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DEBIAN-CVE-2026-30923

Type: advisorySource: OSV1 source record

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Libmodsecurity is one component of the ModSecurity v3 project. A segmentation fault occurs when a rule using the t:hexDecode transformation inspects a query string parameter containing a single character. An attacker can exploit this to crash worker processes, causing a denial of service. Service resumes once the attack stops as worker processes recover from the segfault. All versions before 3.0.15 of libModSecurity3 are affected. This has been patched in version 3.0.15.

Announced Group revision 1
Original source ↗

DEBIAN-CVE-2026-30923

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-30923

modsecurity

Source reference: /affected/0/package/name

Affected versions
3.0.9-1

Source reference: /affected/0/versions

3.0.9-1+deb12u1

Source reference: /affected/0/versions

Fixed versions
3.0.9-1+deb12u2

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

modsecurity

Source reference: /affected/1/package/name

Affected versions
3.0.14-1

Source reference: /affected/1/versions

Fixed versions
3.0.14-1+deb13u1

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

modsecurity

Source reference: /affected/2/package/name

Affected versions
3.0.14-1

Source reference: /affected/2/versions

Fixed versions
3.0.15-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.0.9-1+deb12u2"
          }
        ]
      }
    ],
    "package": {
      "name": "modsecurity",
      "purl": "pkg:deb/debian/modsecurity?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "3.0.9-1",
      "3.0.9-1+deb12u1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-30923.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.0.14-1+deb13u1"
          }
        ]
      }
    ],
    "package": {
      "name": "modsecurity",
      "purl": "pkg:deb/debian/modsecurity?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "3.0.14-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-30923.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.0.15-1"
          }
        ]
      }
    ],
    "package": {
      "name": "modsecurity",
      "purl": "pkg:deb/debian/modsecurity?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "3.0.14-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-30923.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#55918 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. DEBIAN-CVE-2026-30923 · Revision 1Source updated