Vulnerability-Lookup

ubuntu-cve-2026-53499

Vulnerability from osv_ubuntu

Published

2026-08-21 23:16

Modified

2026-09-02 16:20

Summary

Details

FORT Validator is a Resource Public Key Infrastructure (RPKI) relying-party validator that produces validated route-origin data. FORT Validator versions through 1.6.7 contain an origin-validation error in their RRDP processing: a delegated CA under the same Trust Anchor Locator (TAL) can reference a victim CA’s public RRDP notification and snapshot URLs, causing FORT’s URL-based download cache to report success after deleting the victim’s local snapshot. Following a routine victim publication, this can silently remove the victim’s VRPs and other signed objects from FORT’s output, potentially enabling route hijacking or loss of reachability. Version 1.6.8 contains a patch that rejects cross-origin RRDP snapshot and delta URLs; as a workaround, administrators can disable HTTP/RRDP with --http.enabled=false while keeping rsync enabled, although this can leave data unavailable or stale where rsync is not supported.

Severity

7.2 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-53499	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-53499	REPORT
	https://github.com/NICMx/FORT-validator/security/…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "fort-validator",
            "binary_version": "1.2.0-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "fort-validator",
        "purl": "pkg:deb/ubuntu/fort-validator@1.2.0-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.1-2",
        "1.1.2-1",
        "1.1.3-1",
        "1.2.0-1",
        "1.2.0-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "fort-validator",
            "binary_version": "1.5.3-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "fort-validator",
        "purl": "pkg:deb/ubuntu/fort-validator@1.5.3-1ubuntu0.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.1-1",
        "1.5.2-1",
        "1.5.3-1",
        "1.5.3-1build1",
        "1.5.3-1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "fort-validator",
            "binary_version": "1.6.1-1ubuntu0.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "fort-validator",
        "purl": "pkg:deb/ubuntu/fort-validator@1.6.1-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.4-1",
        "1.6.1-1",
        "1.6.1-1build2",
        "1.6.1-1build3",
        "1.6.1-1ubuntu0.1~esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "fort-validator",
            "binary_version": "1.6.7-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "fort-validator",
        "purl": "pkg:deb/ubuntu/fort-validator@1.6.7-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.6-1build1",
        "1.6.7-1"
      ]
    }
  ],
  "aliases": [],
  "details": "FORT Validator is a Resource Public Key Infrastructure (RPKI) relying-party validator that produces validated route-origin data. FORT Validator versions through 1.6.7 contain an origin-validation error in their RRDP processing: a delegated CA under the same Trust Anchor Locator (TAL) can reference a victim CA\u2019s public RRDP notification and snapshot URLs, causing FORT\u2019s URL-based download cache to report success after deleting the victim\u2019s local snapshot. Following a routine victim publication, this can silently remove the victim\u2019s VRPs and other signed objects from FORT\u2019s output, potentially enabling route hijacking or loss of reachability. Version 1.6.8 contains a patch that rejects cross-origin RRDP snapshot and delta URLs; as a workaround, administrators can disable HTTP/RRDP with \u00a0--http.enabled=false\u00a0 while keeping rsync enabled, although this can leave data unavailable or stale where rsync is not supported.",
  "id": "UBUNTU-CVE-2026-53499",
  "modified": "2026-09-02T16:20:00Z",
  "published": "2026-08-21T23:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-53499"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53499"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/NICMx/FORT-validator/security/advisories/GHSA-qfm3-577x-rh54"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:H",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-53499"
  ]
}

CVE-2026-53499 (GCVE-0-2026-53499)

Vulnerability from cvelistv5 – Published: 2026-08-21 22:29 – Updated: 2026-08-25 19:24

Title

FORT-validator Vulnerable to RRDP Shared Snapshot Cache Poisoning

Summary

Severity

7.2 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-25 18:32 UTC

CWE

CWE-346 - Origin Validation Error

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/NICMx/FORT-validator/security/…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
NICMx	FORT-validator	Affected: < 1.6.8

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-53499",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-25T18:32:25.695778Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-25T19:24:28.228Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "FORT-validator",
          "vendor": "NICMx",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.6.8"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "FORT Validator is a Resource Public Key Infrastructure (RPKI) relying-party validator that produces validated route-origin data. FORT Validator versions through 1.6.7 contain an origin-validation error in their RRDP processing: a delegated CA under the same Trust Anchor Locator (TAL) can reference a victim CA\u2019s public RRDP notification and snapshot URLs, causing FORT\u2019s URL-based download cache to report success after deleting the victim\u2019s local snapshot. Following a routine victim publication, this can silently remove the victim\u2019s VRPs and other signed objects from FORT\u2019s output, potentially enabling route hijacking or loss of reachability. Version 1.6.8 contains a patch that rejects cross-origin RRDP snapshot and delta URLs; as a workaround, administrators can disable HTTP/RRDP with \u00a0--http.enabled=false\u00a0 while keeping rsync enabled, although this can leave data unavailable or stale where rsync is not supported."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 7.2,
            "baseSeverity": "HIGH",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:H",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-346",
              "description": "CWE-346: Origin Validation Error",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-21T22:29:48.970Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/NICMx/FORT-validator/security/advisories/GHSA-qfm3-577x-rh54",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/NICMx/FORT-validator/security/advisories/GHSA-qfm3-577x-rh54"
        }
      ],
      "source": {
        "advisory": "GHSA-qfm3-577x-rh54",
        "discovery": "UNKNOWN"
      },
      "title": "FORT-validator Vulnerable to RRDP Shared Snapshot Cache Poisoning"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-53499",
    "datePublished": "2026-08-21T22:29:48.970Z",
    "dateReserved": "2026-06-09T17:05:25.059Z",
    "dateUpdated": "2026-08-25T19:24:28.228Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.