3cw7-4286",
        "PYSEC-2018-31"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/tlsfuzzer/tlslite-ng",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "2f24f4edf4645aa6ae597aa768fb9ba7da686a7f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:tlslite-ng_project:tlslite-ng:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.7.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.7.3",
            "v0.7.2",
            "v0.7.1",
            "v0.7.0",
            "v0.7.0-beta1",
            "v0.7.0-alpha9",
            "v0.7.0-alpha8",
            "v0.7.0-alpha7",
            "v0.7.0-alpha6",
            "v0.7.0-alpha5",
            "v0.7.0-alpha4",
            "v0.7.0-alpha3",
            "v0.7.0-alpha2",
            "v0.7.0-alpha1",
            "v0.6.0",
            "v0.6.0-beta1",
            "v0.6.0-alpha5",
            "v0.6.0-alpha4",
            "v0.5.1",
            "v0.6.0-alpha3",
            "v0.6.0-alpha2",
            "v0.6.0-alpha1",
            "v0.5.0",
            "v0.5.0-beta6",
            "v0.5.0-beta4",
            "v0.5.0-beta3",
            "fork-start",
            "v0.4.8",
            "v0.4.3",
            "v0.4.2",
            "v0.4.1",
            "v0.3.9x"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-1000159.json"
          }
        }
      ],
      "modified": "2026-10-20T10:49:46.102066201Z",
      "provider": "osv",
      "references": [
        "https://github.com/tomato42/tlslite-ng/pull/234"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-1000159",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 380783,
  "published_at": "2018-04-18T19:29:00.333+00:00"
}