USN-8516-1 (UBUNTU-CVE-2026-29167)

Vulnerability from osv_ubuntu – Published: 2026-07-08 13:49 – Updated: 2026-07-08 13:49 – Source website
VLAI
Summary
apache2 vulnerabilities
Details

It was discovered that Apache HTTP Server's mod_ldap module incorrectly handled memory when processing per-directory configurations. An attacker could use this issue to cause the server to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-29167)

It was discovered that Apache HTTP Server's mod_proxy_ftp module incorrectly handled HTML generation for FTP directory listings. A remote attacker could possibly use this issue to inject arbitrary web script or HTML. (CVE-2026-29170)

It was discovered that Apache HTTP Server's mod_proxy_html module incorrectly handled certain content from an untrusted backend. A remote attacker could possibly use this issue to cause Apache HTTP Server to crash, resulting in a denial of service. (CVE-2026-34355)

It was discovered that Apache HTTP Server incorrectly handled ProxyPassReverseCookie directives with a malicious backend server. A remote attacker could possibly use this issue to cause Apache HTTP Server to crash, resulting in a denial of service. (CVE-2026-34356)

It was discovered that Apache HTTP Server's mod_dav_fs module incorrectly handled certain path operations. An authenticated user could possibly use this issue to manipulate trusted WebDAV property databases or cause a denial of service. (CVE-2026-42535)

It was discovered that Apache HTTP Server's mod_xml2enc module incorrectly handled certain content from an untrusted backend. A remote attacker could possibly use this issue to cause Apache HTTP Server to crash, resulting in a denial of service. (CVE-2026-42536)

It was discovered that Apache HTTP Server incorrectly handled response headers when multiple content languages were configured. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-43951)

It was discovered that Apache HTTP Server incorrectly restricted certain file functions in expressions within .htaccess files. A local attacker with .htaccess write access could possibly use this issue to obtain sensitive information. (CVE-2026-44119)

It was discovered that Apache HTTP Server's mod_ssl module incorrectly handled OCSP responses from an attacker-controlled server. A remote attacker could possibly use this issue to obtain sensitive information or cause a denial of service. (CVE-2026-44185)

It was discovered that Apache HTTP Server's mod_proxy_ftp module incorrectly handled responses from an attacker-controlled backend FTP server. A remote attacker could possibly use this issue to cause Apache HTTP Server to stop responding, resulting in a denial of service. (CVE-2026-44186)

It was discovered that Apache HTTP Server incorrectly handled crafted regular expressions in the server configuration. An attacker could possibly use this issue to execute arbitrary code or cause a denial of service. (CVE-2026-44631)

It was discovered that Apache HTTP Server's mod_http2 module had a use-after-free vulnerability when file handles were exhausted. A remote attacker could possibly use this issue to cause Apache HTTP Server to crash, resulting in a denial of service. (CVE-2026-48913)

References
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{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-29167",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
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              "id": "CVE-2026-44631",
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                  "type": "Ubuntu"
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              "id": "CVE-2026-29170",
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                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
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              "id": "CVE-2026-34355",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
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                },
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              "id": "CVE-2026-34356",
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                },
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                },
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                  "score": "medium",
                  "type": "Ubuntu"
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              "id": "CVE-2026-42536",
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                  "score": "medium",
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              "id": "CVE-2026-43951",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
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                  "score": "medium",
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                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
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              "id": "CVE-2026-44631",
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                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-48913",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
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          ],
          "ecosystem": "Ubuntu:24.04:LTS"
        }
      },
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    },
    {
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                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
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              ]
            },
            {
              "id": "CVE-2026-29170",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-34355",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-34356",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-42535",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-42536",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-43951",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
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                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44119",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44185",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44186",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44631",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-48913",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:26.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
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            "binary_name": "apache2",
            "binary_version": "2.4.66-2ubuntu2.4"
          },
          {
            "binary_name": "apache2-bin",
            "binary_version": "2.4.66-2ubuntu2.4"
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          {
            "binary_name": "apache2-data",
            "binary_version": "2.4.66-2ubuntu2.4"
          },
          {
            "binary_name": "apache2-suexec-custom",
            "binary_version": "2.4.66-2ubuntu2.4"
          },
          {
            "binary_name": "apache2-suexec-pristine",
            "binary_version": "2.4.66-2ubuntu2.4"
          },
          {
            "binary_name": "apache2-utils",
            "binary_version": "2.4.66-2ubuntu2.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "apache2",
        "purl": "pkg:deb/ubuntu/apache2@2.4.66-2ubuntu2.4?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.4.66-2ubuntu2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "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"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that Apache HTTP Server\u0027s mod_ldap module incorrectly\nhandled memory when processing per-directory configurations. An attacker\ncould use this issue to cause the server to crash, resulting in a denial of\nservice, or possibly execute arbitrary code. (CVE-2026-29167)\n\nIt was discovered that Apache HTTP Server\u0027s mod_proxy_ftp module\nincorrectly handled HTML generation for FTP directory listings. A remote\nattacker could possibly use this issue to inject arbitrary web script or\nHTML. (CVE-2026-29170)\n\nIt was discovered that Apache HTTP Server\u0027s mod_proxy_html module\nincorrectly handled certain content from an untrusted backend. A remote\nattacker could possibly use this issue to cause Apache HTTP Server to\ncrash, resulting in a denial of service. (CVE-2026-34355)\n\nIt was discovered that Apache HTTP Server incorrectly handled\nProxyPassReverseCookie directives with a malicious backend server. A remote\nattacker could possibly use this issue to cause Apache HTTP Server to\ncrash, resulting in a denial of service. (CVE-2026-34356)\n\nIt was discovered that Apache HTTP Server\u0027s mod_dav_fs module incorrectly\nhandled certain path operations. An authenticated user could possibly use\nthis issue to manipulate trusted WebDAV property databases or cause a\ndenial of service. (CVE-2026-42535)\n\nIt was discovered that Apache HTTP Server\u0027s mod_xml2enc module incorrectly\nhandled certain content from an untrusted backend. A remote attacker could\npossibly use this issue to cause Apache HTTP Server to crash, resulting in\na denial of service. (CVE-2026-42536)\n\nIt was discovered that Apache HTTP Server incorrectly handled response\nheaders when multiple content languages were configured. A remote attacker\ncould possibly use this issue to obtain sensitive information.\n(CVE-2026-43951)\n\nIt was discovered that Apache HTTP Server incorrectly restricted certain\nfile functions in expressions within .htaccess files. A local attacker with\n.htaccess write access could possibly use this issue to obtain sensitive\ninformation. (CVE-2026-44119)\n\nIt was discovered that Apache HTTP Server\u0027s mod_ssl module incorrectly\nhandled OCSP responses from an attacker-controlled server. A remote\nattacker could possibly use this issue to obtain sensitive information or\ncause a denial of service. (CVE-2026-44185)\n\nIt was discovered that Apache HTTP Server\u0027s mod_proxy_ftp module\nincorrectly handled responses from an attacker-controlled backend FTP\nserver. A remote attacker could possibly use this issue to cause Apache\nHTTP Server to stop responding, resulting in a denial of service.\n(CVE-2026-44186)\n\nIt was discovered that Apache HTTP Server incorrectly handled crafted\nregular expressions in the server configuration. An attacker could possibly\nuse this issue to execute arbitrary code or cause a denial of service.\n(CVE-2026-44631)\n\nIt was discovered that Apache HTTP Server\u0027s mod_http2 module had a\nuse-after-free vulnerability when file handles were exhausted. A remote\nattacker could possibly use this issue to cause Apache HTTP Server to\ncrash, resulting in a denial of service. (CVE-2026-48913)",
  "id": "USN-8516-1",
  "modified": "2026-07-08T13:49:49Z",
  "published": "2026-07-08T13:49:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8516-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-29167"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-29170"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-34355"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-34356"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-42535"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-42536"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43951"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-44119"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-44185"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-44186"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-44631"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-48913"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "apache2 vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-29167",
    "UBUNTU-CVE-2026-29170",
    "UBUNTU-CVE-2026-34355",
    "UBUNTU-CVE-2026-34356",
    "UBUNTU-CVE-2026-42535",
    "UBUNTU-CVE-2026-42536",
    "UBUNTU-CVE-2026-43951",
    "UBUNTU-CVE-2026-44119",
    "UBUNTU-CVE-2026-44185",
    "UBUNTU-CVE-2026-44186",
    "UBUNTU-CVE-2026-44631",
    "UBUNTU-CVE-2026-48913"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.