CVE catalog

CVE-2026-56154

Use After Free vulnerability in Apache HTTP Server's…

Use After Free vulnerability in Apache HTTP Server's mod_rewrite when using lookahead (%{LA-U:HTTP:...}) This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

Severity: Critical · CVSS 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: Oct 1, 2026, 4:03:52 PM UTC
Updated: Oct 1, 2026, 5:17:26 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.54% · Oct 27, 2026

Projects and upstream resources

[apache2][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence

Original provider fields

{
  "package_releases": [
    {
      "name": "apache2",
      "status": "fixed",
      "release": "sid",
      "version": "2.4.69-1"
    },
    {
      "name": "apache2",
      "status": "fixed",
      "release": "forky",
      "version": "2.4.69-1"
    },
    {
      "name": "apache2",
      "status": "vulnerable",
      "release": "trixie",
      "version": "2.4.68-1~deb13u1"
    },
    {
      "name": "apache2",
      "status": "fixed",
      "release": "trixie-security",
      "version": "2.4.69-1~deb13u1"
    },
    {
      "name": "apache2",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "2.4.68-1~deb12u1"
    },
    {
      "name": "apache2",
      "status": "vulnerable",
      "release": "bookworm-security",
      "version": "2.4.67-1~deb12u3"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "apache2",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "2.4.69-1"
    },
    {
      "bug": null,
      "name": "apache2",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "2.4.69-1"
    },
    {
      "bug": null,
      "name": "apache2",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "2.4.69-1~deb13u1"
    },
    {
      "bug": null,
      "name": "apache2",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "http_server",
      "ranges": [
        {
          "fixed": "2.4.69",
          "introduced": "2.4.0",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "2.4.69",
      "provider_record_id": "NVD-CVE-2026-56154"
    },
    {
      "name": "apache2",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "2.4.58-1ubuntu8.16",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.4.58-1ubuntu8.16"
    },
    {
      "name": "apache2-bin",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "2.4.58-1ubuntu8.16",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.4.58-1ubuntu8.16"
    },
    {
      "name": "apache2-data",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "2.4.58-1ubuntu8.16",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.4.58-1ubuntu8.16"
    },
    {
      "name": "apache2-dev",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "2.4.58-1ubuntu8.16",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.4.58-1ubuntu8.16"
    },
    {
      "name": "apache2-doc",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "2.4.58-1ubuntu8.16",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.4.58-1ubuntu8.16"
    },
    {
      "name": "apache2-ssl-dev",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "2.4.58-1ubuntu8.16",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.4.58-1ubuntu8.16"
    },
    {
      "name": "apache2-suexec-custom",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "2.4.58-1ubuntu8.16",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.4.58-1ubuntu8.16"
    },
    {
      "name": "apache2-suexec-pristine",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "2.4.58-1ubuntu8.16",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.4.58-1ubuntu8.16"
    },
    {
      "name": "apache2-utils",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "2.4.58-1ubuntu8.16",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.4.58-1ubuntu8.16"
    },
    {
      "name": "libapache2-mod-md",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "2.4.58-1ubuntu8.16",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.4.58-1ubuntu8.16"
    },
    {
      "name": "libapache2-mod-proxy-uwsgi",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "2.4.58-1ubuntu8.16",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.4.58-1ubuntu8.16"
    },
    {
      "name": "apache2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.4.41-4ubuntu3.23+esm8"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "2.4.41-1ubuntu1",
        "2.4.41-4ubuntu1",
        "2.4.41-4ubuntu2",
        "2.4.41-4ubuntu3",
        "2.4.41-4ubuntu3.1",
        "2.4.41-4ubuntu3.3",
        "2.4.41-4ubuntu3.4",
        "2.4.41-4ubuntu3.5",
        "2.4.41-4ubuntu3.6",
        "2.4.41-4ubuntu3.7",
        "2.4.41-4ubuntu3.8",
        "2.4.41-4ubuntu3.9",
        "2.4.41-4ubuntu3.10",
        "2.4.41-4ubuntu3.11",
        "2.4.41-4ubuntu3.12",
        "2.4.41-4ubuntu3.13",
        "2.4.41-4ubuntu3.14",
        "2.4.41-4ubuntu3.15",
        "2.4.41-4ubuntu3.16",
        "2.4.41-4ubuntu3.17",
        "2.4.41-4ubuntu3.19",
        "2.4.41-4ubuntu3.20",
        "2.4.41-4ubuntu3.21",
        "2.4.41-4ubuntu3.23",
        "2.4.41-4ubuntu3.23+esm2",
        "2.4.41-4ubuntu3.23+esm3",
        "2.4.41-4ubuntu3.23+esm4",
        "2.4.41-4ubuntu3.23+esm5",
        "2.4.41-4ubuntu3.23+esm6",
        "2.4.41-4ubuntu3.23+esm7"
      ],
      "ecosystem": "deb",
      "fixed_version": "2.4.41-4ubuntu3.23+esm8",
      "provider_record_id": "USN-8898-1"
    },
    {
      "name": "apache2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.4.52-1ubuntu4.24"
            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [
        "2.4.48-3.1ubuntu3",
        "2.4.48-3.1ubuntu4",
        "2.4.51-2ubuntu1",
        "2.4.52-1ubuntu1",
        "2.4.52-1ubuntu2",
        "2.4.52-1ubuntu4",
        "2.4.52-1ubuntu4.1",
        "2.4.52-1ubuntu4.2",
        "2.4.52-1ubuntu4.3",
        "2.4.52-1ubuntu4.4",
        "2.4.52-1ubuntu4.5",
        "2.4.52-1ubuntu4.6",
        "2.4.52-1ubuntu4.7",
        "2.4.52-1ubuntu4.8",
        "2.4.52-1ubuntu4.9",
        "2.4.52-1ubuntu4.10",
        "2.4.52-1ubuntu4.11",
        "2.4.52-1ubuntu4.12",
        "2.4.52-1ubuntu4.13",
        "2.4.52-1ubuntu4.14",
        "2.4.52-1ubuntu4.15",
        "2.4.52-1ubuntu4.16",
        "2.4.52-1ubuntu4.18",
        "2.4.52-1ubuntu4.19",
        "2.4.52-1ubuntu4.20",
        "2.4.52-1ubuntu4.21",
        "2.4.52-1ubuntu4.23"
      ],
      "ecosystem": "deb",
      "fixed_version": "2.4.52-1ubuntu4.24",
      "provider_record_id": "USN-8898-1"
    },
    {
      "name": "apache2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.4.58-1ubuntu8.16"
            }
          ]
        }
      ],
      "release": "24.04",
      "versions": [
        "2.4.57-2ubuntu2",
        "2.4.57-2ubuntu3",
        "2.4.58-1ubuntu1",
        "2.4.58-1ubuntu2",
        "2.4.58-1ubuntu6",
        "2.4.58-1ubuntu7",
        "2.4.58-1ubuntu8",
        "2.4.58-1ubuntu8.1",
        "2.4.58-1ubuntu8.2",
        "2.4.58-1ubuntu8.3",
        "2.4.58-1ubuntu8.4",
        "2.4.58-1ubuntu8.5",
        "2.4.58-1ubuntu8.6",
        "2.4.58-1ubuntu8.7",
        "2.4.58-1ubuntu8.8",
        "2.4.58-1ubuntu8.10",
        "2.4.58-1ubuntu8.11",
        "2.4.58-1ubuntu8.12",
        "2.4.58-1ubuntu8.13",
        "2.4.58-1ubuntu8.15"
      ],
      "ecosystem": "deb",
      "fixed_version": "2.4.58-1ubuntu8.16",
      "provider_record_id": "USN-8898-1"
    },
    {
      "name": "apache2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.4.66-2ubuntu2.5"
            }
          ]
        }
      ],
      "release": "26.04",
      "versions": [
        "2.4.64-1ubuntu3",
        "2.4.65-3ubuntu1",
        "2.4.66-2ubuntu1",
        "2.4.66-2ubuntu2",
        "2.4.66-2ubuntu2.1",
        "2.4.66-2ubuntu2.2",
        "2.4.66-2ubuntu2.4"
      ],
      "ecosystem": "deb",
      "fixed_version": "2.4.66-2ubuntu2.5",
      "provider_record_id": "USN-8898-1"
    },
    {
      "name": "apache2",
      "distro": "alpine",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.4.69-r0"
            }
          ]
        }
      ],
      "release": "3.21",
      "versions": [],
      "ecosystem": "apk",
      "fixed_version": "2.4.69-r0",
      "provider_record_id": "ALPINE-CVE-2026-56154"
    },
    {
      "name": "apache2",
      "distro": "alpine",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.4.69-r0"
            }
          ]
        }
      ],
      "release": "3.22",
      "versions": [],
      "ecosystem": "apk",
      "fixed_version": "2.4.69-r0",
      "provider_record_id": "ALPINE-CVE-2026-56154"
    },
    {
      "name": "apache2",
      "distro": "alpine",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.4.69-r0"
            }
          ]
        }
      ],
      "release": "3.23",
      "versions": [],
      "ecosystem": "apk",
      "fixed_version": "2.4.69-r0",
      "provider_record_id": "ALPINE-CVE-2026-56154"
    },
    {
      "name": "apache2",
      "distro": "alpine",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.4.69-r0"
            }
          ]
        }
      ],
      "release": "3.24",
      "versions": [],
      "ecosystem": "apk",
      "fixed_version": "2.4.69-r0",
      "provider_record_id": "ALPINE-CVE-2026-56154"
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[apache2]Unknown
Details (4)
- 2.4.68-1~deb12u1 · amd64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · arm64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · amd64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · arm64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[apache2-bin]Unknown
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · amd64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · arm64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · amd64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · arm64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[apache2-data]Unknown
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · all · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · all · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · all · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · all · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[apache2-dev]Unknown
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · amd64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · arm64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · amd64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · arm64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[apache2-doc]Unknown
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · all · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · all · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · all · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · all · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[apache2-ssl-dev]Unknown
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · amd64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · arm64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · amd64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · arm64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[apache2-suexec-custom]Unknown
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · amd64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · arm64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · amd64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · arm64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[apache2-suexec-pristine]Unknown
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · amd64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · arm64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · amd64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · arm64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[apache2-utils]Unknown
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · amd64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · arm64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · amd64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · arm64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[libapache2-mod-md]Unknown
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · amd64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · arm64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · amd64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · arm64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[libapache2-mod-proxy-uwsgi]Unknown
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · amd64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · arm64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · amd64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · arm64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm

Observed: Oct 27, 2026, 5:00:07 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]