{"id":"CVE-2026-75625","aliases":["EUVD-2026-61139","GHSA-xpm6-xhxf-22h5","UBUNTU-CVE-2026-75625"],"status":"published","title":"Kraken Agents Peer-to-Peer Download Cache Poisoning via Digest Verification Bypass","description":"Kraken agents fail to verify peer-to-peer downloaded blobs against their requested SHA-256 digest before committing to the content-addressable cache, relying only on CRC32 checksums for piece validation. Attackers on the agent-to-agent path or malicious peers can supply substituted content with forged CRC32 corrections that passes per-piece checks, poisoning the cache with attacker-chosen container image layers or manifests that are re-seeded and executed by other hosts.","severity":{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00241,"percentile":0.15404,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-354"],"published":"2026-08-18T17:56:54Z","modified":"2026-10-28T02:30:29Z","affected":[{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"kraken","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.5~beta-1","0.10.5~beta-2"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"kraken","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.5~beta-5","0.10.5~beta-6","1.1-2"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"kraken","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.1-1","1.1.1-1build1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"kraken","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.1-2","1.1.1-3"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"kraken","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.1-4"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"kraken","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.1-4build1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"kraken","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.1-4","1.1.1-4build1"]}],"products":[{"vendor":"uber","product":"kraken"}],"references":[{"url":"https://github.com/uber/kraken/issues/638","tags":["issue-tracking","exploit","report"]},{"url":"https://github.com/uber/kraken","tags":["product","package"]},{"url":"https://github.com/uber/kraken/blob/master/lib/torrent/storage/agentstorage/torrent.go","tags":["technical-description","article"]},{"url":"https://www.vulncheck.com/advisories/kraken-agents-peer-to-peer-download-cache-poisoning-via-digest-verification-bypass","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-75625","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-xpm6-xhxf-22h5"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75625.json","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-75625","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-75625","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-75625","title":"Kraken Agents Peer-to-Peer Download Cache Poisoning via Digest Verification Bypass","description":"Kraken agents fail to verify peer-to-peer downloaded blobs against their requested SHA-256 digest before committing to the content-addressable cache, relying only on CRC32 checksums for piece validation. Attackers on the agent-to-agent path or malicious peers can supply substituted content with forged CRC32 corrections that passes per-piece checks, poisoning the cache with attacker-chosen container image layers or manifests that are re-seeded and executed by other hosts.","status":"published","published":"2026-08-18T17:56:54.292Z","modified":"2026-09-24T14:19:28.684Z","cvss":[{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H","level":"critical","assessor":"cna"},{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-354"],"updated_at":"2026-11-02T14:20:07.260654Z"}],"euvd":[{"id":"EUVD-2026-61139","description":"Kraken agents fail to verify peer-to-peer downloaded blobs against their requested SHA-256 digest before committing to the content-addressable cache, relying only on CRC32 checksums for piece validation. Attackers on the agent-to-agent path or malicious peers can supply substituted content with forged CRC32 corrections that passes per-piece checks, poisoning the cache with attacker-chosen container image layers or manifests that are re-seeded and executed by other hosts.","status":"published","published":"2026-08-18T17:56:54Z","modified":"2026-09-24T14:19:28Z","cvss":[{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H","level":"critical"}],"updated_at":"2026-11-02T17:27:57.839356Z"}],"ghsa":[{"id":"GHSA-xpm6-xhxf-22h5","title":"Kraken agents fail to verify peer-to-peer downloaded blobs against their requested SHA-256 digest...","description":"Kraken agents fail to verify peer-to-peer downloaded blobs against their requested SHA-256 digest before committing to the content-addressable cache, relying only on CRC32 checksums for piece validation. Attackers on the agent-to-agent path or malicious peers can supply substituted content with forged CRC32 corrections that passes per-piece checks, poisoning the cache with attacker-chosen container image layers or manifests that are re-seeded and executed by other hosts.","status":"published","published":"2026-08-18T18:32:04Z","modified":"2026-08-18T18:32:10Z","cvss":[{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical"},{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-354"],"updated_at":"2026-11-02T15:10:37.069016Z"}],"nvd":[{"id":"CVE-2026-75625","description":"Kraken agents fail to verify peer-to-peer downloaded blobs against their requested SHA-256 digest before committing to the content-addressable cache, relying only on CRC32 checksums for piece validation. Attackers on the agent-to-agent path or malicious peers can supply substituted content with forged CRC32 corrections that passes per-piece checks, poisoning the cache with attacker-chosen container image layers or manifests that are re-seeded and executed by other hosts.","status":"published","published":"2026-08-18T18:19:34.343Z","modified":"2026-10-22T22:10:00.25Z","cvss":[{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical","assessor":"secondary"},{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-354"],"updated_at":"2026-11-02T14:12:38.976695Z"}],"osv":[{"id":"CVE-2026-75625","title":"Kraken Agents Peer-to-Peer Download Cache Poisoning via Digest Verification Bypass","description":"Kraken agents fail to verify peer-to-peer downloaded blobs against their requested SHA-256 digest before committing to the content-addressable cache, relying only on CRC32 checksums for piece validation. Attackers on the agent-to-agent path or malicious peers can supply substituted content with forged CRC32 corrections that passes per-piece checks, poisoning the cache with attacker-chosen container image layers or manifests that are re-seeded and executed by other hosts.","status":"published","published":"2026-08-18T17:56:54.292Z","modified":"2026-10-28T02:30:29.727653716Z","cvss":[{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H","level":"critical"}],"cwes":["CWE-354"],"updated_at":"2026-11-02T15:45:17.102988Z"},{"id":"UBUNTU-CVE-2026-75625","description":"Kraken agents fail to verify peer-to-peer downloaded blobs against their requested SHA-256 digest before committing to the content-addressable cache, relying only on CRC32 checksums for piece validation. Attackers on the agent-to-agent path or malicious peers can supply substituted content with forged CRC32 corrections that passes per-piece checks, poisoning the cache with attacker-chosen container image layers or manifests that are re-seeded and executed by other hosts.","status":"published","published":"2026-08-18T18:19:00Z","modified":"2026-10-17T13:01:05.627568231Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical"},{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H","level":"critical"}],"updated_at":"2026-11-02T16:57:13.483205Z"}]}}