{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "ModSecurity",
          "vendor": "owasp-modsecurity",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.9.15"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.0.0, \u003c 3.0.17"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Prior to 2.9.15 and 3.0.17, msre_fn_removeComments_execute in apache2/re_tfns.c and inplace() in src/actions/transformations/remove_comments.cc implement t:removeComments by copying the character immediately after a comment terminator without re-evaluating it. Adjacent comments can therefore leave a later comment in the transformed value, allowing inline-comment obfuscation to bypass rules that depend on comment stripping. When a comment terminator is the final content, the same copy reads one byte beyond the input buffer. This issue is fixed in versions 2.9.15 and 3.0.17."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-670",
              "description": "CWE-670: Always-Incorrect Control Flow Implementation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-09T21:37:00.048Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-qrch-pjfr-9g47",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-qrch-pjfr-9g47"
        },
        {
          "name": "https://github.com/owasp-modsecurity/ModSecurity/commit/264f348ae1823cb71cead3650b74c165678a1d46",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/owasp-modsecurity/ModSecurity/commit/264f348ae1823cb71cead3650b74c165678a1d46"
        },
        {
          "name": "https://github.com/owasp-modsecurity/ModSecurity/commit/49a65f471d3130b91f7fff9bfac9fe8dd9b97c44",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/owasp-modsecurity/ModSecurity/commit/49a65f471d3130b91f7fff9bfac9fe8dd9b97c44"
        },
        {
          "name": "https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v2.9.15",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v2.9.15"
        },
        {
          "name": "https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.17",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.17"
        }
      ],
      "source": {
        "advisory": "GHSA-qrch-pjfr-9g47",
        "discovery": "UNKNOWN"
      },
      "title": "ModSecurity: removeComments Transformation Fails to Strip Adjacent Comments, Enabling WAF Rule Bypass"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-104259",
    "datePublished": "2026-11-09T21:37:00.048Z",
    "dateReserved": "2026-10-01T19:04:39.706Z",
    "dateUpdated": "2026-11-09T21:37:00.048Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}