{"id":"UBUNTU-CVE-2026-53499","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.","modified":"2026-09-02T19:36:20.077242989Z","published":"2026-08-21T23:16:00Z","upstream":["CVE-2026-53499"],"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"}],"affected":[{"package":{"name":"fort-validator","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/fort-validator?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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_version":"1.2.0-1ubuntu0.1~esm1","binary_name":"fort-validator"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53499.json"}},{"package":{"name":"fort-validator","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/fort-validator?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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":"1.5.3-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53499.json"}},{"package":{"name":"fort-validator","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/fort-validator?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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_version":"1.6.1-1ubuntu0.1~esm2","binary_name":"fort-validator"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53499.json"}},{"package":{"name":"fort-validator","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/fort-validator?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.6-1build1","1.6.7-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.6.7-1","binary_name":"fort-validator"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53499.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","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":"Ubuntu","score":"medium"}]}